- Effect of high magnetic field on the fabrication of one-dimensional tellurium microstructures via a solvothermal treatment
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The magnetic-field-assisted solvothermal approach has been used in the shape-controlled growth of Te microcrystals. By applying a high magnetic field to the reaction system, the shape of obtained Te microcrystals could be changed greatly. Various techniques such as X-ray diffraction and scanning electron microscopy have been used to characterize the obtained products. The results show that the magnetic field plays a key role in the growth behavior of Te microcrystals. The possible cause of magnetic field effects is discussed. Copyright
- Xu, Yongbin,Ren, Zhongming,Cao, Guanghui,Ren, Weili,Deng, Kang,Zhong, Yunbo
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- Mechanism of film growth of tellurium by electrochemical deposition in the presence and absence of cadmium ions
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The growth morphology and the kinetics of a thin film of Te on Au during electrochemical deposition at -62 mV (vs Ag/AgCl/3 M NaCl) have been studied. The deposition conditions are similar to those used previously by us to grow nanowires inside Au nanotubes by electrochemical deposition in the presence of Cd ions (Cd2+). By using electrochemical deposition on a planar Au electrode, we explored the growth of the Te film for two conditions: in the presence of Cd2+ (0.1 mM TeO2 + 1 mM CdSO4 + 50 mM H2SO4 solution) and in the absence of Cd2+ (0.1 mM TeO2 + 50 mM H2SO4 solution). We used several surface investigation techniques to study the growth such as: in situ electrochemical atomic force microscopy (EC-AFM), in situ electrochemical surface plasmon resonance (EC-SPR), electrochemical methods, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). In the presence of Cd2+, in situ electrochemical atomic microscopy showed that Cd 2+ acted as a mediator at the early deposition stage and caused smoothing of the Te deposit obtained. In the absence of Cd2+, Te had an island growth. The electrochemical surface plasmon resonance showed that the deposit was characterized by a slower deposition rate in the presence of Cd 2+ than in the absence of Cd2+. Additionally, the thickness of the film was evaluated using EC-AFM measurements, electrochemical stripping analysis, and EC-SPR. The results obtained from all three measurements agree well with the Te film obtained in the presence of Cd2+, where a continuous and uniform film was formed. In the presence of Cd2+, a Te film with a thickness of 1.04 nm and atomically flat surface was deposited on an ultraflat Au surface. The XPS spectrum showed no significant amount of Cd in the deposit, indicating that the Cd ion acted as a mediator and not as a co-deposition element.
- Ku, Jie-Ren,Vidu, Ruxandra,Stroeve, Pieter
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- Photoassisted electrodeposition of CdTe layer from ammoniacal basic aqueous solutions
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Potentiostatic cathodic electrodeposition of CdTe on gold substrate under irradiation of visible light was studied using basic aqueous electrolytic baths in which Cd(II) and Te(IV) species were dissolved to form Cd(NH3)42- and TeO32- ions, respectively. Both deposition current density and current efficiency for the CdTe deposition were enhanced by photoirradiation and, as a result, the time required for a given amount of deposition was dramatically shortened. The photoirradiation also resulted in a slight increase in cadmium content of the CdTe deposits and, in some cases, elemental Cd was deposited by underpotential codeposition. The cathodic polarization curve under pulsed photoirradiation showed a photoresponse in cathode current at potentials negative to the Nernst potential of CdTe deposition and the photoresponse was observed for wavelengths lower than that corresponding to the bandgap of CdTe, suggesting that the response was due to the CdTe itself growing on the cathode surface. The mechanism of the photoassist is discussed in terms of photoconduction of low-conducting CdTe semiconductors.
- Murase, Kuniaki,Matsui, Masaki,Miyake, Masao,Hirato, Tetsuji,Awakura, Yasuhiro
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- Microwave-polythiol Method. A New Route to Preparation of Tellurium with Various Morphologies
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A new microwave-polythiol method has been developed for preparation of tellurium (Te) with various morphologies. 1,2-Ethanedithiol (EDT) was used as both a reducing reagent and a solvent. Reduction of TeO2 by EDT was achieved by microwave-heating at ≤140°C for 30 min. The morphology of Te could be controlled by changing experimental parameters.
- Zhu, Ying-Jie,Hu, Xian-Luo
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- Synthesis and Crystal Structure of Tellurium(II) bis(2- methoxycarbonylethanethiolate): A Novel Coordination Mode of Tellurium
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The tellurium(II) dithiolates Te[SCH2CH2C(O)OCH3] 2, (1), Te[SCH2CH2CH2SC(O)CH 3]2, (2), and Te[SCH2CH2CH 2CH2- SC(O)CH3]2, (3) were synthesized from Te(StBu)2 and the corresponding thiol. All compounds are sensitive toward higher temperatures and light and decompose to elemental tellurium and the disulfide. In the solid state, the Te atom of 1 exhibits the novel Te(S2Te2) coordination mode. Additionally to the two Te-S bonds, each Te atom forms two long Te...Te contacts to neighboring mol-ecules, leading to a coordination number of four and a distorted sawhorse configuration. No intramolecular Te...O interactions are present in the solid state, in accordance with ab initio calculations (MP2/ecp-basis) for the isolated molecule. 125Te NMR shifts of all compounds lay within a narrow range and close to the respective shift of other Te(SCH2R)2 compounds. VT 125Te NMR spectra gave no hint to donor acceptor interactions in solution for any of the compounds and thus corroborate results from IR-spectroscopy, ab initio geometry optimizations, and thermochemical calculations.
- Fleischer, Holger,Hennig, Sandra,Schollmeyer, Dieter
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- Preparation of photocatalytic Au-Ag2Te nanomaterials
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A facile approach has been developed for the preparation of various morphologies of Au-Ag2Te nanomaterials (NMs) that exhibit strong photocatalytic activity. Te NMs (nanowires, nanopencils, and nanorice) were prepared from TeO2 in the presence of various concentrations (16, 8, and 4 M) of a reducing agent (N2H4) at different temperatures (25 and 60 °C). These three Te NMs were then used to prepare Au-Ag2Te NMs by spontaneous redox reactions with Au3+ and Ag+ ions sequentially. The Au-Ag2Te nanopencils exhibit the highest activity toward degradation of methylene blue and formation of active hydroxyl radicals on solar irradiation, mainly because they absorb light in the visible region most strongly. All three differently shaped Au-Ag 2Te NMs (10-μg mL-1) provide a death rate of Escherichia coli greater than 80 % within 60-min, which is higher than that of 51 % for commercial TiO2 nanoparticles (100-μg mL-1). Under light irradiation, the Au NPs in Au-Ag2Te NMs enhance the overall photo-oxidation ability of Ag2Te NMs through faster charge separation because of good contact between Ag2Te and Au segments. With high antibacterial activity and low toxicity toward normal cells, the Au-Ag2Te NMs hold great potential for use as efficient antibacterial agents. Copyright
- Lin, Zong-Hong,Shih, Zih-Yu,Roy, Prathik,Chang, Huan-Tsung
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- Low dimensional materials: Syntheses, structures, and optical properties of Rb2CuTaS4, Rb2CuTaSe4, RbCu 2TaSe4, K3Ag3Ta2Se 8, and Rb3AgTa2Se12
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The new compounds Rb2CuTaS4 (1), Rb 2CuTaSe4 (2), RbCu2TaSe4 (3), K 3Ag3Ta2Se8 (4), and Rb 3AgTa2Se12 (5) have been synthesized by the reactive flux method at 773 or 873 K. Their crystal structures were determined by single crystal X-ray diffraction. Crystal data for 1: space group Fddd, a = 5.598(1), b = 13.512(4), c = 23.854(5) ?, Z = 8; Crystal data for 2: space group Fddd, a = 5.782(1), b = 13.924(3), c = 24.653(5) ?, Z = 8; Crystal data for 3: space group C2cm, a = 5.7218(3), b = 19.2463(13), c = 7.7456(5) ?, Z = 4; Crystal data for 4: space group C2/c, a = 25.1374(19), b = 6.1007(3), c = 14.4030(11) ?, β = 119.703(8), Z = 4; Crystal data for 5: space group P21/n, a = 9.8186(6), b = 13.7462(11), c = 15.7368(9) ?, β = 96.681(7)°, Z = 4. The compounds 1 and 2 are built up of ∞1[CuTaQ4]2- anionic chains which are formed by edge-sharing CuQ4 and TaQ4 tetrahedra. The rubidium cations are located between the chains. Compound 3 consists of ∞2[Cu2TaSe4]- anionic layers separated by rubidium cations. The anionic layers are formed by ∞1[CuTaSe4]2- chains which are connected by CuSe4 tetrahedra that share common edges with the TaSe4 tetrahedra of neighboring chains. In compound 4 ∞1[Ag3Ta2Se8] 3- anionic chains are found which are separated by potassium cations. These chains are formed by successive corner sharing of AgSe4 tetrahedra and edge sharing between AgSe4 and TaSe4 tetrahedra. All three structures are closely related with the sulvanite (Cu 3VS4) structure type. Compound 5 contains a one dimensional ∞1[AgTa2Se12] 3- anionic chain formed by interconnection of AgSe4 tetrahedra and [Ta2Se11] units. In the structure three monoselenide, three diselenide, and one triselenide anions are found. Raman and far-IR spectroscopic data of compounds 1 and 4 were collected and an interpretation is presented.
- Wu, Yuandong,N?ther, Christian,Bensch, Wolfgang
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- Simple synthesis of ultra-long Ag2Te nanowires through solvothermal co-reduction method
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Ultra-long single crystal β-Ag2Te nanowires with the diameter of about 300 nm were fabricated through a solvothermal route in ethylene glycol (EG) system without any template. The long single crystal wires were curves, with high purity, well-crystallized, and dislocation-free and characterized by using X-ray powder diffraction (XRD), Differential scanning calorimetry (DSC) analysis, X-ray photoelectron spectroscope (XPS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and high-resolution transmission microscopy (HRTEM). The detailed topotactic transformation process from particles into single crystal wires was studied. Furthermore, the electrical conductivity and Seebeck coefficient have been systematically studied between 300 and 600 K.
- Xiao, Feng,Chen, Gang,Wang, Qun,Wang, Lin,Pei, Jian,Zhou, Nan
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- Mesostructured assemblies of ultrathin superlong tellurium nanowires and their photoconductivity
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Well-defined periodic mesostructures of hydrophilic ultrathin Te nanowires with aspect ratios of at least 104 can be produced by the Langmuir-Blodgett technique without any extra hydrophobic pretreatment or functionalization. Packing the arrayed nanowire monolayers will allow construction of nanomesh-like mesostructures or more complex multilayered structures composed of ultrathin nanowires on a planar substrate. The well-organized monolayer of Te nanowires with periodic mesostructures can be readily used as a stamp to transfer such mesostructured nanopatterns to other substrates or can be embedded within a polymer matrix. The mesostructures of ultrathin Te nanowire films show reversibly switched photoelectric properties between the lower- and higher-conductivity states when the light is off and on, and the photocurrent is influenced by the light intensity and the number of mesostructured nanowire monolayer films. This method can be extended for fabrication of other mesostructured assemblies of ultrathin nanowires or nanotubes.
- Liu, Jian-Wei,Zhu, Jian-Hua,Zhang, Chuan-Ling,Liang, Hai-Wei,Yu, Shu-Hong
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- Structural changes of amorphous GeTe2 films by annealing (Formation of metastable crystalline GeTe2 films)
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Amorphous GeTe2 films with the thickness ~0.5 μm, prepared by sputtering technique, transform into the crystalline GeTe 2 films with the isomorphic structure to β-cristobalite, cubic SiO2, at Ta(annealing temper
- Fukumoto, Hirofumi,Tsunetomo, Keiji,Imura, Takeshi,Osaka, Yukio
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- Bi and Te thin films synthesized by galvanic displacement from acidic nitric baths
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Bismuth (Bi) and tellurium (Te) thin films were formed by galvanic displacement of different sacrificial iron group thin films [i.e. nickel (Ni), cobalt (Co) and iron (Fe)] where the formation was systematically investigated by monitoring the change of op
- Chang, Chong Hyun,Rheem, Youngwoo,Choa, Yong-Ho,Shin, Dong Hyuk,Park, Deok-Yong,Myung, Nosang V.
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- Large scale synthesis of tellurium nanoribbons in tetraethylene pentamine aqueous solution and the stability of tellurium nanoribbons in ethanol and water
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Superlong single crystal tellurium nanoribbons with a width of 200-300 nm and length up to several-hundred micrometers have been synthesized in tetraethylene pentamine aqueous solution at 80°C. The stability of as prepared tellurium nanoribbons in solvents such as pure ethanol and deionized water has been studied. The poor crytallinity of the initial single crystalline Te nanoribbons with prolonged storing time demonstrated that the initial single crystalline nanobelts tend to be destroyed and to dissolve in the solvent. In meantime, the supersaturation of the solvable Te species in such solvents will result in the formation of amorphous Te, and the formation of amorphous TeO 2 due to partial oxidation of the Te nanostructures and the newly formed amorphous Te. The detailed corrosion process, crystallinity, and shape evolution process have been carefully examined by the XRD, TEM, HRTEM, and XPS techniques. This erosion phenomenon attacked by solvents has been not identified previously, suggesting that tellurium nanoribbons synthesized by other chemical methods could be also not stable in solution system and their storage after laboratory synthesis requires special attention.
- He, Zhubing,Yu, Shu-Hong
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- A rapid route for the synthesis of submicron se and te rod-like crystals
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Submicron Se and Te rod-like crystals were successfully synthesized via a rapid polyol process by refluxing Na2EO3 (E=Se, Te) and (NH3)2S2O3 in ethylene glycol at 180°C for 0.5 h under vigorous stirring. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), and XPS procedures. Studies found that reaction time and temperature have great influences on the morphology of the final products.
- Shen, Guozhen,Chen, Di,Tang, Kaibin,Qian, Yitai
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- In-Situ STM of Te UPD Layers on Low Index Planes of Gold
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The structure of well-ordered atomic layers of underpotentially deposited (UPD) tellurium on Au(110), Au-(100) and Au(111) was studied by in-situ scanning tunneling microscopy (STM).A series of largely commensurate structures is observed, with a close correspondence between coverages obtained from the STM images and the cyclic voltammetry assuming complete discharge of Te(4+) during adsorption.A linear dependence of the UPD peak current and the peak potential with the square root of the scan rate is observed indicating that the adsorption phase transition is associated with a two-dimensional, instantaneous nucleation process .The same structures are observed in sulfuric acid and perchloric acid supporting electrolyte.The first UPD structure formed on Au(111) corresponds to a pseudohexagonal packing of Te (0.42 ML) (ML = monolayer) in a single domain superlattice structure with missing atom defects.The superlattice cell is (3 x 3)R19 deg with respect to the constituent Te atom hexagonal cell and is consistent with the (12 x 12) structure on Au(111) reported previously.The second UPD structure on Au(111) is a pseudo-morphic (1 x 1).The Te-substrate interaction favos site specific adsorption, and dipolar repulsion within low-coverage layers is responsible for the open packing.
- Hayden, Brian E.,Nandhakumar, Iris S.
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- Four birds with one stone : Synthesis of nanostructures of ZnTe, Te, ZnAl2O4, and Te/ZnAl2O4 from a single-source precursor
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Four shape-defined anisotropic nanostructures: Single-crystalline nanowires of ZnTe and elemental tellurium, core-shell structures of the type Te/ZnAl 2O4 (see picture), and nanotubes of zinc spinel ZnAl 2O4 could selectively be produced from [Zn(TePh) 2(tmeda)] (tmeda = N,N,N′,N′-tetramethylethylenediamine) as a single-source precursor. Porous alumina templates with a pore diameter of 25 nm were used both as shape-defining molds and chemical reactants. (Figure Presented).
- Zhao, Lili,Yosef, Maekele,Pippel, Eckhard,Hofmeister, Herbert,Steinhart, Martin,Goesele, Ulrich,Schlecht, Sabine
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- Underpotential deposition of Te monolayers on Au surfaces from perchloric acid solution studied by chronocoulometry and EQCM
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We report a study of the underpotential deposition (UPD) of Te monolayers onto Au electrodes from perchloric acid solution using electrochemical quartz microgravimetry (EQCM) and chronocoulometry. We find that tellurium(IV) oxide (as TeO32
- Nicic, Igor,Liang, Jie,Cammarata, Vince,Alanyalioglu, Murat,Demir, Umit,Shannon, Curtis
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- Strategy of solution process precursors for phase change memory
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In this study, the relationship between the steric hindrance of the alpha carbon substituent group of aminoalkoxy ligand and formation of germanium telluride (GeTe) and antimony telluride (Sb2Te3) was elucidated. A series of germaniu
- Hwang, Jeong Min,Lee, Ji Hun,Kim, Hyo-Suk,Park, Chan Woo,Yoo, Dagyum,Park, Bo Keun,Kim, Chang Gyoun,Chung, Taek-Mo
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- Photolytic preparation of tellurium nanorods
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Well-defined tellurium nanorods have been prepared by the photolysis of tBu2Te2 in an aqueous micellar system incorporating dodecanethiol as an auxiliary morphology-directing agent.
- Webber, David H.,Brutchey, Richard L.
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- Synthesis, structure and selective chlorination of bis(N-borane- dimethylaminopropyl)telluride
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The reaction of Te powder, NaBH4 and Me2N(CH 2)3Cl·HCl provided the title compound [H 3BNMe2-(CH2)3]2Te (1), whose selective chlorination with SO2/sub
- Beckmann, Jens,Fleige, Emanuel,Schnurbusch, Nicolai
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- Electrodeposition of ZnTe Film with High Current Efficiency at Low Overpotential from a Citric Acid Bath
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The cathodic electrodeposition of ZnTe film was studied using an aqueous citric acid bath (pH 4; temperature 368 K) in which Zn(II) and Te(IV) species were dissolved to form Zn(Cit)24- and HTeO 2+ ions, respectively. The deposition mechanism was studied based on cyclic voltammetry. The influence of the deposition potential on the morphology, composition, and structure of the deposited film was also investigated. A smooth, dense polycrystalline ZnTe film with nearly stoichiometric composition was deposited at a constant cathode potential, ranging from -0.80 to -0.60 V vs. Ag/AgCl, from a solution containing 20 mmol dm-3 Zn(II), 0.16 mmol dm-3 Te(IV), 0.25 mol dm -3 H3Cit, and 0.25 mol dm-3 Na3Cit (Cit = C6H5O7). Potentials in this range provided the deposited ZnTe film with high current efficiency (above 98%). During electrodeposition of the nearly stoichiometric crystalline ZnTe, the current density was approximately stationary.
- Ishizaki, Takahiro,Ohtomo, Takeshi,Fuwa, Akio
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- EC-STM studies of Te and CdTe atomic layer formation from a basic Te solution
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The cyclic volitammetry of Te on Au is markedly affected by pH. This fact can be used to advantage when designing an electrodeposition cycle for CdTe. For instance, if a pH 2 Te solution is used, the underpotential deposition (UPD) potential for Te is 0.8 V positive of that for Cd. However, if a pH 9.2 Te deposition solution is used, the potential for Te UPD coincides with that for Cd, greatly simplifying the development of an electrochemical atomic layer epitaxy (EC-ALE) cycle. This report describes electrochemical scanning tunneling microscopy (EC-STM) studies of Te deposition on Au(111) and Au(100) from basic media. Several structures were observed on Au(111): a (6 × 6) tellurite adlayer which spontaneously adsorbed prior to Te formation, a 1/4 coverage (2 × 2)-Te, and a 1/3 coverage (2 × √10)-Te. While on Au(111), a 1/3 coverage (√3 × √3)-Te with (13 × 13) light domain walls, and two (3 × 3)-Te structures, with coverages of 4/9 and 5/9, were observed. Results of the formation of the first CdTe compound monolayer using an EC-ALE cycle which includes Te deposition from a basic solution are also included.
- Lay, Marcus D.,Stickney, John L.
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- One-step fabrication of selenium and tellurium tubular structures
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Single-crystal Se and Te tubular structures have been synthesized in one step by a hydrothermal method and characterized by means of X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected-area electron diffraction (SAED). The hollow prismatic morphology of the tubular structures has been revealed and explained based on the nucleation and growth mechanism of the highly anisotropic crystal structures of Se and Te.
- Qin, Ai-Miao,Fang, Yue-Ping,Su, Cheng-Yong
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- Electrodeposition of Bi-Te alloy films
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Electrochemical deposition of Bi-Te alloy films from acidic solutions containing Bi(NO3)3and TeO2 has been investigated.The thickness, compound, and composition of the Bi-Te alloy films have been examined using stylus-type
- Takahashi,Oda,Ogino,Furuta
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- Lanthanide oxochalcogenido clusters
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Lanthanide chalcogenolates react with either TeO2 in pyridine or py-SO3 in THF to give oxychalcogenido clusters. The sulfido derivatives (THF)8Ln8S2O2(SePh) 16 (Ln = Ce, Nd) are isostructural with previously reported oxoselenido compounds, and must be prepared at low temperatures to avoid the introduction of Se into the sulfide position. Analogous telluride derivatives for the early lanthanides were not obtained, but reactions of in situ prepared Ln(TePh)3 with elemental Te and TeO2 gave a complicated heterocluster product, with tetrametallic polytelluride [(py)7Ln 4(μ4-Te)(μ2-Te2) 2(μ-η2-η2-Te2Te(Ph) Te2)(TePh)] co-crystallizing with the oxotellurido compound [(py)5Ln3(μ3-O)(μ2-Te 2)3(TePh)] (Ln = Ho, Er). An analysis of the thermal decomposition of these compounds did not identify the oxo-containing products, with the sulfide compounds decomposing to give only Ln3Se4 and the telluride compounds forming crystalline LnTe and Te metal. The Royal Society of Chemistry 2010.
- Norton, Kieran,Banerjee, Santanu,Das, Sayantani,Huebner, Louise,Emge, Thomas J.,Brennan, John G.
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- Pt, Pd and Hg Complexes with Potentially Tridentate Telluroether Ligands
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N-[3-(Phenyltellanyl)propyl]picolinamide (HL1) or N-[N″,N″-methyl(phenyl)aminothiocarbonyl]-N′-[3-(phenyltellanyl)propyl]benzamidine (HL2) react with equivalent amounts of PtCl2 or PdCl2 with formation of neutral [MCl(L1-κN,N′,Te)] or [MCl(L2-κS,N,Te)] chelates. A corresponding reaction of HL2 with HgCl2 results in the formation of [HgCl2(HL2-κS,Te)]. Treatment of [PtCl(L1-N,N′,Te)] with elemental iodine results in the exclusive oxidation of the metal ion and the platinum(IV) complex [PtI3(L1-κN,N′,Te)] could be isolated in reasonable amounts. A decomposition of the tellurium-containing ligand and the formation of [PdI2(PhTeI)2] was observed during a similar procedure with the corresponding palladium complex. The bonding situation inside the latter compound was analyzed through density functional theory calculations.
- Kirsten, Lars,Schwade, Vania D.,Selter, Lars,Hagenbach, Adelheid,Piquini, Paulo C.,Schulz Lang, Ernesto,Abram, Ulrich
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- Diversity in photoredox chemistry of oxo or hydroxo complexes of S2 metal ions
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The electronic spectra of hydroxo or oxo complexes of the s2 metal ions Tl+, Sn2+, Sb3+, Bi3+ and Te4+ in alkaline solutions display absorption bands in the UV region which are assigned to metal-centered sp transitions. In the case of Tl+ and Sn2+ these sp-excited states are also luminescent. TlOH is photooxidized to Tl2O3 by molecular oxygen while the photooxidation of Sn(OH)3- to Sn(OH)62- is even achieved by water which is reduced to hydrogen. Both complexes produce hydrated electrons upon 266 nm laser excitation. No electron ejection can be observed for the hydroxo or oxo metalates of Sb3+, B3+ and Te4+, which undergo a photoreduction to the metallic state with a concomitant oxidation of hydroxide to hydrogen peroxide and/or oxygen.
- Oldenburg, Karin,Vogler, Arnd,Horvath, Otto
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- An investigation into the effect of ionic species on the formation of ZnTe from a citric acid electrolyte
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Cathodic electrodeposition of ZnTe film was carried out on Au/Cu substrate using three kinds of citric acid electrolytes, each with a different counter anion, i.e., sulfate, chloride, or nitrate ions, to investigate the anion species' influence on the morphology, composition and structure of the resulting electrodeposited ZnTe films. Both chloride and nitrate electrolytes gave crystalline ZnTe films with almost stoichiometric ZnTe composition under electrolytic conditions similar to those optimized previously for sulfate electrolyte. The mean crystallite size of the electrodeposited ZnTe films ranged from 13 to 37 nm. The effect of the ionic species on the crystallite size was also investigated. The degree of ZnTe(1 1 1) plane orientation of the films obtained from nitrate electrolyte was stronger than that of the films from sulfate or chloride electrolytes. High resolution SEM observations revealed different morphologies depending on the anion in the electrolytic solution.
- Ishizaki, Takahiro,Saito, Nagahiro,Takai, Osamu,Asakura, Shuichi,Goto, Kaori,Fuwa, Akio
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- Synthesis of tellurium nanotubes by galvanic displacement
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Tellurium nanotubes with controlled diameter and wall thickness were synthesized by galvanic displacement of cobalt nanowires and their temperature dependent field effect transistor and magnetoresistance properties were systematically investigated. The nanotube diameter was slightly larger than the sacrificial cobalt nanowire diameter with a wall thickness of range from 15 to 30 nm depending on the diameter of cobalt nanowires. Te nanotubes show p-type semiconducting property with the field effect carrier mobility of approx. 0.01 cm2/V s which is relatively lower than other 1D nanostructure. Low mobility might be attributed to porous morphology with small grain size (a Conwell-Weisskopf relationship to temperatures below 250 K, indicating that the dominant scattering sites are ionized impurity centers. Unique MR behavior was observed from nanotube with a maximum magnetoresistance ratio of 37% at 260 K.
- Rheem, Youngwoo,Chang, Chong Hyun,Hangarter, Carlos M.,Park, Deok-Yong,Lee, Kyu-Hwan,Jeong, Yong-Soo,Myung, Nosang V.
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- The Synthesis of CdTe by Means of Fused Salt Electrolysis and Its Characterization
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Crystalline cadmium telluride layers of a cubic structure have been deposited potentiostatically on graphite cathodes by means of fused salt electrolysis employing CdCl2 and TeO2/Na2TeO3 in an LiCl-KCl eutectic melt at 450 deg C.X-Ray diffraction and scanning-electron-microscope studies show that (i) these layers have a tendency to grow with a preferred orientation along the direction and (ii) the surface morphology changes drastically with the change in the applied potential.Voltammetric analyses indicate two distinct mechanisms for cadmium telluride deposition; one is the codeposition of cadmium and tellurium occurring at potentials more negative than -0.2 V (vs.Ag/AgCl), and the other is the ionic reaction of the cathodically formed telluride ion with the cadmium ion occurring at potentials more negative than -0.7 V (vs.Ag/AgCl).As-deposited crystals are either n- or p-type, depending on the melt composition and the applied potential.
- Minoura, Hideki,Kitakata, Masakazu,Sugiura, Takashi,Murayama, Minoru,Ueno, Yasusada
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- The dehydration of SrTeO3(H2O) - A topotactic reaction for preparation of the new metastable strontium oxotellurate(IV) phase ε-SrTeO3
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Microcrystalline single-phase strontium oxotellurate(IV) monohydrate, SrTeO3(H2O), was obtained by microwave-assisted hydrothermal synthesis under alkaline conditions at 180 °C for 30 min. A temperature of 220 °C and longer reaction
- Stoeger, Berthold,Weil, Matthias,Baran, Enrique J.,Gonzalez-Baro, Ana C.,Malo, Sylvie,Rueff, Jean Michel,Petit, Sebastien,Lepetit, Marie Bernadette,Raveau, Bernard,Barrier, Nicolas
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- Electrodeposition of SbTe phase-change alloys
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Electrodeposition of SbTe thin films was investigated at room temperature, where amorphous deposits were obtained. The electrodeposition of Sb was found to be induced by Te, while the latter was not affected by the Sb. Detailed studies on this induced deposition were carried out by varying the Sb(III) and Te(IV) concentrations, pH, and agitation. The Sb deposition rate was found to be independent of the concentrations of both species but dependent on the pH and agitation. A phase transition from amorphous films into crystalline Sb2 Te3 at 120°C was observed for the plated SbTe.
- Huang,Kellock,Raoux
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- Preparation of high-purity TeO2-ZnO glass batches
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Tellurium oxide-zinc oxide glass batches have been prepared through chemical vapor deposition from tellurium and zinc alkyl compounds in an oxyhydrogen flame onto the lateral surface of rotating cylindrical substrates. The composition of the deposits has
- Moiseev,Dorofeev,Chilyasov,Kut'In,Pimenov,Plotnichenko,Koltashev
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- Electrodeposition of bismuth telluride films from a nonaqueous solvent
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The author examines Bi2Te3 deposition from a DMSO solution containing TeCl4 and Bi(NO3)3 × 5H2O by means of cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). Accumu
- Li, Wen-Jin
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- Electrodeposition of Sb, Bi, Te, and their alloys in AlCl3-NaCl-KCl molten salt
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The Electrochemistry of Sb, Bi, and Te in AlCl3-NaCl-KCl molten salt containing SbCl3, BiCl3, and/or TeCl4 at 423 K was investigated by voltammetry, and electrodeposition of the three metals was performed under constant potential control in the melt. The voltammogram on a glassy carbon (GC) electrode in a melt containing 0.025 mol dm-3 [M] SbCl3 showed a couple of redox peak corresponding to the Sb/Sb(III) redox reaction, and a stable layer of pure Sb was deposited under the constant potential control. The voltammograms in the melt containing 0.025 M BiCl3 or 0.025 M TeCl4 showed several redox couples. Stable deposit layers of pure Bi and Te were not obtained under the constant potential control, as the deposited layers detached from the electrode and immediately dissolved into the molten salt. Binary alloy deposition was possible in a melt containing BiCl3 and SbCl3, and also with BiCl3 and TeCl4. A stable Bi-Sb alloy deposit of metallic Sb and Bi-Sb solid solution was obtained at 0.8 and 0.9 V versus Al/Al(III) in the melt containing BiCl3 and SbCl3. The atomic ratio of Bi in the deposit was 37% at 0.9 V and 57% at 0.8 V. A stable Bi-Te alloy deposit was also obtained with the molten salt containing BiCl3 and TeCl4. The deposited Bi-Te alloy consisted of a mixture of Bi2Te3, BiTe, and Bi2Te. The alloy deposit had good crystallinity and the preferential orientation was the (1 1 0) plane.
- Ebe, Hirofumi,Ueda, Mikito,Ohtsuka, Toshiaki
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- Rod-like Te as excellent microwave absorber: a new exploration
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In this study, we report a facile method to prepare rod-like Te material, which can be used as a novel microwave absorber. Diameter of the Te rods can be tuned in the range of 46–51 nm by changing the reaction time. With the increase of Te particle diameter in the composites, the microwave absorbing property gets worse. As for the Te-0.5 sample with diameter of 45.7 nm, a maximum reflection loss value of ?53.8 dB at 16.0 GHz and an effective absorption bandwidth (4.8 GHz) ranging from 13.2 to 18 GHz at the thickness of only 1.55 mm can be achieved. To the best of our knowledge, it is the first time to investigate the microwave response of Te rods. These rods show obvious potential for lightweight, highly efficient microwave absorption in high frequency.
- Chen, Jiabin,Tan, Shujuan,Liang, Xiaohui,Liu, Wei,Ji, Guangbin
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- A room temperature self-sacrificing template route to Ag2Te fibers
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Tellurium fibers are first synthesized through the reduction of Na 2TeO4 by hydrazine hydrate. The as-prepared tellurium fibers are used as templates for further reaction with aqueous AgNO3 solution to get Ag2Te fibers at room temperature. Copyright
- Mu, Li,Wan, Junxi,Ma, Dekun,Zhang, Rui,Yu, Weichao,Qian, Yitai
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- Synthesis, structures, and multinuclear NMR spectra of tin(II) and lead(II) complexes of tellurium-containing imidodiphosphinate ligands: Preparation of two morphologies of phase-pure PbTe from a single-source precursor
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Group 14 metal complexes of heavy chalcogen-centered anions, M[(TeP iPr2)2N]2 (5, M = Sn; 6, M = Pb) and M(TePiPr2NPiPr2Se)2 (7, M = Sn; 8, M = Pb), were synthesized in 64-89% yields by metathesis of alkali-metal salts of the ligands with group 14 metal dihalides. Crystallography characterization of the complexes revealed that 5, 6, and 8 engage in metal ... chalcogen secondary bonds to generate dimers, whereas 7 is monomeric in the solid state. Multinuclear (1H,31P, 77Se, and 125Te) solution NMR data for these homoleptic complexes evinced dynamic behavior leading to the equivalence of the two ligand environments. The Pb complex 6 was utilized as a single-source precursor to micrometer-scale lead telluride particles via two divergent techniques: aerosol-assisted chemical vapor deposition of the complex in THF/CH2CI2 solution onto glass substrates yielded rectangular prisms, while solution injection of 6 in tri-n-octylphosphine onto Si/SiO2(100) substrates heated to 200-220 °C resulted in the formation of wires. PXRD and EDX analysis of the products confirmed the phase purity of the PbTe materials.
- Ritch, Jamie S.,Chivers, Tristram,Ahmad, Kibriya,Afzaal, Mohammad,O'Brien, Paul
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- Synthese und Reaktivitaet von Diferrocenyl-thio-, -seleno- und -telluro-keton
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Chalcogenoketones (Fc)2C=X 1a (X = S, Fc = Ferrocenyl), 1b (X = Se), and 1c (X = Te) are synthesized by reaction of diferrocenylketone with P4S10, bis(dimethylaluminum)-selenide; bis(dimethylaluminum)-telluride, respectively.Reaction with (M = Cr, Mo, W) yields, for 1a, the complexes 2ad (M = Cr), 2af (M = W), and 3; and for 2b, the complex 2bf.Telluroketone 1c does not form a complex; instead detelluration takes place and tetraferrocenylethylene (Fc)2C=C(Fc)2 is obtained quantitatively.The structure of compound 3 has been determined by X-ray diffraction study.All compounds, except the extremely air-sensitive chalcogenoketones 1b and 1c, have been characterized by the usual spectroscopic and analytical methods.
- Denifl, Peter,Bildstein, Benno
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- An Fe-doped NiTe bulk crystal as a robust catalyst for the electrochemical oxygen evolution reaction
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An Fe doped NiTe bulk crystal was demonstrated as a robust catalyst for the electrochemical oxygen evolution reaction. The promotion effect at least can be correlated with the significant electronic effect and the formation of lattice oxygen via bimetallic synergy by Fe doping.
- Zhong, Lei,Bao, Yufei,Yu, Xu,Feng, Ligang
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supporting information
p. 9347 - 9350
(2019/08/08)
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- Ultralong Ternary PtRuTe Mesoporous Nanotubes Fabricated by Micelle Assembly with a Self-Sacrificial Template
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High surface area and fast mass transport rate are important to enhance the activity and stability of catalysts. In this work, tellurium nanowires and F127 triblock copolymer are used as self-sacrificial and soft templates, respectively, to synthesize PtR
- Yin, Shuli,Wang, Hongjing,Deng, Kai,Dai, Zechuan,Wang, Ziqiang,Xu, You,Li, Xiaonian,Xue, Hairong,Wang, Liang
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p. 5316 - 5321
(2019/03/21)
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- Highly reversible Na-ion reaction in nanostructured Sb2Te3-C composites as Na-ion battery anodes
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Sb2Te3 and its amorphous carbon-modified nanocomposite (Sb2Te3-C) are synthesized by simple solid-state synthetic methods, and their potential as anode materials for rechargeable Na-ion batteries (NIBs) is evaluated. Ex situ X-ray diffraction and high-resolution transmission electron microscopy clearly demonstrate the sodiation/desodiation reaction mechanism of the Sb2Te3 and Sb2Te3-C nanocomposite electrodes. In both electrodes, Sb2Te3 is converted into Na3Sb and Na2Te during Na insertion. However, Na3Sb and Na2Te in only the Sb2Te3-C nanocomposite electrode recombine into the original Sb2Te3 phase after full Na extraction. As a consequence of its interesting conversion/recombination reaction during sodiation/desodiation reaction, the Sb2Te3-C nanocomposite electrode exhibits a long cycle life with highly reversible gravimetric and volumetric capacity (373 mAh g-1 and 765 mAh cm-3 over 50 cycles) and fast rate capability (1 C: 391 mAh g-1 and 802 mAh cm-3; 2 C: 377 mAh g-1 and 773 mAh cm-3).
- Nam, Ki-Hun,Choi, Jeong-Hee,Park, Cheol-Min
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p. A2056 - A2064
(2018/02/28)
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- Synthesis, characterization, and solution behavior of mercury(II) chloride complexes with phosphine tellurides
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The reaction of mercury(II) chloride with neutral phosphine telluride ligands (R3PTe) produced new mercury(II) complexes, HgCl2(R3PTe)2 [R = Me2N (1), Et2N (2), C4H8N
- Mallek,Sanhoury,Bahri,Khaddar,Ben Dhia
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p. 726 - 734
(2016/03/12)
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- Electrochemical synthesis of organochalcogenides in aqueous medium
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The electrochemical preparation of telluride, selenide and sulfide ions was carried out in NaOH aqueous solution, using a two compartment cell. Organochalcogenides were prepared from halogenated compounds in a two-step procedure. The monochalcogenides were obtained as the major products in good yields.
- Ribeiro Neto, Pedro B.,Santana, Sonydelane O.,Levitre, Guillaume,Galdino, Danilo,Oliveira, Jadson L.,Ribeiro, Rogério T.,Barros, Maria E. S. B.,Bieber, Lothar W.,Menezes, Paulo H.,Navarro, Marcelo
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supporting information
p. 657 - 661
(2016/02/12)
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- Wet-chemical synthesis of different bismuth telluride nanoparticles using metal organic precursors-single source vs. dual source approach
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Thermolysis of the single source precursor (Et2Bi)2Te 1 in DIPB at 80 °C yielded phase-pure Bi4Te3 nanoparticles, while mixtures of Bi4Te3 and elemental Bi were formed at higher temperatures. In contrast, cubic Bi2Te particles were obtained by thermal decomposition of Et2BiTeEt 2 in DIPB. Moreover, a dual source approach (hot injection method) using the reaction of Te(SiEt3)2 and Bi(NMe2)3 was applied for the synthesis of different pure Bi-Te phases including Bi2Te, Bi4Te3 and Bi2Te3, which were characterized by PXRD, REM, TEM and EDX. The influence of reaction temperature, precursor molar ratio and thermolysis conditions on the resulting material phase was verified. Moreover, reactions of alternate bismuth precursors such as Bi(NEt2)3, Bi(NMeEt)3 and BiCl3 with Te(SiEt3)2 were investigated.
- Bendt, Georg,Weber, Anna,Heimann, Stefan,Assenmacher, Wilfried,Prymak, Oleg,Schulz, Stephan
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p. 14272 - 14280
(2015/08/18)
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- Comparative study on the efficiency of the photodynamic inactivation of candida albicans Using CdTe Quantum Dots, Zn(II) Porphyrin and Their Conjugates as Photosensitizers
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The application of fluorescent II-VI semiconductor quantum dots (QDs) as active photosensitizers in photodymanic inactivation (PDI) is still being evaluated. In the present study, we prepared 3 nm size CdTe QDs coated with mercaptosuccinic acid and conjugated them electrostatically with Zn(II) meso-Tetrakis (N-ethyl-2-pyridinium-2-yl) porphyrin (ZnTE-2-PyP or ZnP), thus producing QDs-ZnP conjugates. We evaluated the capability of the systems, bare QDs and conjugates, to produce reactive oxygen species (ROS) and applied them in photodynamic inactivation in cultures of Candida albicans by irradiating the QDs and testing the hypothesis of a possible combined contribution of the PDI action. Tests of in vitro cytotoxicity and phototoxicity in fibroblasts were also performed in the presence and absence of light irradiation. The overall results showed an efficient ROS production for all tested systems and a low cytotoxicity (cell viability a higher cytotoxicity (cell viability >90%) depending on QD concentration compared to the bare groups. The PDI effects of bare CdTe QD on Candida albicans demonstrated a lower reduction of the cell viability (~1 log10) compared to bare ZnP which showed a high microbicidal activity (~3 log10) when photoactivated. The QD-ZnP conjugates also showed reduced photodynamic activity against C. albicans compared to bare ZnP and we suggest that the conjugation with QDs prevents the transmembrane cellular uptake of the ZnP molecules, reducing their photoactivity.
- Viana, Osnir S.,Ribeiro, Martha S.,Rodas, Andréa C. D.,Rebou?as, Júlio S.,Fontes, Adriana,Santos, Beate S.
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p. 8893 - 8912
(2016/09/04)
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- Cyclopalladation of telluro ether ligands: Synthesis, reactivity and structural characterization
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Treatment of [PdCl2(PhCN)2] with diaryl telluride in 1:2 molar ratio gave mononuclear palladium complexes, trans-[PdCl2(TeR2)2] (1) (R = Mes (1a) (Mes = 2,4,6-trimethylphenyl), Ph (1b), o-tol (1c) (o-tol = ortho-tolyl)). Reaction of [PdCl2(TeMes2)2] with one equivalent of [PdCl2(PhCN)2] or Na2PdCl4 with TeRR′ afforded chloro-bridged binuclear complexes, [Pd2(μ-Cl)2Cl2(TeRR′)2] (2) (R/R′ = Mes/Mes (2a); Mes/Ph (2b); Ph/Ph (2c)). A toluene-methanol solution of trans-[PdCl2(TeMes2)2] on refluxing for 30 minutes yielded a binuclear cyclopalladated complex, [Pd2(μ-Cl)2{CH2C6H2(4,6-Me2)TeMes)}2] (3). When the refluxing was prolonged, a mononuclear complex cis-[PdCl2{MesTeCH2C6H2(4,6-Me2)TeMes}] (4) was isolated. Treatment of palladium acetate with TeMes2 afforded an acetato-bridged analogue of 3, [Pd2(μ-OAc)2{CH2C6H2(4,6-Me2)TeMes}2] (5a) together with a very minor component, a tetranuclear complex, [Pd(μ-OAc)(μ-TeMes)]4 (6). This reaction with unsymmetrical tellurides, MesTeR, also gave cyclopalladated complexes [Pd2(μ-OAc)2{CH2C6H2(4,6-Me2)TeR}2] (R = o-tol (5b) and Ph (5c)) in which 2-methyl of the mesityl group of the telluride was exclusively metallated. The complex trans-[PdCl2(TeMes2)2] on refluxing in xylene gave palladium telluride, Pd7Te3. These complexes were characterized by elemental analyses, IR and NMR (1H, 13C and 125Te) spectroscopy. The molecular structures of trans-[PdCl2(TeMes2)2] (1a), [Pd2(μ-Cl)2Cl2(TeMes2)2]·2acetone (2a·2acetone), cis-[PdCl2{MesTeCH2C6H2(4,6-Me2)TeMes}] (4), [Pd2(μ-OAc)2{CH2C6H2(4,6-Me2)TeMes)}2]·toluene (5a·toluene), [Pd2(μ-OAc)2{CH2C6H2(4,6-Me2)Tetol-o}2] (5b) and [Pd(μ-OAc)(μ-TeMes)]4 (6) were established by single crystal X-ray diffraction analyses. The mononuclear complex 1a was isolated in two polymorphic forms each with the trans configuration. This journal is
- Kolay, Siddhartha,Kumar, Mukesh,Wadawale, Amey,Das, Dasarathi,Jain, Vimal K.
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p. 16056 - 16065
(2015/01/09)
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- Fast synthesis of double-directional tellurium submicron needles by microwave-assisted solution method
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A facile microwave-assisted solution method has been employed for the fast synthesis of tellurium double-directional submicron needles. A possible growth mechanism related to self-seed catalysis anisotropic growth combined with effects of PVP, concentration depletion and crystal surface tension is proposed and discussed.
- Pei, Jian,Chen, Gang,Jia, Dechang,Jin, Rencheng,Sun, Jingxue,Yu, Yaoguang
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p. 241 - 244
(2013/02/25)
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- Lattice-matched transition metal disulfide intergrowths: The metallic conductors Ag2Te(MS2)3 (M = V, Nb)
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We present new chalcogenide compounds, Ag2Te(MS 2)3 (M = V, Nb), built up of alternating planes of [MS2] and [Ag2Te]. The Ag and Te atoms are linearly coordinated by S atoms in the [MS2] layers and held in place by covalent interactions. Structural polymorphism was found by single crystal X-ray diffraction studies, where long-range ordering or disorder of the Ag and Te atoms within the hexagonal planar [Ag2Te] layer yielded two distinct crystal forms. When the Ag and Te atoms are ordered, the two isostructural compounds crystallize in the non-centrosymmetric P6I...2m space group, with a = 5.5347(8) A, c = 8.0248(16) A, and V = 212.89(6) A3 for α-Ag2Te(VS2)3 and a = 5.7195(8) A, c = 8.2230(16) A, and V = 232.96(6) A3 for α-Ag2Te(NbS2)3. For the occupationally disordered Ag/Te arrangement, a subcell of the ordered phase that crystallizes in the non-centrosymmetric P6I...m2 space group, with a = 3.2956(6) A (=aa/(3)1/2), c = 8.220(2) A, and V = 77.31(3) A3 for β-Ag 2Te(VS2)3, was identified. Furthermore, pair distribution function analysis revealed local distortions in the [Ag 2Te] layer. Band structure calculations at the density functional theory level were carried out to investigate the electronic structure of Ag 2Te(MS2)3. Electronic transport measurements on Ag2Te(MS2)3 show that they exhibit p-type metallic behavior. Thermal analyses and temperature-dependent powder X-ray diffraction studies were focused on the stability and transformation/ decomposition of the Ag2Te(MS2)3 phases. Magnetic susceptibility data are also reported. The new intercalated Ag 2Te(MS2)3 system features a unique hypervalent Te with a three-center, four-electron bonding environment isoelectronic to that found in I3-.
- Nguyen, Sandy L.,Malliakas, Christos D.,Francisco, Melanie C.,Kanatzidis, Mercouri G.
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p. 6520 - 6532
(2013/07/19)
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- Tetrahydrofuran ring opening and unexpected oxidation of the furyl ring in the reaction of bis(2-furyl) ditelluride with iodine and triphenylphosphine
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The reaction of bis(2-furyl) ditelluride Fu2Te2 (1) with iodine in diethyl ether under ambient conditions expectedly yields FuTeI (2). The in situ reaction of 2 with triphenylphosphine affords Ph 3PTe(Fu)I (3), which was characterized in the solid state by single crystal X-ray crystallography. The crystal structure of 3 shows linear P-Te-I backbone and T-shaped coordination around the tellurium atom. In the solid lattice, 3 exists as discrete molecules, which are lined together by a Ha?I hydrogen bonding network. There is no evidence of the secondary bonding Tea?I or Ia?I interactions, which are typical for many tellurium-iodine compounds. When this two-step reaction of Fu 2Te2 with I2 and PPh3 is carried out in tetrahydrofuran, a mixture of products is obtained. The main products, which were identified by single-crystal X-ray crystallography, are {Ph 3P(C4H5O2)}2[TeI 4] (4), {Ph3P(CH2)4PPh 3}[TeI4]·2CH2Cl2 (5·2CH2Cl2), Fu2Te (6), (CH 2)4TeI2 (7), Ph3PO, and elemental tellurium. The formation of the products has been discussed in terms of THF ring opening, abstraction of tellurium by PPh3, and the conversion of the furyl ring in FuTeI into a lactone ring due to the presence of atmospheric moisture.
- N?rhi, Sari M.,Malo, Kaisa,Oilunkaniemi, Raija,Laitinen, Risto S.
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p. 308 - 315
(2013/10/08)
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- Conditions of hydrochemical synthesis, composition, and structure of tellurium films
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Conditions of the hydrochemical synthesis of thin tellurium fi lms by reduction of an aqueous solution of tellurous acid with hydrazine were determined. The redox potentials of tellurous acid and hydrazine and their difference in relation to pH of the med
- Maskaeva,Zarubin,Vovkotrub,Markov
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p. 731 - 735
(2012/08/29)
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- Electrodeposition of bismuth telluride thermoelectric films from a nonaqueous electrolyte using ethylene glycol
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Ethylene glycol was studied as an electrolyte for the electrodeposition of thermoelectric bismuth telluride films by cyclic voltammetry, rotating ring disk electrode and electrochemical quartz crystal microbalance (EQCM). The reduction of both Bi3+ and Te4+ ions proceeds in one step without the formation of intermediates at potentials more negative than +0.2 V and +0.55 V vs. SHE, respectively. The diffusion coefficients and the rate constants for reduction were found to be similar for Bi and Te. Stoichiometric Bi 2Te3 films with a uniform composition profile were obtained from solutions containing up to 1 M of Bi(NO3)3 and TeCl4, at current densities up to 5 A dm-2 (~102 μm h-1). Both p- and n-type bismuth telluride films could be obtained, as confirmed by Seebeck coefficient measurements.
- Nguyen, Hai P.,Wu, Minxian,Su, Jiale,Vullers, Ruud J.M.,Vereecken, Philippe M.,Fransaer, Jan
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- Conversion of Sb2Te3 hexagonal nanoplates into three-dimensional porous single-crystal-like network-structured Te plates using oxygen and tartaric acid
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Pore genius: Sb2Te3 hexagonal nanoplates can be transformed into 3D porous network-structured Te plates by the dissolution of Sb3+ ions induced by tartaric acid (TA), the O2-assisted oxidation of Te2-
- Zhang, Hua,Wang, Huan,Xu, You,Zhuo, Sifei,Yu, Yifu,Zhang, Bin
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p. 1459 - 1463
(2012/03/11)
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- Intramolecularly coordinated organotin tellurides: Stable or unstable?
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The step-wise oxidation of an organotin(I) compound with elemental tellurium gave a variety of unprecedented organotin tellurides containing tin atoms in the oxidation states +II and +IV (see examples). Copyright
- Bouska, Marek,Dostal, Libor,Padelkova, Zdenka,Lycka, Antonin,Herres-Pawlis, Sonja,Jurkschat, Klaus,Jambor, Roman
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p. 3478 - 3482
(2012/06/05)
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- Molecular structures, reactivity, and NMR spectroscopic studies of cyclic and non-cyclic silyl-substituted 1, 2-dicarba-closo-dodecaborane(12) derivatives
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Non-cyclic and cyclic silyl-substituted 1, 2-dicarba-closo-dodecaborane(12) derivatives were prepared mainly by salt elimination methods. Several known and new compounds were structurally characterized by X-ray analysis in the solid state and by mulinuclear magnetic resonance (1H, 11B, 13C, 29Si, 77Se, and 125Te NMR) in solution. This includes the 1, 2-bis(trimethylsilyl) and 1, 2- bis(chlorodimethylsilyl) derivatives as examples for non-cyclic compounds and a series of 1, 1, 3, 3-tetramethyl-4, 5-[1, 2-dicarba-closo-dodecaborano(12)]-1, 3-disila-2-element-cyclopentanes (element = S, Se, Te). Numerous spin-spin coupling constants were determined together with their signs. Molecular gas phase geometries for most compounds studied were optimized by calculations [B3Lyp/6-311+G(d, p)], and NMR parameters were calculated at the same level of theory. The conversion of silyl-substituted ortho-carboranes into their respective 7, 8-dicarba-nido-undecaborate(1-) derivatives was explored successfully for several examples.
- Wrackmeyer, Bernd,Klimkina, Elena V.,Milius, Wolfgang
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p. 1080 - 1092
(2012/07/16)
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- Synthesis of ultra-long hollow chalcogenide nanofibers
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Electrospinning and galvanic displacement reaction are combined to fabricate ultra-long hollow chalcogen and chalcogenide nanofibers in a cost-effective and high throughput manner. This procedure exploits electrospinning to fabricate ultra-long sacrificial nanofibers with controlled dimensions and morphology, thereby imparting control over the composition and shape of the nanostructures evolved during galvanic displacement reaction. It is believed to be a general route to form various ultra-long hollow semiconducting nanofibers.
- Lee, Kun-Jae,Song, Hanbok,Lee, Young-In,Jung, Hyunsung,Zhang, Miluo,Choa, Yong-Ho,Myung, Nosang V.
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p. 9107 - 9109
(2011/09/15)
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- Preparation by Hydrothermal Techniques in a Tungstosilicate Acid Solution System and Optical Properties of Tellurium Nanotubes
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Single-crystalline tellurium nanotubes can be easily synthesised by a simple hydrothermal, economical, and green chemical route. The tungstosilicate acid (TSA) serves as not only an effective reducing agent but also a new morphology-directing agent for te
- Zhang, Li,Wang, Cong,Wen, Deyun
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p. 3291 - 3297
(2009/12/01)
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- An efficient templating approach for synthesis of highly uniform CdTe and PbTe nanowires
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Highly uniform CdTe nanowires with a very high aspect ratio of ~1000 and an average diameter of 12 nm can be conveniently synthesized using ultrathin Te nanowires as templates via a low-temperature hydrothermal process. Several other interesting CdTe nano
- Liang, Hai-Wei,Liu, Shuo,Wu, Qing-Song,Yu, Shu-Hong
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p. 4927 - 4933
(2009/12/01)
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- Morphology of tellurium electrolytically deposited in a pulsed mode
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Morphology of tellurium deposits produced by pulsed electrolysis of 0.005-0.05 M TeCl4 solutions in dimethyl sulfoxide was studied. The effect of the TeCl4 concentration and pulsed current parameters on the structure of electrolytica
- Kalymon,Bilan',Kuntyi
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p. 1226 - 1229
(2009/12/08)
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- Microwave-assisted preparation of Bi2Te3 hollow nanospheres
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Bi2Te3 hollow nanospheres with diameters of 50-100 nm have been successfully prepared using TeO2, Bi(NO3) 3, and HNO3 in mixed solvents of water and ethylene glycol by a simple microwave heating method at 150°C for 30 min. Copyright
- Jiang, Ya,Zhu, Ying-Jie,Chen, Li-Dong
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p. 382 - 383
(2007/10/03)
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- Electrochemical deposition of tellurium from TeCl4 solutions in aprotic solvents
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Electrolysis of 0.01-0.1 M TeCl4 solutions in dimethyl sulfoxide, dimethylformamide, and acetonitrile was studied in the temperature range 20-60°C. The microscopic structure of cathode deposits was analyzed.
- Kuntyi,Okhremchuk,Yavorskii
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p. 1327 - 1330
(2008/03/13)
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- Syntheses, X-ray structures and AACVD studies of group 11 ditelluroimidodiphosphinate complexes
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Reactions of Na(tmeda)[N(iPr2PTe)2] with CuCl, AgI or AuCl (in the presence of PPh3) in THF produced the coinage metal ditelluroimidodiphosphinate complexes {Cu[N(iPr 2PTe)2]}3, (5), {Ag[N(iPr 2PTe)2]}6 (6) and Au(PPh3)[N( iPr2PTe)2] (7), respectively. Complexes 5, 6 and 7 were characterized in the solid state by X-ray crystallography. Complex 5 is trimeric and exhibits a highly distorted Cu3Te3 ring. In contrast, the Ag(i) complex 6 is a hexamer, and forms a twelve-membered Ag6Te6 ring. The replacement of the iPr groups on phosphorus by Ph results in an intriguing structural change to a tetramer with a boat-shaped Ag4Te4 ring in {Ag[N(Ph 2PTe)2}4·2THF (8). The gold(i) complex 7 is monomeric. Aerosol-assisted chemical vapour deposition (AACVD) of compounds 5, 6 and 7 yields CuTe, Ag7Te4, AuTe2 and Au films, respectively. The films were grown at temperatures of 300-500 °C and characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive analysis of X-rays (EDAX). The Royal Society of Chemistry 2007.
- Copsey, May C.,Panneerselvam, Arunkumar,Afzaal, Mohammad,Chivers, Tristram,O'Brien, Paul
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p. 1528 - 1538
(2007/10/03)
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- Bi2Te3/Te multiple heterostructure nanowire arrays formed by confined precipitation
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The Bi2Te3/Te multiple heterostructure nanowire arrays were successfully synthesized through a simple thermal annealing process of the supersaturated Bi-Te alloy nanowire arrays. On the basis of the systematic investigations of the thermal treatment processes, it is considered that the precipitation confined by porous anodic alumina (PAA) membranes leads to the spontaneous formation of the block-by-block structure. The self-assembled blocks in the heterostructure nanowires are single-crystalline, and the clear interface between neighboring blocks is flat and perpendicular to the wire axis. Copyright
- Wang, Wei,Lu, Xiaoli,Zhang, Tao,Zhang, Genqiang,Jiang, Wenjun,Li, Xiaoguang
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p. 6702 - 6703
(2008/02/02)
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- Cs2Gd6N2Te7: The first quaternary nitride telluride of the lanthanides
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The first quaternary nitride telluride with trivalent gadolinium, Cs2Gd6N2Te7, was obtained by the reaction of metallic gadolinium with cesium azide, elemental tellurium, and gadolinium trichloride as well as cesium chloride as flux at 900 °C for 7 days in evacuated silica tubes. Single crystals occur as long black needles and crystallize in the monoclinic space group C2/m (a = 2403.1(2) pm, b = 424.03(3) pm, c = 1142.91(7) pm, β = 103.709(4)°, Z = 2). Three crystallographically different Gd3+ cations constitute the structure, two are coordinated by one N3- (d(Gd(1/2)-N) = 217 pm) and five Te2- anions (d(Gd(1/2)-Te) = 305-326 pm), and the third Gd3+ by two N3- (d(Gd(3)-N) = 244 pm) and four Te2- anions (d(Gd(3)-Te) = 316-317 pm), all forming distorted octahedra about Gd3+. The Cs+ cation shows a perfect bicapped trigonal prism (C.N. = 8, d(Cs-Te) = 383-431 pm) as coordination sphere. Two of these polyhedra are condensed via a common (non-capped) rectangular face building up double prisms [Cs2Te12]22-. Further linkage via triangular faces (along [0 1 0]) and two of the four caps (along [0 0 1]) results in corrugated layers [Cs2Te7]12- running parallel to (1 0 0). However, the main feature of the crystal structure comprises N3--centered (Gd3+)4 tetrahedra (d(N-Gd) = 217 pm (2×) and 244 pm (2×); {measured angle}(Gd-N-Gd) = 107° (2 + 2 + 1×) and 121° (1×)), which are connected via two vertices each to build up one-dimensional infinite chains ∞1{ [ N (Gd 1)1 / 1t (Gd 2)1 / 1t (Gd 3)2 / 2v ]6 + } (t = terminal, v = vertex-shared) along [0 1 0] like in the structure of the M3NCh3-type nitride chalcogenides with M = La-Nd, Sm, Gd-Dy, and Ch = S, Se.
- Lissner, Falk,Schleid, Thomas
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- Crystallization kinetics in new Sb14As29Se52Te5 amorphous glass
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Differential scanning calorimetry (DSC) under non-isothermal conditions is used to study the crystallization kinetics of Sb14As29Se52Te5 chalcogenide glass. In addition, two approaches are used to analyze the dependence of glass transition temperature (Tg) on the heating rate (α). One is empirical linear relationship between (Tg) and ln(α). The second approach is the use of straight line ln ( Tg2 / α ) vs. 1/Tg for the evaluation of the activation energy for glass transition. The phases at which the alloy crystallizes after the thermal treatment have been identified by using X-ray diffraction. The diffractogram of the transformed material shows the presence of some crystallites of As, Te, AsSb, As2Se3, Sb2Se3 and AsSe.5Te.5 in the residual amorphous matrix.
- Othman,Aly,Abousehly
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p. 184 - 189
(2008/10/09)
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- PbTe nanorods by sonoelectrochemistry
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(Figure Presented) Highly uniform, single-crystalline PbTe nanorods with a diameter of 7 nm and an aspect ratio of 7 can be obtained by using a sonoelectrochemical method. The metal ion/ligand ratio controls the purity of the PbTe nanostructures through the redox chemistry of the ions involved in the growth process. Transmission electron microscopy of the nanorods reveals the highly uniform morphology obtained (see picture).
- Qiu, Xiaofeng,Lou, Yongbing,Samia, Anna C. S.,Devadoss, Anando,Burgess, James D.,Dayal, Smita,Burda, Clemens
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p. 5855 - 5857
(2007/10/03)
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