176977-39-2Relevant articles and documents
Metal-molecule-metal junctions in langmuir-blodgett films using a new linker: Trimethylsilane
Pera, Gorka,Martin, Santiago,Ballesteros, Luz M.,Hope, Adam J.,Low, Paul J.,Nichols, Richard J.,Cea, Pilar
, p. 13398 - 13405 (2011/03/17)
Herein trimethylsilane (TMS) is demonstrated to be an efficient binding group suitable for construction of metal-molecule-metal (M-mol-M′) junctions, in which one of the metal contacts is an atomically flat gold surface and the other a scanning tunnelling microscopy (STM) tip. The molecular component of the M-mol-M′ devices is an oligomeric phenylene ethynylene (OPE) derivative Me3Si C≡C{C6H4C≡C} 2C6H4NH2, featuring both Me 3SiC≡C and NH2 metal contacting groups. This compound can be assembled into Langmuir-Blodgett (LB) films on Au-substrates by surface binding through the amine groups. Alternatively, low coverage (sub-monolayer) films are formed by adsorption from solution. In the case of condensed monolayers top electrical contacts are formed to STM tips through the TMS end group. In low coverage films, single molecular bridges can be formed between the gold surface and a gold STM tip. The similarity in the I-V response of a one-layer LB film and the single molecule conductance experiments reveals several points of critical importance to the design of molecular components for use in the construction of M-mol-M′ junctions. Firstly, the presence of neighbouring π systems does not have a significant effect on the conductance of the M-mol-M′ junction. Secondly, in the STM configuration, intermolecular electron hopping does not significantly enhance the junction transport characteristics. Thirdly, the symmetric behaviour of the I-V curves obtained, despite the different metal-molecule contacts, indicates that the molecule is simply an amphiphilic electron-donating wire and not a molecular diode with strong rectifying characteristics. Finally, the conductance values obtained from the amine/TMS-contacted OPE described here are of the same order of magnitude as thiol anchored OPEs, making them attractive alternatives to the more conventionally used thiol-contacting chemistry for OPE molecular wires. Junction box: 4-[4-{4-(Trimethylsilylethynyl)phenylethynyl}phenylethynyl]aniline has been assembled into well-packed monolayer films by using the Langmuir-Blodgett technique. Trimethylsilane (TMS) is demonstrated to be an efficient binding group suitable for construction of metal-molecule-metal junctions, making this group an attractive alternative to the more conventionally used thiol-contacting chemistry for molecular wires (see picture). Copyright
Multiple self-assembled nanostructures from an oligo(p-phenyleneethynylene) containing rod-coil-rod triblock copolymer
Li, Kun,Wang, Qing
, p. 4786 - 4788 (2008/01/27)
Induced by systematic variation of the initial polymer concentration in toluene, various morphologies of aggregates including vesicles, spheres, onion-like structures, and worm-like fibers from a rod-coil-rod triblock copolymer, oligo(p-phenyleneethynylene)-polystyrene-oligo(p-phenyleneethynylene) , were observed by transmission electron microscopy. The Royal Society of Chemistry 2005.
Fabrication of carbon nanotube-molecule-silicon junctions
Flatt, Austen K.,Chen, Bo,Tour, James M.
, p. 8918 - 8919 (2007/10/03)
A hybridization strategy for the covalent connection of single wall carbon nanotubes to silicon surfaces via oligo(phenylene ethynylene)s has been demonstrated using an orthogonal bisdiazonium functionalization protocol. Copyright
