Paper
RSC Advances
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Fig. 8 Images of S1 on test papers. (a) Only S1, (b) after immersion in
DMSO/H2O (v:v ¼ 1 : 1, buffered with HEPES pH ¼ 7.2) solution with
Ag+, (c) after immersion in DMSO/H2O (v:v ¼ 1 : 1, buffered with HEPES
pH ¼ 7.2) solution with others cations, and (d) after immersion in
DMSO/H2O (v:v ¼ 1 : 1, buffered with HEPES pH ¼ 7.2) solution with
Ag+ and other ions under irradiation at 365 nm.
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ions did not inuence the detection of Ag+ by the test strips.
Therefore, the test strips could conveniently detect Ag+ in the
solution.
Conclusions
In summary, we developed a novel self-assembled supramo-
lecular sensor S1 that could recognize Ag+ over other metal ions
with signicant UV-vis absorption and uorescence quenching
changes with highly selective and sensitive properties based on
the competitive mechanism of supramolecular self-assembly.
The obvious color changes and pronounced ON–OFF-type
uorescence signaling behavior can be seen by the naked
eyes. The limit of detection for Ag+ was as low as 8.18 ꢀ 10ꢁ9
M
in an aqueous solution, which was lower than that in some
previously reported research. We believe that the sensor will be
regarded as an environmentally friendly material that can sense
Ag+ in an aqueous solution and make a great contribution to the
development of silver ion sensors.
Conflicts of interest
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and Y. Jiang, Tetrahedron, 2016, 72, 3980–3985; (d) Y. Jiang,
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There are no conicts to declare.
Acknowledgements
This work was supported by the National Natural Science
Foundation of China (NSFC) (21661028; 21574104; 21262032),
the Natural Science Foundation of Gansu Province
(1506RJZA273), and the Program for Changjiang Scholars and
Innovative Research Team in University of Ministry of Educa-
tion of China (IRT 15R56).
Notes and references
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