Preparation of gold nanoparticles modified with tetrathiafulvalene via direct sulfur bridge.
A new tetrathiafulvalene-modified gold colloid was prepared. The modification or coordination of 2-[4,5-ethylenedisulfanyl-1,3-dithiol-2-ylidene]-1,3-dithiole-4-thiolate to the surface of gold nanoparticles was characterized by UV-Vis and Raman spectra, and cyclic voltammograms. The most valuable point of the modified gold nanoparticles is their redox activities. The cyclic voltammogram of the tetrathiafulvalene-modified gold colloid on a Pt electrode showed two pair of redox peaks, at E1/2 = +0.67 V and at +0.87 V (vs. a saturated calomel electrode, in MeCN-0.1 M Bu4NClO4), corresponding to TTF/TTF*+ and TTF*+/TTF2+, respectively. A gold electrode modified with a self-assembled monolayer of the tetrathiafulvalene was also prepared and its cyclic voltammogram behaviors were in accordance with those of the nano-Au system. The E1/2 data are higher than those of the neutral mother precursor and the separation of E1/2(1) to E1/2(2) becomes very narrow. The data of E1/2 also revealed that electrochemical behavior of the no-spacer system (TTF-S-Au) are different from that of a spacer system (TTF-S-(CH2)n-Au).
Dai
Jie
J
Department of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215006, PR China.
Guo
Lin
L
Jiang
Yun
Y
Zhu
Qin-yu
QY
Gu
Ren-Ao
RA
Jia
Ding-xian
DX
Guo
Wen-Juan
WJ
D003102:Colloids; D003460:Crystallization / Q000379:methods; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D006571:Heterocyclic Compounds / Q000032:analysis / Q000737:chemistry*; D008422:Materials Testing; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D010084:Oxidation-Reduction; D010316:Particle Size; D013455:Sulfur / Q000032:analysis / Q000737:chemistry*; D013499:Surface Properties
D003102:Colloids; D006571:Heterocyclic Compounds; D013455:Sulfur; D006046:Gold; C063887:tetrathiafulvalene