Dai Jie, Guo Lin, Jiang Yun, Zhu Qin-yu, Gu Ren-Ao, Jia Ding-xian, Guo Wen-Juan
Department of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215006, PR China.
J Nanosci Nanotechnol. 2005 Mar;5(3):474-8. doi: 10.1166/jnn.2005.063.
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).
制备了一种新型四硫富瓦烯修饰的金胶体。通过紫外可见光谱、拉曼光谱和循环伏安图对2-[4,5-亚乙基二硫基-1,3-二硫醇-2-亚基]-1,3-二硫醇-4-硫醇盐在金纳米颗粒表面的修饰或配位进行了表征。修饰后的金纳米颗粒最有价值的点在于它们的氧化还原活性。四硫富瓦烯修饰的金胶体在铂电极上的循环伏安图显示出两对氧化还原峰，在E1/2 = +0.67 V和+0.87 V（相对于饱和甘汞电极，在乙腈-0.1 M四丁基高氯酸铵中），分别对应于TTF/TTF*+和TTF*+/TTF2+。还制备了用四硫富瓦烯自组装单分子层修饰的金电极，其循环伏安行为与纳米金体系一致。E1/2数据高于中性母体前体的数据，并且E1/2(1)到E1/2(2)的间距变得非常窄。E1/2的数据还表明，无间隔体系（TTF-S-Au）的电化学行为与间隔体系（TTF-S-(CH2)n-Au）不同。
