【摘要】 把带有—NH2的半胱胺和4-氨基硫酚两种短链分子组装到金电极上,形成自组装单分子膜;两种自组装膜在[Fe(CN)6]3-/4-溶液中进行循环伏安扫描时,出现了不同于长链分子自组装膜的行为:峰间距变窄、峰电流变大的现象,这是由于两者在金上组装不够致密,以及末端的—NH2存在对[Fe(CN)6]3-/4-的影响造成的。通过改变溶液的pH,研究溶液中H+浓度对半胱胺自组装膜和4-氨基硫酚自组装膜在[Fe(CN)6]3-/4-溶液中电化学行为的影响;通过电流滴定的方法求算出半胱胺自组装膜和4-氨基硫酚自组装膜的表面pKb分别为2.4±0.2和4.7±0.2;通过在碱性条件下的循环伏安图,对两者的组装效果进行了比较。更多还原

【Abstract】 Two short-chain molecules of cysteamine and 4-aminothiophenol were modified on gold electrode by self-assembled monolayers(SAMs),when they were studied by cyclic voltammetry,it was found that peak current increased and the peak separation decreased.The reason was that the coverage of two modified electrodes was not compacted and [Fe(CN)6]3-/4-was affected by end group NH2of cysteamine and 4-amion-thiophenol.The electrochemical behavior of two modified electrodes was studied in [Fe(CN)6]3-/4-solution at different pH.The surface pKb of the self-assembled monolayers of cysteamine and 4-aminothiophenol was estimated to be 2.4±0.2 and 4.7±0.2 respectively by the electrochemical titration method.The coverage of two modified electrodes was compared by cyclic voltammograms in alkaline solution.更多还原