恒电位组装的硫醇单层膜的电化学性质  

Electrochemical Properties of Thiol Monolayers Prepared by Constant-Potential Assembly

作　　者：刁鹏[1] 梅岗[1] 侯群超[1] 于峰[1] 项民[1] 张琦[1] 

机构地区：[1]北京航空航天大学,材料科学与工程学院应用化学系,北京100083

出　　处：《物理化学学报》2005年第3期291-295,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20373005)资助项目~~

摘　　要：采用恒电位组装的方法在金基底上制备了十二硫醇单层膜,用反射傅立叶红外光谱、循环伏安法和电化学阻抗谱对得到的硫醇膜进行了表征.结果表明,恒电位组装1min即可在金基底上形成没有针孔缺陷的硫醇单层膜.随着恒电位组装时间的增加,硫醇膜上的凹陷点缺陷逐渐减少,致密程度逐渐增加.当恒电位组装时间达到5min时,得到的硫醇膜与自组装24h的硫醇膜具有相当的致密度和更少的凹陷点缺陷.The monolayer of dodecanethiol was prepared on gold surface by constant-potential assembly (CPA). The properties of the monolayers were characterized using reflection absorption FT-IR, cyclic voltammetry, and electrochemistry impedance spectroscopy. Experimental results show that monolayers free from pin-hole defects can be obtained after CPA for 1 min. As the assembling time increases, the number of collapsed-site defects decreases and the packing density of the thiol monolayer increases. Compared to the monolayers prepared by self-assembly for 24 h, those obtained by CPA for 5 min have almost identical packing density and less collapsed-site defects.

关 键 词：电化学 自组装膜 恒电位组装 硫醇 针孔缺陷 

分 类 号：O621[理学—有机化学]