物理化学学报 >> 2005, Vol. 21 >> Issue (03): 291-295.doi: 10.3866/PKU.WHXB20050313

研究论文 上一篇    下一篇

恒电位组装的硫醇单层膜的电化学性质

刁鹏; 梅岗; 侯群超; 于峰; 项民; 张琦   

  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
  • 收稿日期:2004-09-23 修回日期:2004-10-20 发布日期:2005-03-15
  • 通讯作者: 刁鹏 E-mail:pdiao@buaa.edu.cn

Electrochemical Properties of Thiol Monolayers Prepared by Constant-Potential Assembly

DIAO Peng; MEI Gang; HOU Qun-Chao; YU Feng; XIANG Min; ZHANG Qi   

  1. Department of Applied Chemistry, School of Materials Science &Engineering, Beijing University of Aeronautics & Astronautics, Beijing 100083
  • Received:2004-09-23 Revised:2004-10-20 Published:2005-03-15
  • Contact: DIAO Peng E-mail:pdiao@buaa.edu.cn

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1 min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5 min时,得到的硫醇膜与自组装24 h的硫醇膜具有相当的致密度和更少的凹陷点缺陷.

关键词: 电化学, 自组装膜, 恒电位组装, 硫醇, 针孔缺陷

Abstract: 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.

Key words: Electrochemistry, Self-assembled monolayers(SAMs), Constant-potential assembly, Thiols, Pinhole defect