Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (03): 291-295.doi: 10.3866/PKU.WHXB20050313

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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

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