物理化学学报 >> 1996, Vol. 12 >> Issue (07): 581-588.doi: 10.3866/PKU.WHXB19960702

研究论文 上一篇    下一篇

偶氮苯衍生物自组装膜的表征及组装动力学

赵健伟,于化忠,王永强,汤鸣,蔡生民,刘忠范   

  1. 北京大学化学与分子工程学院智能材料研究中心,北京 100871
  • 收稿日期:1995-12-29 修回日期:1996-01-15 发布日期:1996-07-15
  • 通讯作者: 刘忠范

The Adsorption Kinetics and Characterization of Azobenzene Self-Assembled Monolayers on Gold

Zhao Jian-Wei,Yu Hua-Zhong,Wang Yong-Qiang,Tang Ming,Cai Sheng-Min,Liu Zhong-Fan   

  1. Center for Intelligent Materials Research,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871
  • Received:1995-12-29 Revised:1996-01-15 Published:1996-07-15
  • Contact: Liu Zhong-Fan

摘要:

报导了4-正辛基-4′-(3-巯基丙氧基)偶氮苯(简称C8AzoC3)自组装膜(Self-Assembled Monolnyers SAMs)的表征及其自组装成膜动力学,接触角滴定、原子力显微镜(AFM)及电化学的实验结果表明,C8AzoC3分子在金表面自组装形成致密有序的流水性单分子膜,并且在电极上没有明显的电化学响应.通过控制组装时间,考察了偶氮苯自组装形成单分子膜的动力学过程,从接触角和电化学数据得到组装过程的速率常数kad为(1.2±0.2)×103mol-1•dm3•s-1;依据不同组装时间形成的自组装膜的特征循环伏安行为,提出了C8AzoC3分子在金表面自组装过程的动态模型.

关键词: 偶氮苯, 自组装膜, 原子力显微镜, 接触角滴定, 电化学

Abstract:

 The characterization and adsorption kinetics of azobenzene self-assembled monolayers(C8AzoC3 SAMs) on gold were reported. By assembling for about 24 hours, highly ordered and closely packed C8AzoC3 SAMs can be formed on gold surface and showed no electrochemical response, which were evidenced by contast angle titration, atomic force microscopic abservation and electrochemical measurements. The adsorption kinetics of C8AzoC3 molecules on gold was studied by controlling the assembling time and accompanying with dynamic characterization. The adsorption kinetic rate constant was estimated to be (1.2±0.2) × 103 mol-1•dm3•s-1 by using the data of contast angle titration and electrochemical measurements. A simple model of the self assembling process was suggested to illustrate the unique electrochemical behavior of C8AzoC3 SAMs.

Key words: Azobenzene, Self-assembled monolayers(SAMs), Atomic force microscope(AFM), Contact angle titration, Electrochemistry