高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (3): 380.

• 研究简报 • 上一篇    下一篇

电流滴定法对自组装膜表面酸碱性的研究

罗立强, 赵健伟, 杨秀荣, 汪尔康, 董绍俊   

  1. 中国科学院长春应用化学研究所电分析化学开放研究实验室, 长春 130022
  • 收稿日期:1999-06-18 出版日期:2000-03-24 发布日期:2000-03-24
  • 通讯作者: 董绍俊(1931年出生),女,研究员,博士生导师,主要从事分析化学、电化学分析基础和应用研究.
  • 基金资助:

    国家自然科学基金(批准号:29575209)

Determination of Surface pKaof HS(CH2)10COOH SAMs Using an Electrochemical Titration Method

LUO Li-Qiang, ZHAO Jian-Wei, YANG Xiu-Rong, WANG Er-Kang, DONG Shao-Jun    

  1. Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
  • Received:1999-06-18 Online:2000-03-24 Published:2000-03-24

关键词: 表面酸碱性, 自组装膜, 巯基十一酸

Abstract: The self assembled monolayer(SAM) of 11-mercaptoundecanoic acid [HS(CH2)10COOH] was formed on a gold electrode and the effect of the charge of end group on the electrochemical response of Fe(CN)3- 6 at the SAMmodified electrode was studied by cyclic voltammetry. At high pH, when the —COOHgroups are dissociated, the current of Fe(CN)63- is suppressed; as the solution pHis lowered, the current of Fe(CN)63- increases. The electrochemical titration curve was obtained by correlating the currents of Fe(CN)63- to the different pHvalues of electrolyte, from which the surface pKa was obtained to be 3.0±0.2. Furthermore, the reason of small pKa value was explained using SAMs of different surface coverage.

Key words: Surface pKa, Self assembled monolayer, 11-Mercaptoundecanoic acid, [HS(CH2)10COOH]

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