高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (10): 1693.

• 研究论文 • 上一篇    下一篇

溶剂对自组装单分子膜电化学行为的影响

孙乔玉, 张校刚, 李晓红, 力虎林   

  1. 兰州大学化学化工学院, 兰州 730000
  • 收稿日期:2000-01-12 出版日期:2001-10-24 发布日期:2001-10-24
  • 通讯作者: 力虎林(1936年出生),男,教授,博士生导师,从事电化学、材料化学基础和应用研究.
  • 基金资助:

    国家自然科学基金(批准号:29773018)资助

Solvent Effect on the Electrochemical Behavior of Self-assembled Monolayers

SUN Qiao-Yu, ZHANG Xiao-Gang, LI Xiao-Hong, LI Hu-Lin   

  1. College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
  • Received:2000-01-12 Online:2001-10-24 Published:2001-10-24

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被引次数

60

摘要： 用循环伏安法、交流阻抗分析和STM研究了溶剂对自组装单分子膜电化学行为的影响.讨论了以丙酮、二甲基亚砜、乙醇、二甲基甲酰胺和水为溶剂制备的4-羟基-6-甲基-2-巯基嘧啶(HMMP)自组装单分子膜对抗坏血酸(AA)、多巴胺(DA)的电化学行为.结果表明,不同溶剂下制备的单分子膜对AA和DA的催化氧化表现出截然不同的行为;交流阻抗分析定量得出HMMP(丙酮)/Au电极与HMMP(二甲基亚砜)/Au电极的交换电流密度分别为1.14μA/cm2和2.04μA/cm2,电极表面覆盖度分别为93.2%和96.2%,STM图象显示出以丙酮和二甲基亚砜为溶剂制备的单分子膜具有不同的致密性和有序性.

关键词: 溶剂影响, 自组装膜, 电化学行为, 抗坏血酸, 多巴胺

Abstract: The electrodes modified with 4-hydroxy-2-mercapto-6-methylpyrimidine(HMMP) monolayers were prepared in solvents acetone, dimethyl sulfoxide(DMSO), ethanol, dimethyl formamide(DMF) and water respectively, and their electrochemical behavior for ascordic acid and dopamine were studied by cyclic voltammetry, impedance spectroscopy and STM. The results confirmed that the solvent molecules could be trapped in the monolayers during the process of self-assembly, and the monolayers prepared with different solvents showed a different electrochemical behavior in electrocatalytic oxidation to ascordic acid and dopamine. By the impedance analysis, exchange current density and coverage of HMMP(Acetone)/Au electrode and HMMP(DMSO)/Au electrode were 1.14, 2.04 μA/cm2 and 96.2%, 93.2%, respectively. STMimages showed that the monolayers prepared with acetone and DMSOas solvent possessed different degrees of order and compactness.

Key words: Solvent effect, Selfassembledmonolayers, Electrochemical behaviour, Ascordic acid, Dopamine

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