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題 名 | Studies of Adsorption Kinetics and Defects of Self-assembled Thiol Monolayers on Gold by Capacitance Plane Plot |
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作 者 | 郭敏; 刁鵬; 童汝亭; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 47:6 2000.12[民89.12] |
頁 次 | 頁1197-1203 |
分類號 | 468 |
關鍵詞 | 交流阻抗頻譜; 自組裝薄膜; 循環伏安法; Complex capacitance; Capacitance plane plot; Ac impedance spectroscopy; Self-assembled monolayer; Cyclic voltammetry; |
語 文 | 英文(English) |
英文摘要 | The capacitive property of an electrode/electrolyte interface can be described by complex capacitance. The capacitance plane plots (CPPs) of ideal polarized and kinetic controlled electrodes are derived based on the concept of complex capacitance. By using CPPs, the capacitance of electrode/electrolyte interface can be conveniently determined. In this work, CPPs obtained in ac impedance experiments are employed for the first time in studying the kinetics of adsorption process of the thiol monolayer. The coverage of octadecanethiol (ODT) monolayer on gold is examined as a function of adsorption time. The adsorption process of ODT molecules on gold exhibits two distinct phases: an initial rapid step followed by a slow one. The simple Langmuir model best explains our experimental data in the initial adsorption stage. CPPs and cyclic voltammetry (CV) indicate that, in the initial adsorption step, the ODT monolayer contains defects whose number decreases with the increasing of adsorption time. |
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