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Study on surface acid-base property of carboxylic acid-terminated self-assembled monolayers by cyclic voltammetry and electrochemical impedance spectroscopy

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Chinese Journal of Chemistry 2000年第6期18卷 863-867页

作者：罗立强程志亮杨秀荣汪尔康 Laboratory of Electroanalytical Chemistry and National Analytical Research Center of Electrochemistry and Spectroscopy Changchun Institute of Applied Chemistry Chinese Academy of Sciences ChangchunJilin 130022 China

Cyclic voltammetry and electrochemical impedance spectroscopy were used to study the surface acid-base property of carboxylic acid-terminated self-assembled monolayers (SAMs). A carboxylic acid-terminated thiol, such as thioctic acid (l,2-dithiolane-3-pentanoic acid), was self-assembled on gold electrodes. Electron transfer between the bulk solution and the SAM modified electrode was studied at different pH using Fe(CN)63? as a probe. The surface pka. of thioctic acid was determined by cyclic voltammetry and electrochemical impedance spectroscopy to be 5.6 ± 0.1 and 5.8 ± 0.1, respectively. The method is compared with other methods of monolayer pka measurement.

关键词： surface pka self-assembled monolayer cyclic voltammetry electrochemical impedance

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surface Dissociation Properties of Short Chain Carboxyl Mercaptan Self-Assembled Monolayers by Impedance Titration

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Wuhan University Journal of Natural Sciences 2007年第3期12卷 522-528页

作者： LIU Chuanyin HU Junfu LU Guanghan Department of Chemistry Yunyang Teachers College Danjiangkou 442700 Hubei China College of Chemistry Huazhong Normal University Wuhan 430079 Hubei China

Impedance titration was used to determine the surface dissociation characteristics of short-chain carboxyl mercaptan self-assembled monolayers （SAMs）. Based on the change of the cyclic voltammetric peak current and the charge-transfer resistance, which was related to pH value of the solution, the surface pka of mercaptoacetic acid（MA）, 3-mercaptopropionic acid（MPA） and ω-mercaptohexanic acid（MHA） self-assembled membranes, with ionic strength being 0.1 mol/L, were determined to be 5.20, 4.80, 7.40, respectively. In addition, factors such as time needed for assembling, structure of monolayers and ionic strength, which effected the surface pka, were studied as well. Such surface pka shifts were sufficiently explained by interactions between interfacial molecules and hydrophobicity.

关键词： impedance titration surface pka self-assembled monolayers mercaptoacetic acid(MA) 3-mercaptopropionic acid (MPA) ω-mercaptohexanic acid(MHA)

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