Study on surface acid-base property of carboxylic acid-terminated self-assembled monolayers by cyclic voltammetry and electrochemical impedance spectroscopy |
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| Authors: | LUO Li-Qiang CHENG Zhi-Liang YANG Xiu-RongWANG Er-KangLaboratory of Electroanalytical Chemistry and National Analytical Research Center of Electrochemistry and Spectroscopy Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin China |
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| Institution: | LUO,Li-Qiang CHENG,Zhi-Liang YANG,Xiu-RongWANG,Er-KangLaboratory of Electroanalytical Chemistry and National Analytical Research Center of Electrochemistry and Spectroscopy,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun,Jilin 130022,China |
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| Abstract: | 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. |
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| Keywords: | Surface pKa self-assembled monolayer cyclic voltammetry electrochemical impedance |
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