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Study on surface acid‐base property of carboxylic acid‐terminated self‐assembled monolayers by cyclic voltammetry and electrochemical impedance spectroscopy
Author(s) -
Luo IiQiang,
Cheng ZhiLiang,
Yang XiuRong,
Wang ErKang
Publication year - 2000
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20000180612
Subject(s) - chemistry , cyclic voltammetry , dielectric spectroscopy , monolayer , thioctic acid , self assembled monolayer , carboxylic acid , electrochemistry , electrode , inorganic chemistry , organic chemistry , lipoic acid , biochemistry , antioxidant
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) 6 3− as a probe. The surface p K a . 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 p K a measurement.