title: Copper hexacyanoferrate multilayer films on glassy carbon electrode modified with 4-aminobenzoic acid in aqueous solution.
abstract: 4-Aminobenzoic acid (4-ABA) was covalently grafted on a glassy carbon electrode (GCE) by amine cation radical formation during the electrooxidation process in 0.1M KCl aqueous solution. X-ray photoelectron spectroscopy (XPS) measurement proves the presence of 4-carboxylphenylamine on the GCE. Electron transfer processes of Fe(CN)(6)(3-) in solutions of various pHs at the modified electrode are studied by both cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Changing the solution pH would result in the variation of the terminal group's charge state, based on which the surface pK(a) values were estimated. The copper hexacyanoferrate (CuHCF) multilayer films were formed on 4-ABA/GCE prepared in aqueous solution, and which exhibit good electrochemical behavior with high stability.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, PR China.
authors.forename: Guocheng
authors.initials: G
authors.lastname: Yang
authors.forename: Yan
authors.initials: Y
authors.lastname: Shen
authors.forename: Mingkui
authors.initials: M
authors.lastname: Wang
authors.forename: Hongjun
authors.initials: H
authors.lastname: Chen
authors.forename: Baifeng
authors.initials: B
authors.lastname: Liu
authors.forename: Shaojun
authors.initials: S
authors.lastname: Dong