Voltammetric electrodes coated with carboxyl latex particles

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• 作者：Koichi Aoki ; ^{kaoki@u-fukui.ac.jp} ; Tianbao Li ; Jingyuan Chen ; Toyohiko Nishiumi
• 关键词：Colloidal suspensions ; Interaction with carboxyl groups ; Latex films ; Voltammetry of ferrocenyl derivative
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2008
• 出版时间：1 February 2008
• 年：2008
• 卷：613
• 期：1
• 页码：1-8
• 全文大小：656 K

文摘

Electrochemical properties at the carboxyl latex-coated electrode were examined in the context of accumulation or blocking of redox species in solution. The latex suspension was synthesized by copolymerization of styrene with acrylate, and was composed of spherical particles 0.27 ¦Ìm in diameter. The deionized suspension showed iridescence. The latex particles were adsorbed strongly on a glass and a platinum surface in a two-dimensionally crystallized layer. One particle had 7.9 ¡Á 10⁵ carboxyl groups, which were distributed in the inside of the particle at average concentration of 0.14 M. The latex-coated electrode was electrochemically active for the redox reactions of (ferrocenylmethyl)trimethyl ammonium (FcTMA) and in aqueous solution. The voltammetric currents of FcTMA at pH more than 4 were larger than those without the film, whereas those at pH less than 3 were slightly smaller. The peak current was diffusion-controlled of FcTMA. The accumulation and the blocking were explained quantitatively in terms of Donnan equilibrium of FcTMA with immobilized carboxyl groups, depending on the dissociation constant of the carboxyl group, concentration of salt and pH.