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Issue 2, 2002
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Study of surfactant adsorption onto electropolymerized o-phenylenediamine film by using a capacitive sensing method

Fan Yin,ab  Yili Zhu,c  Qingji Xie,a  Youyu Zhang,a  Lihua Niea  and  Shouzhuo Yao*a 
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* Corresponding authors

a College of Chemistry and Chemical Engineering, Hunan University, Changsha, P. R. China
E-mail: yf641118@263.net
Fax: +86 731 8865515

b Department of Biology and Chemistry, Changshu College, Changshu, P. R. China

c Department of Foreign Language, Changshu College, Changshu, P. R. China

Abstract

A capacitive sensing device has been designed by using electropolymerized o-phenylenediamine (PPD) film as an isolating layer and has been applied successfully to study the adsorption of Tween 80 onto the PPD film surface. The PPD was prepared with a cyclic voltammetry method and the thickness of the PPD film was estimated as about 110 ± 10 nm. The properties of the PPD insulating film were characterized with an electrochemical impedance method. The results show that the equivalent circuit model of this device is Randles type. The adsorption process of Tween 80 onto the PPD film was detected with the electrochemical impedance method. The result implies that the adsorption model of Tween 80 onto the PPD film appeared as pseudo Langmuir type and the adsorption equilibrium constant was 213.87 (dm3 g−1). We expect that the capacitive sensor will be a useful tool for investigation of interface action.

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Publication details

The article was received on 11 Sep 2001, accepted on 23 Oct 2001 and first published on 04 Jan 2002


Article type: Paper
DOI: 10.1039/B108106C
Citation: Analyst, 2002,127, 262-266
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    Study of surfactant adsorption onto electropolymerized o-phenylenediamine film by using a capacitive sensing method

    F. Yin, Y. Zhu, Q. Xie, Y. Zhang, L. Nie and S. Yao, Analyst, 2002, 127, 262
    DOI: 10.1039/B108106C

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