Electrochemiluminescence sensor based on partial sulfonation of polystyrene with carbon nanotubes

Jing Li; Yuanhong Xu; Hui Wei; Ting Huo; Erkang Wang

doi:10.1021/ac0706224

Electrochemiluminescence sensor based on partial sulfonation of polystyrene with carbon nanotubes

Anal Chem. 2007 Jul 15;79(14):5439-43. doi: 10.1021/ac0706224. Epub 2007 Jun 14.

Authors

Jing Li¹, Yuanhong Xu, Hui Wei, Ting Huo, Erkang Wang

Affiliation

¹ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Changchun, Jilin, P. R. China.

PMID: 17567105
DOI: 10.1021/ac0706224

Abstract

Herein, homogenously partial sulfonation of polystyrene (PSP) was performed. An effective electrochemiluminescence (ECL) sensor based on PSP with carbon nanotube (CNTs) composite film was developed. Cyclic voltammetry and electrochemical impendence spectroscopy were applied to characterize this composite film. The PSP was used as an immobilization matrix to entrap the ECL reagent Ru(bpy)3(2+) due to the electrostatic interactions between sulfonic acid groups and Ru(bpy)3(2+) cations. The introduction of CNTs into PSP acted not only as a conducting pathway to accelerate the electron transfer but also as a proper matrix to immobilize Ru(bpy)3(2+) on the electrode by hydrophobic interaction. Furthermore, the results indicated the ECL intensity produced at this composite film was over 3-fold compared with that of the pure PSP film due to the electrocatalytic activity of the CNTs. Such a sensor was verified by the sensitive determinations of 2-(dibutylamino)ethanol and tripropylamine.