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Issue 7, 2007
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Enhanced electrochemiluminescence sensor from tris(2,2′-bipyridyl)ruthenium(II) incorporated into MCM-41 and an ionic liquid-based carbon paste electrode

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Abstract

The electrochemiluminescence (ECL) of tris(2,2′-bipyridyl)ruthenium(II) [Ru(bpy)32+] ion-exchanged in the sulfonic-functionalized MCM-41 silicas was developed with tripropylamine (TPrA) as a co-reactant in a carbon paste electrode (CPE) using a room temperature ionic liquid (IL) as a binder. The sulfonic-functionalized silicas MCM-41 were used for preparing an ECL sensor by the electrostatic interactions between Ru(bpy)32+ cations and sulfonic acid groups. We used the IL as a binder to construct the CPE (IL-CPE) to replace the traditional binder of the CPE (T-CPE) – silicone oil. The results indicated that the MCM-41-modified IL-CPE had more open structures to allow faster diffusion of Ru(bpy)32+ and that the ionic liquid also acted as a conducting bridge to connect TPrA with Ru(bpy)32+ sites immobilized in the electrode, resulting in a higher ECL intensity compared with the MCM-41-modified T-CPE. Herein, the detection limit for TPrA of the MCM-41-modified IL-CPE was 7.2 nM, which was two orders of magnitude lower than that observed at the T-CPE. When this new sensor was used in flow injection analysis (FIA), the MCM-41-modified IL-CPE ECL sensor also showed good reproducibility. Furthermore, the sensor could also be renewed easily by mechanical polishing whenever needed.

Graphical abstract: Enhanced electrochemiluminescence sensor from tris(2,2′-bipyridyl)ruthenium(ii) incorporated into MCM-41 and an ionic liquid-based carbon paste electrode

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Publication details

The article was received on 06 Feb 2007, accepted on 30 May 2007 and first published on 08 Jun 2007


Article type: Paper
DOI: 10.1039/B701842H
Citation: Analyst, 2007,132, 687-691
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    Enhanced electrochemiluminescence sensor from tris(2,2′-bipyridyl)ruthenium(II) incorporated into MCM-41 and an ionic liquid-based carbon paste electrode

    J. Li, M. Huang, X. Liu, H. Wei, Y. Xu, G. Xu and E. Wang, Analyst, 2007, 132, 687
    DOI: 10.1039/B701842H

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