Issue 1, 2005

The enhanced electrochemiluminescence of luminol on the nickel phthalocyanine modified electrode

Abstract

A glassy carbon electrode (GCE) modified with nickel(II) tetrasulfophthalocyanine (NiTSPc) and Nafion® was used for the investigation of the catalytic oxidation of luminol. The modified electrode was found to much more effectively improve the emission of electrochemiluminescence(ECL) of luminol in a solution containing hydrogen peroxide. The enhanced ECL signal corresponded to the catalytic oxidation of both luminol and H2O2 by NiTSPc. Attached Ni(II) on GCE was oxidised to Ni(III) and then used as the catalyst for the chemiluminescence of luminol. The enhanced stability of the ECL signal with Nafion® would mainly result from the prevention of the dissolution of NiTSPc and the adsorption of the oxidation product of luminol on the electrode surface. The proposed method enables a detection limit for luminal of 6.0 × 10−8 mol L−1 to be achieved in the presence of H2O2 in the neutral solution. The enhanced ECL intensity had a linear relationship with the concentration of luminol in the range of 1.0 × 10−7–8.0 × 10−6 mol L−1

Article information

Article type
Paper
Submitted
12 Jul 2004
Accepted
21 Oct 2004
First published
17 Nov 2004

Analyst, 2005,130, 71-75

The enhanced electrochemiluminescence of luminol on the nickel phthalocyanine modified electrode

J. Wang, G. Chen and J. Huang, Analyst, 2005, 130, 71 DOI: 10.1039/B410598B

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