Electrochemiluminescent behavior of luminol on the glassy carbon electrode modified with CoTPP/MWNT composite film

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• 作者：Zhenyu Lin ; Jinhua Chen ; Yuwu Chi ; Bin Qui ; Jinming Lin ; Guonan Chen
• 关键词：Cobalt(II) meso-tetraphenylporphrine ; Multiwall-carbon nanotube ; Luminol ; Electrochemiluminescence
• 刊名：Electrochimica Acta
• 出版年：2008
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：20 September 2008
• 卷：53
• 期：22
• 页码：6464-6468
• 文件大小：546 K

摘要

A glassy carbon electrode (GCE) modified with cobalt(II) meso-tetraphenylporphrine/multiwall-carbon nanotube (CoTPP/MWNT) was applied to investigate the electrochemiluminescent (ECL) behavior of luminol. The ECL intensity of luminol was found to be increased greatly on this modified electrode. The presence of cobalt(II) meso-tetraphenylporphrine (CoTPP) can catalyze the reduction of oxygen on the electrode surface to produce HOO⁻, which can increase the ECL intensity of luminol. Moreover, MWNT can provide the more effective area of the electrode, and can act as a promoter to enhance the electrochemical reaction. The proposed method enables a detection limit for luminol of 1.0 × 10⁻⁸ mol/L in the neutral solution. Under the optimum condition, the enhanced ECL intensity of luminol by H₂O₂ had a linear relationship with the concentration of H₂O₂ in the range of 1.0 × 10⁻⁷ to 8.0 × 10⁻⁸ mol/L with the detection limit of 5.0 × 10⁻⁹ mol/L.