The enhanced electrochemiluminescence of luminol on the nickel phthalocyanine modified electrode.
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 H(2)O(2) 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 x 10(-8) mol L(-1) to be achieved in the presence of H(2)O(2) in the neutral solution. The enhanced ECL intensity had a linear relationship with the concentration of luminol in the range of 1.0 x 10(-7)-8.0 x 10(-6) mol L(-1).
Wang
Jian
J
Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350002, P.R. China. jwang@fzu.edu.cn
Chen
Guonan
G
Huang
Jinling
J
D002244:Carbon; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D005465:Fluorocarbon Polymers; D007202:Indicators and Reagents / Q000032:analysis*; D008163:Luminescent Measurements; D008165:Luminol / Q000032:analysis*; D009942:Organometallic Compounds
D005465:Fluorocarbon Polymers; D007202:Indicators and Reagents; D009942:Organometallic Compounds; C488300:nickel phthalocyanine tetrasulfonate; C040402:perfluorosulfonic acid; D008165:Luminol; D002244:Carbon