[The study on electrochemiluminescence of luminol on ITO glass]

The indium tin oxide(ITO) glass was applied as the electrode to study the electrochemilumuinescent behavior of luminol on its surface. The experimental results indicated that it was an excellent electrode material for ECL of luminol with very high sensitivity. The detection limit of the luminol is as low as 10(-15) mol x L(-1) order of magnitude. Compared with the voltammetric behavior of luminol, it was revealed that both the two oxidation processes of luminol led to the emission of ECL on the surface of ITO glass,which was different from the ECL behavior of luminol on platinum electrode. Although the ECL intensity of first step oxidation of luminol was relative weak than that of the second step oxidation, it was profitable because it was a reversible process and more stable. It might be useful to fabricate the flow-cell of ECL based on its ECL activity and transparence for light. The influences of the electric parameters and the dissolved oxygen on luminol's ECL on the ITO glass, and the mechanism were also studied in the present paper.