TiO2/Nafion film based electrochemiluminescence for detection of dissolved oxygen

TiO2 nanocrystals had been modified on the surface of the glassy carbon electrode (GCE) with the help of Nafion. The electrochemiluminescence (ECL) behavior of the TiO2/Nafion GCE in aqueous solution was investigated. A possible mechanism about the ECL of TiO2 had also been proposed. The ECL intensity was linear with the dissolved oxygen concentration in the range of 0.30–10.00 mg/L with a detection limit of 0.12 mg/L. The developed method can be applied to detect the dissolved oxygen concentration or biochemical oxygen demand (BOD).