Enhanced Anodic Electrochemiluminescence of Dissolved Oxygen with 2-(Dibutylamino) ethanol at TiO2 Nanoparticles Modified Platinum Electrode for Dopamine Detection

The anodic electrochemiluminescence (ECL) of dissolved oxygen with 2-(dibutylamino) ethanol (DBAE) on platinum electrode has been reported previously by our group. Interestingly, the ECL intensity can be greatly amplified at TiO2 nanoparticles modified platinum electrode (TiO2/Pt), which is due to the catalytic effect of TiO2 nanoparticles to electrochemical oxidation of DBAE. It is the first case to obtain the enhanced ECL from luminophor by electrochemical catalysis of co-reactant. The enhanced anodic ECL intensity can be quenched by dopamine sensitively. And the ECL intensity versus the logarithm of concentration of dopamine was linear over the 4.0 x 10(-12)-1.8 x 10(-8) M (R-2 = 0.9957), with the limit of detection of 2.7 x 10(-12) M (S/N= 3).