Photo-induced Chemiluminescence in-situ with Co2+-doped TiO2 Nanoparticle as Photo-catalytic Oxidant and Its Application

The superoxide anion was produced on the surface of Co2+-doped TiO2 nanoparticles by the photo-induced effect and the characteristics of adsorption and desorption of the superoxide anion on the surface of these nanoparticles were studied. The desorption superoxide anion, photogenerated oxidant, may diffuse through the electric double layer formed on the surface of these nanoparticles into the solution and react with luminol in the solution to produce chemiluminescence (CL). Therefore, this photo-induced chemiluminescence (PCL) signal on the surface of such nanoparticles had the time and space resolved performances with the nanoparticle as a photo-catalytic oxidant due to the hysteresis property of CL reaction. Based on these findings, not only a novel PCL method in situ was developed, but also a new idea of regulating CL based on nanotechnology was proposed. Under the optimum experimental conditions, the enhanced PCL signal was linear with glibenclamide concentration in the range of 2.0 X 10(-8)similar to 1.0 X 10(-6) g.mL(-l) and this new PCL method offered a 6 X 10(-9) g.mL(-1) detection limit for glibenclamide.