Novel preparation method of nitrogen-doped TiO 2 hollow particles by the reaction crystallization in refined droplet

Abstract

We succeeded in fabricating the uniform spherical titanium oxide (TiO 2 ) hollow particles improved photocatalytic activity by doping nitrogen under visible light irradiation using new processing. To prepare the uniform spherical nitrogen-doped TiO 2 particles with monodispersed size distribution and monodispersed pore distribution, we performed the reaction crystallization within the confined droplet by inkjet nozzle. The absorption edge of the TiO 2 particles shifted to the lower wavelength side with an increase in the sintering temperature. TiO 2 particles prepared by an inkjet process exhibited spherical porous structures with uniform size distribution, resulting that this process would be controllable to nitrogen-doped TiO 2 particles. The results indicated that the chemical states of the nitrogen doping and the light absorption characteristics of the TiO 2 particles could be controlled by the sintering temperature.