Novel preparation method of nitrogen-doped TiO₂ hollow particles by the reaction crystallization in refined droplet

抄録

We succeeded in fabricating the uniform spherical titanium oxide (TiO₂) hollow particles improved photocatalytic activity by doping nitrogen under visible light irradiation using new processing. To prepare the uniform spherical nitrogen-doped TiO₂ 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 TiO₂ particles shifted to the lower wavelength side with an increase in the sintering temperature. TiO₂ particles prepared by an inkjet process exhibited spherical porous structures with uniform size distribution, resulting that this process would be controllable to nitrogen-doped TiO₂ particles. The results indicated that the chemical states of the nitrogen doping and the light absorption characteristics of the TiO₂ particles could be controlled by the sintering temperature.