Abstract
The effects of N-doping on the bead milling dispersion behaviors and optical properties of anatase TiO2 nanoparticles have been investigated and compared with those of bare TiO2. N-doped TiO2 nanoparticles were prepared by mixing anatase powder with urea, and heating the mixture at 800°C for 3 h. The nitrogen elements in the N-doped TiO2 samples were confirmed by Raman analysis. The N-doped TiO2 nanoparticles were then dispersed by bead milling with small beads (15μm) in diglyme using APS as a dispersing agent. The resulting N-doped TiO2 nanoparticles were transparent and colorless suspensions, whereas the dispersed bare TiO2 nanoparticles were yellow. The formation of colorless suspensions by the N-doping process was investigated using a model of the interaction of the N-doped TiO2 surface with the adsorbed dispersant.
