S Shadmehr - Physics Department, Sharif University of Technology,
N Taghavinia - Institute for Nanoscience and Nanotechnology, Sharif University of Technology

We prepared N-doped TiO2 nanopowders that respond to visible-light by high temperature reaction of TiO2.nH2O, prepared by the hydrolysis of Tetraisopropylorthotitinat and urea. We studied the effect of time and temperature and different weight ratios of urea/TiO2.nH2O and we found that our best sample was the one with 400oc heat treatment for 2h and in this sample the weight ratio of urea/TiO2.nH2O was 1. The absorption edge of the samples shifts toward a longer wavelength (about 550 nm). The nanoparticles had a relative specific surface area of about 51m2gr-1. We have done photocatalytic test for different samples. We used Diffused Reflectance, XRD, SEM, BET and BJH for analysis.

Visible-light response; Titanium dioxide; Nitrogen doping