N-doped TiO2 powers have been prepared using tetrabutyl titanate and urea.The properties of phase/ size/absorbance were characterized by means of X-ray diffraction (XRD),transmission electron microscopy (TEM),UV-Vis absorption spectroscopy.The results indicate that particle size of N-doped TiO2 decreased and the absorption effect increased greatly.In order to prove the experimental results,we studied the doping mechanism using DFT.The band gap has been decreased effectively because of doping.Compared with substitutional Ndoped TiO2,interstitial N-doped TiO2 is more beneficial to the light absorption.
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