The stable and uniform characteristics of nitrogen in nitrogen doped titanium dioxide nano photocatalytic particles

N doped TiO₂ nano particles were prepared by heating TiO₂ nano particles in NH₃ + C₃H₈ 5vol% atmosphere. The stability and uniformity characteristics of the doped N in the prepared N doped TiO₂ nano particles were studied by X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD). We concluded that the doped N was uniform from the surface to the inside of TiO₂ nano particles and found that the desorption peak of the doped N was more than 900 K in vacuum, showing its high stability and potential of visible light photocatalytic application for N doped TiO₂ nano particles.