【摘 要】
：
TiO2 nanopowders with different nitrogen (N) dopant concentrations were first synthesized by sol-gel method.XRD,TEM,HRTEM,XPS,UV-vis DRS were used to characterize the effects of N doping on the microstructures and optical properties of TiO2.The results in
【机 构】
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College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
【出 处】
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武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
TiO2 nanopowders with different nitrogen (N) dopant concentrations were first synthesized by sol-gel method.XRD,TEM,HRTEM,XPS,UV-vis DRS were used to characterize the effects of N doping on the microstructures and optical properties of TiO2.The results indicated that the prepared TiO2 only contained anatase phase with a slight distortion,and the N doping improved the dispersity of TiO 2.The N doping leaded to more defects in TiO2,capturing the charge carriers and inhibiting the combination of electrons and holes.Also,the N-doped TiO2 was composed of Ti,O and N.Further,N was doped into the TiO2 lattice by substituting for O,forming the oxidized nitrogen in the form of Ti-N-O or Ti-O-N bond,and Ti was present in the form of Ti4+ in TiO2.Finally,the absorbance of N-doped TiO2 was obviously improved in both UV and visible light region.Optical absorption edges of N-doped TiO2 samples showed obvious red shift,which expanded spectral absorption range of TiO2 and improved the utilization efficiency of visible light.It is concluded that N element was successfully doped into TiO 2 crystal lattice,and the N dopant concentration of 3.0％ was designed to modify TiO2.
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