火焰化学气相沉积法制备氮掺杂纳米TiO_2研究

用火焰化学气相沉积法,分别以氨气为氮源、TiCl4为TiO2前驱体,在丙烷-空气湍流火焰中氧化制备氮掺杂纳米TiO2颗粒,以及用TiCl4为TiO2前驱体,在丙烷-空气湍流火焰中氧化制备纳米TiO2颗粒,然后在管式炉中,在氨气的环境下高温煅烧制备氮掺杂纳米TiO2颗粒。利用X射线衍射仪、紫外可见光谱仪、透射电子显微镜、X射线光电子能谱等分析方法对两种方法所制备的样品进行表征。结果表明:在相同的氨气流量下,火焰化学气相沉积法直接制备的氮掺杂纳米TiO2颗粒在波长400～500 nm的可见光的吸收强度大,氮掺杂量多。

Research on Nitrogen Doped TiO2 Nano-particles Prepared by Flame Chemical Vapor Deposition

The flame chemical vapor deposition(CVD) method was used to prepare TiO2 nano-particles using ammonia gas as nitrogen source,TiCl4 as the precursor of TiO2,the oxidation of titanium tetrachloride(TiCl4) in propane-air turbulent flame.First,TiCl4 was used as the precursor of TiO2 to prepare TiO2 nano-particles in propane-air turbulent flame.Then,the N-doped TiO2 nano-particles were calcined in the ambience of ammonia under high temperature in tube furnace.The samples prepared by the two methods were investigated by X-ray diffraction,UV-Vis spectrometer,transmission electron microscopy,X-ray photoelectron spectroscopy.The results showed that the N-doped TiO2 nano-particles directly prepared by CVD method had high absorbance in the range of 400～500 nm and more amount of nitrogen doping under the same flow rate of ammonia.