水热法制备掺Fe^(3+)纳米TiO_2粉体及其光学行为研究

Hydrothermal synthesisand optical behavior of Fe^(3+) doped TiO_2 nanoparticles

以钛酸丁酯为前驱体,冰乙酸和无水乙醇为溶剂,以Fe(NO_3)·9H_2O为掺杂剂,采用水热法制备出Fe掺杂纳米二氧化钛粉体。通过X射线衍射仪(XRD)、透射电子显微镜(TEM)和紫外-可见分光光度计(UV-Vis)对样品的晶型结构、微观形貌和光学行为等进行表征,研究水热反应温度、时间、Fe^(3+)的掺杂量对TiO_2粉体的影响。结果表明:随着水热处理时间、温度和Fe^(3+)掺杂量的变化,所得粉体均为锐钛矿相TiO_2纳米粉体,没有出现其他杂相。通过掺杂,XRD射线衍射峰强度有所降低,TiO_2晶粒生长受到抑制,晶粒平均粒径为10 nm左右。Fe^(3+)掺杂量为摩尔分数1%时,纳米TiO_2光吸收强度最强。

Using tetrabutyl titanate as the titanium source,the glacial acetic acid and absolute ethanol as solvent,and the Fe(NO3)·9H2O as the dopant,the Fe doped TiO2 nano powders were prepared by the hydrothermal method.The crystal structure,microstructure of the samples were analyzed by X-ray diffraction(XRD)and transmission electron microscopy(TEM),respectively.The optical properties of the samples were measured by ultraviolet visible spectrophotometer(UV-Vis),to study the influence of hydrothermal reaction temperature,time and doping amount of Fe^3+on TiO2 powders.The results indicate that with the change of heat treatment time,temperature and Fe^3+doping amount,the powders are all anatase TiO2 nano powder,and there is no other heterozygous phases.Through doping,the peak intensity of X-ray diffraction is decreased and the grain size of TiO2 is inhibited.The obtained grain size of the grain is about 10 nm.When Fe3+doping amount is 1%(mole fraction),the intensity of TiO2 absorption is the strongest.