水热法制备TiO2薄膜及其光学性能

Preparation and optical properties of TiO2 thin films by hydrothermal method

在150℃条件下,以钛酸丁酯为钛源,盐酸和蒸馏水为溶剂,采用水热法通过改变水热反应时间、Ti（OC4H9）4浓度、盐酸和水的比例,在掺F-SnO2玻璃基板上制备TiO2薄膜。通过X射线衍射仪（XRD）、扫描电镜（SEM）、紫外可见分光光度计（UVVis）等对样品的形貌结构进行表征。结果表明：TiO2薄膜由均匀排列的金红石相纳米棒阵列组成,具有良好的结晶度和明显的（002）取向,Ti（OC4H9）4浓度越大,TiO2纳米棒结合的越紧密,样品在紫外光区和可见光区都有良好的光吸收性,浓度为0.05mol/L时禁带宽度最小为2.96 e V;增大盐酸比例,会导致薄膜紫外吸收边带发生蓝移现象。

Under the condition of 150 ℃,TiO2 films were prepared on the F-SnO2 glass substrate by hydrothermal method using tetrabutyl as titanate source,hydrochloric acid and distilled water as solvent,and the influence of the hydrothermal reaction time,the concentration of Ti（OC4H9）4 and the ratio of hydrochloric acid and water on the films was investigated.The phase,microstructure and optical properties of the samples were studied by means of X-ray diffraction（XRD）,scanning electron microscopy（SEM） and ultraviolet visible spectrophotometer（UV-Vis）,respectively.The results show that the TiO2 films are composed of a uniform array of rutile nanorods with good crystallinity and preferred（002） orientation.The higher the concentration of Ti（OC4H9）4 is,the tighter the binding of the TiO2 nanorods is.Besides,the UV-Vis spectra reveal that the samples have good optical absorption ability in UV and visible light region.The minimum band gap of the TiO2 films is 2.96 eV when the Ti（OC4H9）4 concentration is about 0.05 mol/L.When increasing the content of hydrochloric acid,the blue shift phenomenon is observed at the ultraviolet absorption sideband of the films.