在常温下,用射频磁控溅射在石英衬底上沉积厚度约为200nm的Ti02薄膜,使用波长为248nm的KrF脉冲激光器,在不同功率密度下对薄膜样品进行辐照退火处理,并采用x射线衍射(xRD)、拉曼(Raman)、X射线电子能谱(XPS)、原子力显微镜(AFM)、扫描电子显微镜(SEM)、高分辨率扫描隧道显微镜(HRTEM)以及选择区域电子衍射(SAED)、紫外可见分光光度计等方法分析不同激光功率密度退火对Ti02薄膜的结构、表面形貌和透射率等性能的影响。结果表明当激光功率密度为0.5J/cm2时,可获得高质量的锐钛矿TiOe薄膜,当继续增大光功率密度时,Ti02薄膜变为(110)取向的金红石相,其薄膜表面粗糙度也相应增大。
TiO2 thin films of about 200 nm thickness were prepared by RF magnetron sputtering on quartzsubstrates at room temperature, and then annealed by a KrF pulse laser with wavelength 248 nm underdifferent power densities in the air. The effect of laser power density on the characteristics of films was sys-tematically analyzed using X-ray diffractometry (XRD), Raman spectra, X-ray photoelectron spectroscopy(XPS), scanning electron microscopy (SEM), atom force microscopy (AFM), high resolution transmissionelectron microscopy (HRTEM) and selected area electron diffraction (SAED) and UV-vis spectrophotome-ter. The results showed that high-quality anatase TiO2 films can be obtained when the power density was0.5 J/cm2. By increasing the power density continually, TiO2 showed the predominant orientation withrutile phase along (1 1 0) refiection, with roughness of the films increasing.