退火温度对溶胶-凝胶法制备TiO2薄膜的结构和光学特性的影响

摘要

Titanium dioxide films were prepared on silica and quartz substrates by sol-gel dip-coating.These films were subsequently thermally annealed at temperatures for 30min;the structural and optical properties of prepared titanium dioxide films were analysed by X-ray diffraction(XRD),scanning electron microscopy(SEM) and UV-visible spectrophotometer,respectively.The ability to degrade methyl orange of these films was also studied.We found that the crystalline phase of the changed gradually from anatase to rutile as annealing temperature increased,and this transition took place at temperatures ranging from 700 to 800℃.During the transition,titanium dioxide films exhibited good,and no cracks were found even after annealing at 800℃.As annealing temperature increased,the absorption peak of titanium dioxide films had a blue-shifted,resulting in the expansion of absorption range in UV area.Titanium dioxide film prepared by this method and annealed at 800℃ for 30min which contained 31.4wt% anatase showed the highest degradation ratio of methyl orange.%采用溶胶-凝胶浸渍提拉法分别在氧化硅和石英衬底上制备TiO2薄膜,并以不同的退火温度保温30min。通过采用X射线衍射仪（XRD）、扫描电镜（SEM）及紫外-可见分光光度计,对TiO2薄膜的结构和光学性能进行了详细分析,并且进行了对甲基橙的降解实验。研究结果表明,随着退火温度的升高,薄膜的晶相由锐钛矿向金红石转变,转变温度在700～800℃之间。在该转变过程中,薄膜结晶程度良好,800℃时薄膜表面平整无开裂;随着热处理温度的升高,TiO2薄膜的吸收峰蓝移,紫外区吸收范围扩大。在800℃退火时,薄膜中所含锐钛矿TiO2为31.4%（质量分数）。此时薄膜表现出最高的甲基橙降解率。