摘要
采用溶胶-凝胶法,通过控制凝胶阶段的温度,制得不同凝胶时间下掺杂Co的TiO2粉末(Co/TiO2),并用X射线衍射仪和可见分光光度仪对其进行表征和分析。结果表明:随温度的升高,凝胶时间缩短;在30℃与40℃之间,凝胶时间有一突跃,在30℃时,凝胶时间为24 h,在40℃时,凝胶时间却只有80 min;凝胶时间大于80 min时,金红石相体积分数大于84%,凝胶时间缩短到20 min时,金红石相体积分数为44%;合理调整凝胶时间可以控制锐钛矿相向金红石相的转变;不同凝胶时间下制备的Co/TiO2粉末的光谱吸收范围明显不同,当凝胶时间为40 min时,Co/TiO2粉末的光谱吸收范围最大,锐钛矿相和金红石相的粒径尺寸最小。
By controlling the temperature of gel phase, Co-doped TiO2 powders under different gel time were prepared through Sol-Gel method. The structure and absorption spectra of the samples were characterized and analyzed by UV-Vis and XRD. The results show that temperature is the main factor affecting gel time, that is, gel time decreases with temperature increasing. There is a sharp transition point between 30 ℃ and 40 ℃. For instance, the gel time is 24 h when the gel temperature is 30 ℃, and the gel time is only 80 min at 40 ℃. As the gel time is greater than 80 min, the content of rutile phase is over 84%. As gel time is reduced to 20 min, the content of rutile phase is 44%. Therefore, different gel time impacts phase transition of TiO2 from anatase to rutile, and Co-doped TiO2 powders have a bigger range of spectral absorption in the visible area without exception. The results show that when the gel time is 40 min, Co-doped TiO2 powder has the biggest spectral absorption range, and the particle size of anatase and rutile phase is the smallest.
出处
《钛工业进展》
CAS
2010年第3期19-22,共4页
Titanium Industry Progress
基金
陕西省自然科学基金项目(2009JM2007)
作者简介
杨晶华（1982-），男，研究生，电话：13572507542，E-mail：zhihua．zhihua@yahoo．com．cn。
