摘要
采用均匀沉淀和直接沉淀2种方法合成了纳米TiO2,对所得产物进行了透射电镜和粒度分布的测试.结果表明:均匀沉淀法制备的纳米TiO2粒度分布均匀,团聚少,并且粒径较小,大约在20 nm左右,基本呈球形;直接沉淀法制备的纳米TiO2粒度分布不够均匀,团聚现象比较严重,有较大颗粒存在,粒径在40 nm左右,近似呈球形.对均匀沉淀法制得的TiO2前驱物采用不同的灼烧温度和灼烧时间,得到了不同晶型和粒径的TiO2粉体.对相同灼烧温度、不同灼烧时间的TiO2进行了XRD测试.并从均匀沉淀法制备的不同粒径的金红石型纳米TiO2中选取3种不同粒径的样品,进行了表面光电压测试和分析.
Nano-TiO2 powder was synthesized by the direct and homogeneous deposition methods. These methods were compared and the reaction condition of the homogeneous precipitation method was investigated. The nano-TiO2 was characterized by TEM and granularity distribution. The results showed that the granularity of nano-TiO2 prepared by homogeneous deposition method is uniform spherical and few reunited. The granularity is about 20 nm. While the granularity of nano-TiO2 by direct deposition method is not uniform nearly spherical and much reunited. The dimension of it is about 40 nm. The surface photovoltage spectra were studied and reasonably explained.
出处
《辽宁师范大学学报（自然科学版）》
CAS
2009年第2期218-221,共4页
Journal of Liaoning Normal University:Natural Science Edition
基金
国家自然科学基金资助项目(20571037)
辽宁省教委创新团队项目(2007T092)
关键词
纳米TIO2
均匀沉淀法
表征
表面光电压
nanostructure
homogeneous deposition method
characterization
surface photovoltage
