Abstract: A two⁃dimensional nano flake rutile titanium dioxide (TiO₂) semiconductor material was synthesized under low temperature by hydrothermal method.The effects of HCl concentration on the crystalline phase,crystallinity,morphology,particle size and photoelectric properties of obtained TiO₂ particles are studied using XRD,SEM and SPV.The results indicate that the micron spherical,nanosheets and nanorods rutile TiO₂ particles can be synthesized by controlling the HCl concentration at 3,5,7 mol/L,respectively.Moreover,the photocatalytic performance of obtained rutile TiO₂ particles is further investigated by degradation of rhodamine B. The results show that the activities of micron spherical,nanosheets and nanorods rutile TiO₂ samples are higher than that of traditional rutile TiO₂ sample obtained by calcination method.Compared with micron spherical and nanorods rutile TiO₂ samples,2D nanosheets rutile TiO₂ sample has better photocatalytic properties.SPV results reveal that the 2D nanosheets rutile TiO₂ has a significant efficiency on photogenerated charges separation and migration.

摘要： 采用水热法，低温条件下合成了二维纳米片状的金红石二氧化钛(TiO₂)半导体材料，利用X射线衍射(XRD)、扫描电子显微镜(SEM)和表面光电压谱(SPV)研究了反应过程中HCl浓度对TiO₂材料的晶相、结晶性、形貌、粒径和光电性能等性质的影响。结果表明，HCl浓度为3、5、7 mol/L时分别合成了微球、纳米片和纳米棒状的金红石TiO₂；上述3种形貌的金红石TiO₂均显示了高于采用焙烧法得到的金红石TiO₂的光催化降解罗丹明B活性；与微球和纳米棒结构相比，纳米片金红石TiO₂具有更加优异的光催化性能。SPV结果表明，纳米片金红石TiO₂具有更高的光生电荷分离和迁移效率。

关键词: 二维纳米片, 金红石TiO₂, 光催化, 罗丹明B