Sn掺杂的纳米TiO_2的拉曼散射

本文主要利用拉曼光谱研究一组在合成过程中掺入了不同浓度锡的纳米二氧化钛样品,确定其从锐钛矿结构到金红石型结构的转变,进而分析其金红石型结构的形成。拉曼光谱测试表明,晶型导向剂SnO2的引入促使金红石型TiO2在较低的反应温度下形成,高温合成条件的免除使我们获得了很好的纳米级的金红石型TiO2晶体。此晶体具有有趣的包覆型结构,金红石型TiO2纳米晶体内包含着同结构的SnO2籽晶。分析其成因,在结晶过程中,掺入的杂质原子Sn4+与O2-结合,先沉积出金红石型结构的SnO2作籽晶,金红石型结构的SnO2和同样结构的TiO2晶格常数十分接近,促使了TiO2在它表面外延生长,形成金红石结构的包覆纳米晶。

Raman Scattering of Nanocrystalline TiO_ 2Doped with Sn

By using Raman spectroscopy, we analyze the transformation of the nanocrystalline TiO 2from Anatase phase to Rutile phase depending on increasing concentration of Sn doping. Attributed to such a doping technique, much lower temperature is required for the crystallization of Rutile, and so that the nanocrystalline TiO 2with fairly pure structure of Rutile is easy to get, which is likely to have grown as epilayer of SnO 2coin crystal.