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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。
In this paper, we mainly use Raman spectroscopy to study a group of samples doped with different concentrations of tin in the synthesis process to determine the transition from anatase structure to rutile structure, and then analyze the formation of rutile structure. Raman spectroscopy showed that the introduction of the crystal orientation agent SnO2 led to the formation of rutile TiO2 at lower reaction temperature, and the removal of high temperature synthesis conditions allowed us to obtain very good nano-scale rutile TiO2 crystals. The crystal has an interesting cladding structure, and the rutile TiO2 nanocrystals contain the SnO2 seeds with the same structure. In the process of crystallization, the impurity atoms Sn4 + doped with O2- are combined to deposit the rutile-type SnO2 as the seed crystal, and the rutile-type SnO2 and the TiO2 lattice constant of the same structure are very close to each other, prompting TiO2 epitaxially grows on its surface to form a coated nanocrystal with rutile structure.