Raman spectroscopy as a morphological probe for TiO2 aerogels
Raman spectroscopy as a morphological probe for TiO2 aerogels
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DOI：
10.1021/jp962747a
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发表时间：
1997-04-03
影响因子：
3.3
通讯作者：
Tomkiewicz, M
中科院分区：
文献类型：
--
作者：
Kelly, S;Pollak, FH;Tomkiewicz, M
我们报告的应用拉曼散射作为探针，以遵循二氧化钛气凝胶的结构演变。我们追踪了142和630 cm（-1）E（g）E_2峰随形态的变化。结果已被分析的q矢量弛豫机制，预测颗粒尺寸和拉曼光谱的功能之间的独特关系。由于声子色散是未知的，我们使用类似的金红石色散。有很好的协议之间的颗粒尺寸从模型和由X-射线衍射测定。我们的研究结果表明，拉曼光谱可以是一个有效的工具，在监测这些气凝胶系统的演变。
We report on the application of Raman scattering as a probe to follow the structural evolution of TiO2 aerogels. We have traced the evolution of the 142 and 630 cm(-1) E(g) anatase peaks as a function of morphology. The results have been analyzed in terms of the q vector relaxation mechanism which predicts a unique relation between particle size and features of the Raman spectra. Since the phonon dispersion of anatase is not known, we have used the analogous rutile dispersion. There is good agreement between the particle sizes evaluated from the model and those determined by X-ray diffraction. Our results demonstrate that Raman spectroscopy can be an effective tool in monitoring the evolution of these aerogel systems.