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NANOSIZE EFFECT IN TiO_2 POROUS NANOSTRUCTURES

机译:TiO_2多孔纳米结构中的纳米效应

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Structural properties of TiO_2 nanostructured porous materials are studied by using Raman spectroscopy and X-ray diffraction (XRD). TiO_2 aerogels have been thermally treated at temperatures ranging between 400 and 525℃, where anatase crystalline phase was found. Different aerogel nanoarchitectures made up from nanoparticles with mean size between 7.62 and 12.87 nm, as obtained from XRD, have been further investigated by Raman spectroscopy. It was found that the intensity, position, full width at half maximum (FWHM) and asymmetry of the most intense TiO_2 anatase Raman bands, i.e. 144 and 638 cm~(-1), are influenced by nanoparticles dimension. These spectral changes were discussed in terms of nanosize effect. This effect was found to be more pronounced for the smallest nanoparticles.
机译:利用拉曼光谱和X射线衍射(XRD)研究了TiO_2纳米结构多孔材料的结构性能。 TiO_2气凝胶已在400至525℃的温度范围内进行了热处理,在该温度下发现了锐钛矿晶相。由XRD获得的由平均粒径在7.62至12.87 nm之间的纳米颗粒组成的不同气凝胶纳米结构已通过拉曼光谱进行了进一步研究。研究发现,纳米粒子的尺寸影响着TiO_2锐钛矿型Raman最强带的强度,位置,半峰全宽(FWHM)和不对称性,即144和638 cm〜(-1)。这些光谱变化是根据纳米尺寸效应进行讨论的。对于最小的纳米颗粒,发现这种作用更为明显。

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