Crystalline phase transformation of electrospinning TiO2 nanofibres carried out by high temperature annealing
Crystalline phase transformation of electrospinning TiO2 nanofibres carried out by high temperature annealing
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DOI：
10.1016/j.molstruc.2019.05.092
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发表时间：
2019-10-15
影响因子：
3.8
通讯作者：
Sanchez-Ramirez, J. F.
中科院分区：
文献类型：
--
作者：
Secundino-Sanchez, O.;Diaz-Reyes, J.;Sanchez-Ramirez, J. F.
本文报道了电纺丝二氧化钛纳米纤维在高温退火下的结晶相变。利用能谱仪（EDS）测定了纳米纤维的化学化学计量，发现TiO2晶体相变是由氧空位生成引起的。在100 ~ 1000℃的温度范围内，TiO2纳米纤维的直径变化范围为137.0 ~ 115.3 nm。通过拉曼散射和x射线衍射证实了TiO2纳米纤维由纯锐钛矿结构转变为纯金红石结构，包括准非晶相和锐钛矿-金红石混合相。拉曼光谱显示，随着形成纳米纤维的晶体尺寸的增大，拉曼光谱的带展宽和移动表现出异常行为。通过x射线衍射发现，纳米纤维的晶相以锐钛矿（101）和金红石（110）为优先生长方向。(C) 2019 Elsevier B.V.版权所有
In this work reports the crystalline phase transformation of electrospinning TiO2 nanofibres by annealing at high temperatures. The nanofibres chemical stoichiometry was determined by Energy-dispersive Xray spectroscopy (EDS), which allowed find that the TiO2 crystal phase transformation is caused by oxygen vacancy generation. The TiO2 nanofibres diameter varied from 137.0 to 115.3 nm in the temperature range of 100-1000 degrees C, which was estimated by Scanning Electron Microscopy. The TiO2 nanofibres structural transformation from pure anatase to pure rutile structures, including the quasiamorphous and anatase-rutile mixed phases has been confirmed by Raman scattering and X-ray diffraction. The Raman spectroscopy exhibits the anomalous behaviour for band broadening and shifting of Raman bands with increasing crystallite size that form the nanofibres. By X-ray diffraction was found that the nanofibres crystalline phases present as preferential growth direction (101) for anatase and (110) for rutile. (C) 2019 Elsevier B.V. All rights reserved.