文献类型：期刊文献

英文题名：The evolvement of pits and dislocations on TiO₂-B nanowires via oriented attachment growth

作者：Zhao, Bin;Chen, Feng[1];Qu, Wenwu;Zhang, Jinlong

机构：[1]E China Univ Sci & Technol, Adv Mat Lab, Shanghai 200237, CA, Peoples R China; E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, CA, Peoples R China

年份：2009

卷号：182

期号：8

起止页码：2225

外文期刊名：JOURNAL OF SOLID STATE CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000269066400034)】；

基金：This work was supported by the National Nature Science Foundation of China (20777015) and Shanghai Nature Science Foundation (06ZR14025).

语种：英文

外文关键词：Titanium dioxide; One-dimensional nanomaterials; Thermal treatment; Phase transition; Growth mechanism

摘要：TiO2-B nanowires were synthesized by an ion exchanging-thermal treatment. The unique morphology of pits and dislocations interspersed on TiO2-B nanowires were firstly characterized and studied by high-resolution transmission electron microscopy (HRTEM). Oriented attachment is suggested as an important growth mechanism in the evolvement of pits and dislocations on TiO2-B nanowires. Lattice shears and fractures were originally formed during the ion exchanging process of the sodium titanate nanowires, which resulted in the formation of primary crystalline units and vacancies in the layered hydrogen titanate nanowires. Then the (110) lattice planes of TiO2-B grown in [110] direction is faster than the other lattice planes, which caused the exhibition of long dislocations on TiO2-B nanowires. The enlargement of the vacancies, which was caused by the rearrangement of primary crystalline units, should be the reason of the formation of pits. Additionally, the transformation from TiO2-B to anatase could be also elucidated by oriented attachment mechanism. (C) 2009 Elsevier Inc. All rights reserved.