Synthesis of octagonal microdisks assembled from anatase TiO2 nanosheets with exposed {001} facets

被引：3
作者：
Hu, XiaoYi [1 ]
机构：
[1] Xiamen Univ, Coll Mat, Xiamen 361005, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2014年 / 40卷 / 09期
关键词：
Electron microscopy; Surfaces; TiO2; Photocatalysis; SOLVOTHERMAL SYNTHESIS; NH4TIOF3; MESOCRYSTALS; FACILE SYNTHESIS; WATER; PERCENTAGE;
D O I：
10.1016/j.ceramint.2014.06.109
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Octagonal TiO2 microdisks constructed orderly from anatase nanosheet building blocks (NSBBs) with exposed {001} facets were synthesized using a facile liquid phase precipitation method combined with subsequent heat treatment. The in-situ generated BF4- and F- adsorbed onto {001} facets of NH4TiOF3 (as precursor of TiO2) decreased the surface energy instead of extremely poisonous and corrosive HF. Polymer surfactant is likely to further stabilize the {001} facets and it may induce NH4TiOF3 nanocrystals as a linkage to align high-orderly by lateral expansion for the formation of NH4TiOF3 mesocrystals. Sintering temperature for the heat treatment of NH4TiOF3 microdisks has a considerable effect on TiO2 microdisks for the extent of exposure of the {001} surface. Symmetrically growths on [100] and [110] directions parallel to the {001} surface are favored which lead to the well-defined octagonal fiat-shape. TiO2 microdisks show an excellent adsorption capacity in dark and enhanced reactive activity under irradiation of UV-light for the degradation of methylene blue, owing to the high-ordered organization of nanosheets and large exposure of high-energy facets. (c) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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收藏
页码：15033 / 15043
页数：11
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