Fluoride-assisted synthesis of anatase TiO2 nanocrystals with tunable shape and band gap via a solvothermal approach
Fluoride-assisted synthesis of anatase TiO2 nanocrystals with tunable shape and band gap via a solvothermal approach
复制标题
DOI：
10.1016/j.cclet.2016.04.016
复制
发表时间：
2016-12-01
影响因子：
9.1
通讯作者：
Tang, Ai-Wei
中科院分区：
文献类型：
--
作者：
Liu, Zhe-Ming;Peng, Lan;Tang, Ai-Wei
我们开发了一种利用油酸的简单溶剂热方法来制备不同形状的锐钛矿型TiO2纳米晶，通过将NaF的量从0 mmol增加到0.5 mmol，将其从纳米棒调整为纳米椭球体，光学带隙相应地从3.47 eV降低到3.29 eV。然而，当氟化物改为NH4F时，所得TiO2纳米晶体具有锐钛矿相，但由较小尺寸的纳米晶体和纳米棒组成，带隙增加至3.53 eV。 X 射线光电子能谱 (XPS) 结果表明，氟含量随着 NaF 量的增加而增加，这可以解释 TiO2 纳米晶体的形状和光学带隙的变化。此外，不含氟含量使得在NH4F存在下合成的产物的形状变化较小并且光学带隙增加。这一结果可能提供另一种在氟化物的帮助下改变金属氧化物纳米晶体的形状和带隙的方法。 (C) 2016 中国化学会、中国医学科学院药物研究所。由 Elsevier B.V. 出版。保留所有权利。
A simple solvothermal approach employing oleic acid has been developed to prepare anatase TiO2 nanocrystals with different shapes, which were tuned from nanorods to nano-ellipsoids by increasing the amount of NaF from 0 to 0.5 mmol, and the optical band gap decreased from 3.47 eV to 3.29 eV accordingly. However, when the fluoride was changed to NH4F, the resultant TiO2 nanocrystals possessed an anatase phase but were made up of smaller-sized nanocrystals and nanorods, and the band gap was increased to 3.53 eV. The X-ray photoelectron spectroscopy (XPS) results illustrated an increase of fluorine content with an increasing amount of NaF could account for the variation of the shape and optical band-gap of TiO2 nanocrystals. Moreover, the absence of fluorine content brought about less change of shape and increase ofoptical band gap of the product synthesized in the presence of NH4F. This result may offer another way to alter the shape and band gap of metal oxide nanocrystals with the assistance of fluoride. (C) 2016 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.