Fluoride-assisted synthesis of anatase TiO2 nanocrystals with tunable shape and band gap via a solvothermal approach

A simple solvothermal approach employing oleic acid has been developed to prepare anatase Ti O2 nanocrystals with different shapes, which were tuned from nanorods to nano-ellipsoids by increasing the amount of Na F from 0 to 0.5 mmol, and the optical band gap decreased from 3.47 e V to 3.29 e V acco...

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Bibliographic Details
Published in:中国化学快报：英文版 2016 (12), p.1801-1804
Main Author: Zhe-Ming Liu Lan Peng Ai-Wei Tang
Format: Article
Language:English
Online Access:Get full text
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Summary:A simple solvothermal approach employing oleic acid has been developed to prepare anatase Ti O2 nanocrystals with different shapes, which were tuned from nanorods to nano-ellipsoids by increasing the amount of Na F from 0 to 0.5 mmol, and the optical band gap decreased from 3.47 e V to 3.29 e V accordingly. However, when the fluoride was changed to NH4 F, the resultant Ti O2 nanocrystals possessed an anatase phase but were made up of smaller-sized nanocrystals and nanorods, and the band gap was increased to 3.53 e V. The X-ray photoelectron spectroscopy（XPS） results illustrated an increase of fluorine content with an increasing amount of Na F could account for the variation of the shape and optical band gap of Ti O2 nanocrystals. Moreover, the absence of fluorine content brought about less change of shape and increase of optical band gap of the product synthesized in the presence of NH4 F. This result may offer another way to alter the shape and band gap of metal oxide nanocrystals with the assistance of fluoride.
ISSN:1001-8417
1878-5964