Water-Assisted Synthesis of Anatase TiO2 Nanocrystals: Mechanism and Sensing Properties to Oxygen at Room Temperature

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• 作者：Ping Wang ; Tengfeng Xie ; Liang Peng ; Haiyan Li ; Tongshun Wu ; Shan Pang ; Dejun Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：May 1, 2008
• 年：2008
• 卷：112
• 期：17
• 页码：6648 - 6652
• 全文大小：342K
• 年卷期：v.112,no.17(May 1, 2008)
• ISSN：1932-7455

文摘

High-crystallinity anatase TiO₂ nanocrystals with the size of ~2-4 nm have been prepared by a facile andquick method at low temperature. Ethylene glycol was used to both control the hydrolysis and condensationrates of titanium isopropoxide. H₂O used in this reaction system, is the key reagent for the anatase formation,and the amount of H₂O has been demonstrated to be an important parameter for the fast anatase phase formation.The plausible reaction mechanism has been discussed on the basis of the results of SEM, TEM, HRTEM,XRD, UV-vis, FT-IR, and TGA measurements. By studying the sensing properties of the as-synthesizedanatase nanocrystals, it has been found that the nanocrystals exhibit the fast response to oxygen under theUV illumination at room temperature.