Water-Assisted Synthesis of Anatase TiO2 Nanocrystals: Mechanism and Sensing Properties to Oxygen at Room Temperature
Water-Assisted Synthesis of Anatase TiO2 Nanocrystals: Mechanism and Sensing Properties to Oxygen at Room Temperature
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DOI：
10.1021/jp800409f
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发表时间：
2008-04
影响因子：
3.7
通讯作者：
Ping Wang;T. Xie;Liang Peng;Haiyan Li;Tongshun Wu;Shan Pang;Dejun Wang
中科院分区：
文献类型：
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作者：
Ping Wang;T. Xie;Liang Peng;Haiyan Li;Tongshun Wu;Shan Pang;Dejun Wang
采用一种简便、快速的方法在低温下制备出了尺寸约为0.2 - 4 nm的高结晶度TiO 2纳米晶。乙二醇用于控制异丙醇钛的水解和缩合速率。在该反应体系中使用的H_2O是生成水相的关键试剂，并且已经证明H_2O的量是快速生成水相的重要参数。根据SEM、TEM、HRTEM、XRD、维斯、FT-IR和TGA测量结果，讨论了可能的反应机理。通过对所合成的纳米晶的传感性能的研究，发现纳米晶在室温下的紫外光照射下对氧气具有快速响应。
High-crystallinity anatase TiO2 nanocrystals with the size of ∼2−4 nm have been prepared by a facile and quick method at low temperature. Ethylene glycol was used to both control the hydrolysis and condensation rates 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-synthesized anatase nanocrystals, it has been found that the nanocrystals exhibit the fast response to oxygen under the UV illumination at room temperature.