纳米TiO_2的制备及对三甲胺气体的敏感性能

Preparation of TiO_2 Nanocrystalline and Its Sensitive Property to TMA

用硬脂酸凝胶法制备纳米TiO2材料,并用XRD、TEM、IR对纳米晶的晶型、晶粒大小及形貌进行表征;用XPS分析不同晶型的纳米TiO2表面吸附氧的情况,发现锐钛矿型纳米TiO2比金红石型纳米TiO2有较多的表面吸附氧.检测了不同晶型纳米TiO2对三甲胺(TMA)气体的敏感性能.结果表明锐钛矿型纳米TiO2对TMA有较高的灵敏度.对敏感性能的机理进行了讨论.

TiO2 nanocrystalline material has been synthesized by stearic-acid gel method. The TiO2 crystal species and grains are characterized by XRD. TEM showed that the TiO2 grains are spherical and well dispersed. The results of XPS illustrated that the absorbed oxygen on anatase TiO2 is much more than that on rutile TiO2. The sensitivity of the two species to trimethylamine (TMA) were studied. The results showed that anatase TiO2 has much higher sensitivity to TMA than rutile TiO2. The mechanism of TiO2 sensitivity to TMA was discussed.