标题:
水热法制备掺杂钇的二氧化钛及其对甲醛气敏性能研究Study on Synthesis of TiO2 Doped with Yttrium by Hydrothermal Method and the Gas Sensing Properties towards Formaldehyde
作者:
宋金玲, 凡庆南, 周长才, 蔡颖, 张胤
关键字:
水热法, TiO2, TiO2:Y, XRD, 气敏性能Hydrothermal method; TiO2; TiO2:Y; XRD; Gas Sensing Properties
期刊名称:
《Hans Journal of Nanotechnology》, Vol.3 No.4, 2013-11-08
摘要:
本文首先通过溶胶–凝胶法和水热法制备了TiO2粉末和掺杂稀土离子Y的TiO2粉末，并通过X-射线衍射谱(XRD)对制备的样品结构进行了表征，结果表明，制备的TiO2粉末为锐钛矿结构；稀土离子的掺杂抑制了TiO2晶粒生长。其次通过气敏测试仪测试所制备的样品对甲醛的气敏性，结果发现水热法制备的掺杂Y的TiO2(TiO2:Y-HT)对甲醛有较高的灵敏性。并进一步研究了该样品对甲醛浓度的敏感性、响应–恢复时间以及在不同温度下的敏感性，结果显示，最佳操作温度为250℃，随着浓度的增加呈现增加的趋势，响应时间约为30 s，恢复时间约为35
s。In this paper, the TiO2 powder and TiO2 powders doped with yttrium ion have been prepared by
the sol-gel method and hydrothermal methods, and the structures of the samples
have been characterized by the XRD. The results of XRD indicate that the structure
of prepared TiO2 powder is anatase and rare earth ion doping agents
can restrain the growth of TiO2 crystals. Moreover, the formaldehyde
gas sensing properties of the prepared samples have been measured by the gas
sensing instrument. The results show that the TiO2 doped with Y and
prepared by hydrothermal method (TiO2:Y-HT) exhibits better
sensitivity towards formaldehyde. The concentration-sensitivity,
response-recovery time and temperature-sensitivity of TiO2:Y-HT have
been furthermore studied. The results indicate that the best operation
temperature is 250˚C, the sensitivity increases with the increasing of
formaldehyde concentration, the response time is about 30 s, and the recovery
time is about 35 s.