水热法制备钛掺杂二氧化锡微球及其乙醇气敏性研究

Study on Ethanol Sensing Properties of Ti-Doped SnO_2 Microspheres Synthesized by Hydrothermal Method

以SnCl2·2H2O和TiCl4为原料,采用水热法制备钛掺杂SnO2微球。通过X射线衍射仪(XRD)、扫描电镜(SEM)和透射电镜(TEM)对材料的物相和形貌进行表征,并测试材料对乙醇的气敏性。结果表明,所得钛掺杂SnO2微球呈四方金红石结构,钛离子掺入并没有改变SnO2晶体结构,也无新晶相出现;由钛掺杂SnO2微球制得的气敏元件在工作温度350℃条件下,对乙醇有较高灵敏度,如对50 ppm乙醇的灵敏度为2.053,响应时间在10 s内,恢复时间也在3 min内;并对其气敏机理进行了进一步探讨。

The Ti-doped SnO2 microspheres were prepared by hydrothermal method using SnCl2·2H2O and TiCl4 as raw materials. The phase and morphology of the materials were characterized by X-ray diffraction（XRD）,scanning electron microscopy（ SEM） and transmission electron microscopy（ TEM）.The ethanol sensing properties of Ti-doped SnO2 microspheres were evaluated. The results show that the prepared Ti-doped SnO2 microspheres exhibited tetragonal rutile structure and Ti ions doping did not change its crystalline structure without formation of new phases. The gas sensor had an excellent selectivity to ethanol at working temperature of 350 ℃. For example,the sensitivity was 2. 053 ppm to 50 ppm ethanol,and the response and recovery time was 10 s and 3 min,respectively. The mechanism of the Ti-doped SnO2 microspheres has been further studied.