氧化铟微球的制备及其对异丙醇的气敏特性

Fabrication of the Indium Oxide Microsphere and Its Gas Sensing Properties to Isopropanol

采用水热法合成了氧化铟(In_2O_3)微球结构。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)表征分析In_2O_3样品的晶相、元素种类和微观形貌。测试结果表明:合成的In_2O_3为空心的微球结构,且其平均直径约1μm。同时,制备了基于In_2O_3的气体传感器,并对异丙醇的气敏特性进行研究。实验结果表明:在最佳工作温度(300℃)条件下,该气体传感器对体积分数为10-4异丙醇气体的响应可达10.3,响应时间和恢复时间分别为2 s和7 s,且最低检测极限为5×10-7。最后,讨论了In_2O_3材料对异丙醇的气敏机理。

Indium oxide（In_2O_3）microsphere structures were synthesized by the hydrothermal method.The X-ray diffraction（XRD）and scanning electron microscope（SEM）were introduced to investigate and analyze the crystal phase,element composition and microtopography of the asprepared In_2O_3 samples.The results show that the mean diameter of the synthesized In_2O_3 hollow microsphere structures is about 1μm.Meanwhile,the In_2O_3-based gas sensor was prepared,and the gas sensing experiments were conducted on the In_2O_3 hollow microsphere for isopropanol detection.The measured results exhibit that the response of the gas sensor to isopropanol can reach to 10.3 with the volume fraction of 10-4 under the optimum operating temperature（300 ℃）.Moreover,the response time and recovery time are 2 s and 7 s,and the minimal detection limit is as low as 5×10-7.Finally,the gas sensing mechanism of In_2O_3 materials to isopropanol was discussed.