球状In_2O_3的制备及其对丙酮的气敏特性研究

Fabrication of Sphere-like In_2O_3 and Its Gas Sensing Properties Study for Acetone

采用水热法制备了球状In_2O_3结构。利用XRD、SEM和TEM分析表征合成样品的物相结构和微观形貌。测试结果表明:制备的In2O3为平均粒径为1μm的空心微球结构。同时,研究了In_2O_3气体传感器对丙酮的气敏特性。实验结果表明:该传感器在最佳工作温度(275℃)下,对100 ppm丙酮的响应达到15.3,响应/恢复时间分别为7 s/48 s,且最低检测极限为1 ppm。

Sphere-like In2O3 structures were prepared by hydrothermal method.The phase structures and microtopography ofthe as-synthesized samples were characterized by X-ray diffraction （XRD）,scanning electron microscope （SEM） and transmis-sion electron microscopy （TEM）.The measured results demonstrate that the as-prepared In2O3 are hollow microspherical struc-tures with an average diameter of 1 μm.Meanwhile,the gas sensing experiments were carried out based on In2O3 gas sensor for ac-etone detection.The results indicate that the response of the gas sensor can reach to 15.3 for 100 ppm acetone at the optimum op-erating temperature （275 ℃）,and the response / recovery time is 7 s / 48 s,respectively.Moreover,the minimal concentration ofdetection is as low as 1 ppm.