高纯纳米ZnSnO_3气敏材料的制备及气敏性能  

PREPARATION AND PROPERTIES OF ULTRA-PURITY AND NANOSIZED ZnSnO_3 GAS SENSITIVE MATERIAL

作　　者：王中长[1] 刘天模[1] 余龙[1] 利佳[1] 李家鸣 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]国家功能材料工程技术控制中心,重庆400700

出　　处：《硅酸盐学报》2004年第12期1555-1559,共5页Journal of The Chinese Ceramic Society

基　　金：重庆市自然科学基金

摘　　要：用草酸-氨水共沉淀法制备了ZnSnO_3粉体，适当烧结后制备了一种对乙醇具有高灵敏度和高选择性的传感器。用X射线衍射仪和电镜对其成分和形貌进行分析。此外，用DSC-TG检测了草酸-氨水共沉淀法制得的前驱体反应过程，并与其它方法如：固-固反应、氨水反应制备出的粉体作了比较。结果发现：草酸-氨水共沉淀法制备的前驱体，在600℃，30 h热处理后，可以获得高纯纳米ZnSnO_3粉末。由这种粉末经700℃烧结2 h制成的传感器对乙醇的灵敏度可达13.329。在有其它气体共存时，这种气敏传感器对乙醇具有良好的选择性。在30 d的连续检测下，具有很好的稳定性。Zinc tin complex oxide (ZnSnO3) powder was prepared by the coprecipitation method of oxalic acid and ammonia. A sensor with a high sensitivity and selectivity to ethanol was manufactured by using this powder. The composition and morphology of the powder were investigated by means of X-ray diffraction (XRD) and transmission electron microscope (TEM) respectively. Moreover, DSC-TG was also used to follow the whole reaction tracks of coprecipitation of oxalic acid and ammonia. This kind of powder was compared with other kinds of power prepared from other preparation ways such as solid-solid reaction and ammonia reaction. After heat treatment at 600°C for 30 h, a ultra-purity and nanosized ZnSnO3 powder is obtained by using both oxalic acid and ammonia as precipitants at the same time. Moreover, the sensitivity value of the sensor made by sintered at 700°C for 2 h from ZnSnO3 powder can reach to 13.329. An excellent selectivity to ethanol when coexisted with other kinds of gas and the outstanding stability based on continuous measurement for 30 days are obtained for the sensor.

关 键 词：金属基复合氧化物 纳米粉体 制备条件 气敏性能 

分 类 号：TN301[电子电信—物理电子学]