基于SnO2中空纳米球的低温氢气传感器的研究

Low Operating Temperature Hydrogen Sensor Based on SnO2 Hollow Nanospheres

采用水热法一步合成SnO2纳米材料,采用XRD、SEM、TEM和氮吸附-脱附对材料的结构和形貌进行表征。表征结果表明所制备SnO2纳米材料是由直径150~200 nm的中空纳米球组成,且具有较大比表面积(82.6 m2/g)。采用丝网印刷技术将SnO2气敏浆料涂覆到叉指电极上,制成厚膜型气体传感器器件,研究其对氢气的气敏性能。结果表明SnO2中空纳米球在较低温度(200℃)下对5~200μl/L氢气具有较高的响应值及较快的响应速度,这归因于所制备的SnO2材料的中空结构和较大比表面积,利于氢气气体的吸附与扩散。

SnO2 nanomaterial was synthesized by a simple one-step hydrothermal method and the structure and morphology of the material was characterized by XRD,SEM,TEM and nitrogen adsorption-desorption.The results show that the prepared SnO2 nanomaterial is composed of hollow nanospheres with a diameter of 150~200 nm and has a large specific surface area(82.6 m2/g).The SnO2 gas sensitive paste was applied to the interdigital electrode by screen printing technology to form thick film gas sensing elements,and the gas sensing properties of the elements toward hydrogen were studied.The results show that SnO2 hollow nanospheres have high response value and fast response speed to hydrogen ranging from 5 to 200 μl/L at a low temperature(200℃).This is attributed to the hollow structure and large specific surface area of the prepared SnO2 material,which facilitates the adsorption and diffusion of hydrogen gas.