多孔ZnO微米球的制备及其优异的丙酮敏感特性  

Synthesis of porous micro-sphere ZnO and its excellent sensing properties to acetone

作　　者：薄小庆 刘唱白 李海英[1] 刘丽[1] 郭欣[1] 刘震[1] 刘丽丽[1] 苏畅[1] 

机构地区：[1]超硬材料国家重点实验室吉林大学物理学院,长春130012 [2]吉林大学电子科学与工程学院,长春130012

出　　处：《物理学报》2014年第17期230-234,共5页Acta Physica Sinica

基　　金：吉林省科技厅重点科技攻关项目(批准号:20140204027GX);“挑战杯”大学生课外学术科技作品竞赛项目(批准号:450060497053)资助的课题~~

摘　　要：以六水合硝酸锌、尿素为原料,以六亚甲基四胺为表面活性剂,利用水热法合成了多孔氧化锌微米球.通过X射线衍射仪、扫描电子显微镜和吸附仪对样品的结构、形貌、比表面积和孔径进行了表征.利用所得多孔微米球氧化锌制备了气敏元件,并对其气敏特性进行了测试.结果表明:在280℃的工作温度下,表面多孔氧化锌微米球气敏元件对50 ppm的丙酮气体的灵敏度为26.8,响应时间和恢复时间分别约为4 s和10 s,并具有良好的选择性.Porous micro-spheres of ZnO have been synthesized with Zn（NO3）2 .6H2O and urea as the raw materials and hexamine as a surfactant via a hydrothermal method. Structure, morphology, specific surface area, and pore size distribution of ZnO porous micro-sphere are characterized by X-ray diffraction, scanning electron microscopy, and micromeritics AS-AP 2420 apparatus, respectively. Gas sensors are fabricated from the ZnO porous micro-spheres and their gas-sensing properties are measured. The gas sensitivity of sensor samples at different temperatures to acetone gas is examined.Results show that the sensitivity of ZnO porous micro-spheres sensors to 50 ppm acetone gas is 26.8 at 280 ℃, and the response and recovery durations are 4-10 seconds, respectively. Also, the sensor possesses an excelent selectivity for acetone.

关 键 词：水热法 氧化锌 丙酮 气体传感器 

分 类 号：TQ132.41[化学工程—无机化工] TP212[自动化与计算机技术—检测技术与自动化装置]