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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 zinc oxide microspheres were synthesized by hydrothermal method using zinc nitrate hexahydrate and urea as raw materials and hexamethylenetetramine as surfactant.The structures of the samples were characterized by X-ray diffractometry, scanning electron microscopy and adsorption analysis , Morphology, specific surface area and pore size were measured.The gas sensing element was prepared by using the obtained porous microspheres and the gas sensing properties were tested.The results showed that at the working temperature of 280 ℃, the surface porous zinc oxide Microparticle gas sensors have a sensitivity of 26.8 for 50 ppm of acetone gas and a response time and recovery time of about 4 s and 10 s, respectively, with good selectivity.