金属有机骨架材料ZIF-8(I_2)的湿敏性能

Humidity sensing properties of metal-organic framework materials of ZIF-8(I_2)

采用甲醇为溶剂合成了ZIF-8(分子筛咪唑酯骨架化合物)纳米晶材料,将碘成功掺入其(ZIF-8(I2))孔笼中。并且通过X射线衍射对ZIF-8进行了晶体结构表征,通过扫描电子显微镜对ZIF-8与ZIF-8(I2)进行了晶体形貌的表征。以ZIF-8(I2)为基体材料,采用涂膜法将其涂覆在Ag-Pd叉指电极上,制作成湿敏元件。对元件的湿敏性能进行测试,并且分析了ZIF-8(I2)的感湿机理。结果表明,中高湿条件下,元件阻抗随湿度变化的曲线有良好的线性关系,响应时间仅为25s,湿滞约为7%。

ZIF-8 （zeolitic imidazolate frameworks） nanocrystals were synthesized using methanol as solvent, of which pores were successfully doped in with I2 （ZIF-8（I2））. The crystal structure of ZIF8 was characterized by X-ray diffraction （XRD）, and the morphology of ZIF8 and ZlF-8（I2） was observed by scanning electron microscope （SEM）. Then ZIF-8（I2） humidity sensor was fabricated by coating the nanocrystal materials on Ag-Pd interdigitated electrodes. The device shows a good impedance-RH （rela- tive humidity） relationship, and humidity sensing properties of the sensor based on ZIF-8（I2） were explored. Besides, complex impedance at different RHs was characterized to study sensing mechanism of ZIF-8 （I2）. The results indicate that the materials show high sensitivity at high relative humidity （RH）, response time is 25 s, and humidity hysteresis is about 7 ~.