用于NO_(2)传感器的NiO@C复合材料性能研究

Performance research on NiO@C composite materials used in NO_(2) sensor

采用超声诱导方式合成出层状前驱体Ni-MOFs-Layer,通过前驱体在N2氛围下热解制备出NiO@C材料。通过XRD、SEM、TEM、Raman等表征方法对样品形貌、晶体结构进行表征,证明了制备的NiO@C继承了前驱体的层状结构,每层是由石墨化碳包裹NiO形成具有核壳结构的碳球堆积而成,并且NiO颗粒分布均匀。将NiO@C材料涂覆在MEMS微热板叉指电极制作成传感器测试探头用于NO_(2)气敏性能测试。结果表明:传感器可以实现对NO_(2)在(1~100)×10^(-6)的宽量程检测,并且具有很好的抗湿能力和稳定性。并且验证了当气氛中存在NH_(3)、CO、乙醇的干扰下,可以实现NO_(2)选择性检测。

The layered precursor Ni-MOFs-Layer is synthesized by ultrasonic induction mode, and NiO@C material is prepared by pyrolysis of the precursor in N2atmosphere.The morphology and crystal structure of the samples are characterized by XRD,SEM,TEM,Raman and other characterization methods.It is proved that the prepared NiO@C inherits the layered structure of the precursor, and each layer is formed by carbon spheres with core-shell structure wrapped by graphitized carbon, and the NiO particles are evenly distributed.The NiO@C material is coated on the interdigital electrode of MEMS micro-hot plate to make a sensor test probe for testing NO_(2) gas sensitive property.The results show that the sensor can detect NO_(2) in a wide range of(1~100)×10^(-6),and has outstanding humidity resistance characteristic and stability.It is also verified that the selective detection of NO_(2) can be realized with NH_(3),CO and ethanol interfere in the atmosphere.