钨酸铋/还原氧化石墨烯二氧化氮传感器的研制

Development of bismuth tungstate/reduced graphene oxide nitrogen dioxide gas sensor

通过一步水热法合成了钨酸铋/还原氧化石墨烯(Bi_(2)WO_(6)/rGO)复合材料,并基于此材料制备了NO_(2)气体传感器。用X射线衍射光谱、拉曼光谱、扫描电镜和透射电镜对复合材料的晶相、形貌和微观结构进行的表征表明,Bi_(2)WO_(6)和rGO成功复合,且获得了具有花状超结构的Bi_(2)WO_(6)/rGO复合材料。将复合材料负载到叉指电极上制备了NO_(2)气体传感器,利用自制的气敏测试装置对气体传感器的气敏性能进行了系统测试。结果表明,Bi_(2)WO_(6)/rGO复合气体传感器在室温下对NO_(2)气体具有较高选择性、较高响应值和较好长期稳定性,对质量浓度为47.03 mg/m^(3)NO_(2)的响应值为28.35%,是纯rGO气体传感器的3.5倍,响应时间为55 s,恢复时间为549 s,对NO_(2)的检出限为62μg/m^(3)。

The bismuth tungstate/reduced graphene oxide(Bi_(2)WO_(6)/rGO)composite material was synthesized by a simple and one-step hydrothermal method,and the nitrogen dioxide gas sensor was prepared based on this material.The crystal phase,morphology and microstructure of composite were studied by XRD,Raman spectra,SEM and TEM,respectively,which confirmed that composite of Bi_(2)WO_(6)and rGO was successfully synthesized,and Bi_(2)WO_(6)/rGO composite material with flower-like superstructure was obtained.The composite material was loaded on the interdigital electrode to prepare the nitrogen dioxide gas sensor,while the properties of gas sensor were systemically investigated by using homemade gas-sensing test device.The results indicated that the Bi_(2)WO_(6)/rGO composite gas sensor had higher selectivity,higher response value and better long-term stability.The response value of Bi_(2)WO_(6)/rGO composite gas sensor was 28.35%towards 47.03 mg/m^(3)NO_(2),which was 3.5 times of pure rGO gas sensor.The response time was 55 s with the recovery time of 549 s and the detection limit of 62μg/m^(3).