采用水热法合成WO3纳米片,利用扫描电镜(SEM)和X射线衍射仪(XRD)对WO3纳米片的形貌特征和结构性能进行表征,并进一步系统地考察了利用WO3纳米片制备的传感器的气敏性能.结果表明,合成的WO3纳米片尺寸规则,边长在200～300 nm,厚度在50 nm左右,结晶性好.以WO3纳米片为材料制备的气体传感器的最佳工作温度为300℃,在此工作温度下,WO3纳米片传感器对乙醇表现出超快的响应(2～4 s)和恢复时间(4～16 s).与其他还原性气体如甲醇,苯、二氯甲烷和正己烷对比检测发现,WO3纳米片传感器对乙醇表现出高的灵敏度和选择性,表明WO3纳米片在乙醇检测气体传感器方面具有极大的应用潜力.
WO3 nanoplates were synthesized by a hydrothermal method.Morphology and structure of the WO3 nanoplates were analyzed by SEM and XRD,respectively.Gas sensing properties of the as-prepared WO3 sensor were investigated by a static gas-sensing system.The results show that the WO3 nanoplates reveal good crystallinity with mean edge length of 200～300 nm and wall thickness of about 50 nm.The optimal operating temperature of the WO3 sensors is 300 ℃.At this operating temperature,the WO3 sensor exhibits ultra-fast response (2～4 s) and fast recovery time (4～16 s) for ethanol detection,and high selectivity to other gases such as methanol,benzene,dichloromethane and hexane,which indicates its excellent potential application as the gas sensor for ethanol detection.
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