WO_3纳米片的制备、表征及气敏性能研究（英文）

Synthesis,Characterization,and Gas Sensing Properties of WO_3 Nanoplates

采用水热法合成WO_3纳米片,利用扫描电镜(SEM)和X射线衍射仪(XRD)对WO_3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WO_3纳米片制备的传感器的气敏性能。结果表明,合成的WO_3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WO_3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,WO_3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,WO_3纳米片传感器对乙醇表现出高的灵敏度和选择性,表明WO_3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.