WO3纳米片的制备、表征及气敏性能研究

Synthesis, characterization, and gas sensing properties of WO3 nanoplates

摘要:

论文采用水热法合成WO₃纳米片,利用扫描电镜(SEM)和X射线衍射(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。实验结果表明,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 _oC,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秒)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。

Abstract:

WO3 nanoplates are synthesized by a hydrothermal method. Morphology and structure of the WO3 nanoplates are analyzed by SEM and XRD. Gas sensing properties of the as-prepared WO3 sensor are investigated by a static gas-sensing system. The results show the WO3 nanoplates demonstrate 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?C. 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 a gas sensor for ethanol detection.