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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。
The WO_3 nanosheets were synthesized by hydrothermal method. The morphology and structure of WO_3 nanosheets were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The effects of WO_3 nanoplatelets The gas sensitivity. The results show that the size of the synthesized WO_3 nanosheet is about 200 ~ 300 nm with a thickness of about 50 nm and good crystallinity. The optimal working temperature of the gas sensor prepared from WO_3 nanosheets was 300 ℃. The WO_3 nanosheet sensor exhibited fast response (2-4 s) and recovery time (4-16) to ethanol at this working temperature s). Compared with other reducing gases such as methanol, benzene, methylene chloride and n-hexane, the WO3 nanosheet sensor showed high sensitivity and selectivity to ethanol, indicating that WO3 nanosheets have great application in the detection of ethanol gas sensors potential.