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为了提高SnO2的气敏性能,以PVP为有机溶剂,采用静电纺丝法制备了多级结构的SnO2纳米纤维,利用XRD,SEM和TEM等技术对材料的结构、形貌进行了表征,并制备了SnO2旁热式气敏元件.采用静态气体测试系统对SnO2元件进行了气敏测试.在工作温度300℃时,对0.5~50 ppm甲醛进行了气敏测试.测试结果表明:SnO2气敏元件对甲醛气体具有优异的响应灵敏度,快速的响应及响应恢复特性、较好的选择性.采用静电纺丝制备的多级结构SnO2纳米纤维对甲醛表现出良好的气敏特性.
In order to improve the gas sensitivity of SnO2, SnO2 nanofibers with multi-level structure were prepared by electrospinning using PVP as organic solvent. The structure and morphology of SnO2 nanofibers were characterized by XRD, SEM and TEM. SnO2 next to the thermal gas sensor.Micro gas test system for gas sensing SnO2 components.When the operating temperature is 300 ℃, 0.5 ~ 50 ppm formaldehyde gas was tested.The results show that: SnO2 gas sensor Formaldehyde gas has excellent response sensitivity, rapid response and response recovery characteristics, better selectivity.Using electrospinning prepared multi-level structure of SnO2 nanofibers showed good gas-sensitive properties of formaldehyde.