纺丝法制备多级SnO2纳米纤维及其气敏特性研究

摘要

To improve the gas sensing properties of SnO2, using PVP as organic solvent, hierarchical SnO2 nanofibers was synthesized by electrospinning. The SnO2 nanofibers were characterized by X-ray diffraction ( XRD ) , field emission scanning electron microscope ( FE-SEM ) and transmission electron microscopy ( TEM) . A gas sensor was fabricated based on SnO2 nanofibers, of which the gas sensing properties were measured by a static gas test system. The response sensitivity of the SnO2 gas sensor was measured in formaldehyde concentration range of 0. 5~50 ppm at operating temperature of 300 ℃. The SnO2 nanofibers sensor exhibited high response to formaldehyde, quickly response and response recover time and well cross responses. The SnO2 nanofibers based on electrospinning showed good gas sensing properties to formaldehyde.%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．