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通过静电纺丝技术制备了不同Au掺杂量的ZnO(Au-ZnO)纳米纤维,利用X射线衍射、扫描电镜、透射电镜等对样品的结构和微观形貌进行了表征,并用静态配气法测试了材料的气敏性能。结果表明,经600℃高温煅烧后Au-ZnO纳米纤维仍保持网状结构,由大小不一的ZnO纳米颗粒连结组成,直径为180~230 nm。Au的掺杂有效改善了ZnO纳米纤维的气敏性能,其中1%Au-ZnO(质量分数)纳米纤维在310℃时对甲醛有较高的灵敏度和选择性,响应时间为21~27 s,恢复时间为11~15 s。该材料在甲醛的检测领域有较好的应用前景。
The ZnO nanostructures with different Au doping amount were prepared by electrospinning technique. The structure and morphology of the samples were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The gas sensitivity of the material was tested. The results showed that the Au-ZnO nanofibers still retained the network structure after being calcined at 600 ℃, and consisted of ZnO nanoparticles with different diameters and 180 ~ 230 nm in diameter. Au doping effectively improves the gas sensing properties of ZnO nanofibers. The 1% Au-ZnO nanofibers have higher sensitivity and selectivity to formaldehyde at 310 ℃, the response time is 21-27 s, Recovery time is 11 ~ 15 s. The material has good application prospects in the field of formaldehyde detection.