基于ZnO的超快恢复三乙胺气敏传感器

Triethylamine Gas Sensor Based on ZnO with Ultra-Fast Recovery Time

不同形貌ZnO纳米材料的合成对高性能气敏传感器的开发具有重要意义。采用微波辅助法合成了ZnO纳米微球和纳米棒,通过X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)和紫外-可见分光光度计(UV-Vis)分别对材料的结构、形貌和光学性能进行表征,研究了两种形貌ZnO纳米材料的气敏性能。结果表明:ZnO纳米微球与ZnO纳米棒相比表现出良好的气敏性能,在370℃下对体积分数为100×10^(-6)的三乙胺灵敏度高达110.4,响应和恢复时间分别为18 s和2 s,检测限低至0.1×10^(-6),在长期的循环测试中ZnO纳米微球传感器可以保持较高的响应值、良好的稳定性和重复性。

The synthesis of ZnO nanomaterials with different morphologies is of great importance for the development of high-performance gas sensors.ZnO nano-microspheres and nanorods were synthesized by the microwave-assisted method and characterized via X-ray diffractometer(XRD),field emission scanning electron microscopy(FESEM)and UV-Vis spectrophotometer(UV-Vis)for their structures,morphologies and optical properties,respectively.The gas sensing performances of ZnO nanomaterials with two morphologies were investigated.The results show that compared with ZnO nanorods,ZnO nano-microspheres exhibit better gas sensing performance with high response of 110.4 to triethylamine with a volume fraction of 100×10^(-6)at 370℃.Response and recovery time are 18 s and 2 s,respectively,and the detection limit is as low as 0.1×10^(-6).The ZnO nano-microspheres sensor can maintain a high response value,good stability and reproducibility in a long-term cycling test.