Co₃O₄/ZnO复合材料的三乙胺气敏性能研究

Triethylamine Gas Sensing Properties of Co₃O₄/ZnO Composites

通过水热法成功地制备了Co3O4/ZnO复合材料系列样品。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对系列样品进行了成分、形貌和结构表征。结果表明,Co3O4的复合成功地阻止了ZnO晶粒的生长,达到细化晶粒的作用。在气敏测试中,发现当工作温度为240℃时,复合材料的气敏性能明显优于纯ZnO。其中样品ZC-14对50 ppm三乙胺气体的灵敏度达到77.3,是纯ZnO样品的4倍,且具有较快的响应(6 s)和恢复(13 s)特性,最低检出限达到1 ppm。同时,我们还发现ZC-14具有良好的重复性和稳定性。

Co3O4/ZnO composites were successfully synthesized by hydrothermal method. The component, morphology and structure of the samples were determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the addition of Co3O4 successfully inhibited the growth of ZnO grains and refined them. In the gas sensitivity test, it was found that when the working temperature was 240˚C, the gas sensitivity property of the composites was obviously higher than that of pure ZnO. The sensitivity of ZC-14 to 50 ppm triethylamine reaches 77.3, which was 4 times that of pure ZnO, and it had fast response (6 s) and recovery (13 s), and the minimum detection limit was 1 ppm. We also observed that ZC-14 had good repeatability and stability.