基于银修饰增强氧化锌乙醇气敏性能研究

Enhancement of ethanol gas sensing properties of ZnO based on Ag modification

本文采用固相反应法制备银(Ag)修饰的氧化锌(ZnO)纳米颗粒(Ag-ZnO),将Zn(NO_(3))_(2)·6H_(2)O和AgNO_(3)按照比例研磨混合,在500℃下煅烧2 h,前驱体中Ag与Zn的摩尔比分别为0、1.0%、3.0%、5.0%、7.0%、10.0%。通过扫描电子显微镜(SEM)观察了修饰前后的Ag-ZnO微观结构,通过X射线衍射(XRD)证明了金属Ag的存在,通过比较其晶面间距,发现Ag颗粒修饰后的ZnO的晶格发生变化。Ag修饰后的ZnO纳米颗粒与本征ZnO相比对乙醇具有更好的气敏性能。与本征ZnO相比,Ag-ZnO传感器在最佳工作温度下的灵敏度更高,表现出较好的传感性能。5.0%修饰的Ag-ZnO传感器对乙醇的响应恢复速度最快,灵敏度最高。

In this paper,silver(Ag)nanoparticles modified zinc oxide(ZnO)nanoparticles(Ag-ZnO)were prepared by solid-state reaction.Zn(NO_(3))_(2)·6H_(2)O and AgNO_(3)were grinded and mixed in proportion and calcined at 500℃for 2 h.The molar ratios of Ag to Zn in the precursors were 0,1.0%,3.0%,5.0%,7.0%and 10.0%,respectively.The microstructures of Ag-ZnO before and after modification were observed by scanning electron microscope(SEM).The existence of Ag was proved by X-ray diffraction(XRD).The lattice of ZnO after modification of Ag particles changed.Ag modified ZnO nanoparticles have good gas sensitivity to ethanol.Ag-ZnO-based gas sensor has higher sensitivity at the optimal working temperature showing better sensing performance.The 5.0%modified Ag-ZnO sensor has the fastest response recovery and the highest sensitivity to ethanol vapor.