Ag掺杂比例对ZnO纳米材料气敏性能的影响

Effect of different ratios of Ag dopant on gas sensitivity of ZnO nanowires

采用物理热蒸发法制备ZnO纳米材料及不同质量分数(1%,3%,5%,wt,下同)Ag掺杂的ZnO纳米材料,制备成旁热式气敏元件,采用静态配气法对目标气体进行气敏性能测试。实验结果表明,Ag掺杂ZnO纳米材料较纯ZnO纳米材料对目标气体(酒精、甲烷、一氧化碳)的气敏性能有所提高。其中,Ag掺杂质量分数为1%的ZnO纳米材料气敏性能最佳,提高幅度分别达215%,128%和76%(C2H5OH,CH4,CO)。借助X射线衍射仪和扫描电子显微镜对所制得不同比例Ag掺杂的ZnO纳米结构进行表征,并对实验结果进行气敏性能分析,结合势垒模型和能带理论进行气敏机理分析。

Pure and different ratios（lwt%, 3wt%, 5wt % ）of Ag-doped ZnO-nanomaterials have been grown by ther-mal evaporation technique. Using these samples, different ZnOnanomaterial gas sensors have been fabricated. The experi- ment result showed that the performances of the sensors can be enhanced by Ag doping in the gas environment（C4 H5 OH, CH4 ,CO）. And the ZnO nano-material with doping ratio of lwt% won the highest performance. The nano--material sam- ples were characterized systematically by SEM, XRD. And gas-sensing property were analyzed with experiment result. At last, the sensing mechanism were discussed combining with the potential barrier model and band theory.