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以硝酸锌和酒石酸为原料,采用液体燃烧法制备钇(Y)掺杂的氧化锌纳米片。利用XRD和SEM对其微观结构进行表征,并研究Y掺杂量对ZnO气敏性能的影响。结果表明:所制备的ZnO为纤锌矿结构且表面粗糙,呈纳米片状,直径为20~100nm。以Y掺杂量为2%(摩尔分数)的氧化锌制成的传感器在300℃时对体积分数为100×10~(-6)的乙醇的灵敏度高达17.50,其最佳工作温度(300℃)低于未掺杂ZnO(330℃)。当乙醇气体的体积分数低至5×10~(-6)时,ZnO传感器也有明显的灵敏度值(约为2.5),且在300℃工作时响应时间仅为2s。相比于其他气体,该种传感器对乙醇表现出极好的选择性。
Yttrium (Y) doped zinc oxide nanosheets were prepared by liquid combustion method using zinc nitrate and tartaric acid as raw materials. The microstructure was characterized by XRD and SEM, and the effect of Y doping on the gas sensing properties of ZnO was investigated. The results show that the prepared ZnO is wurtzite structure with a rough surface and a nanosheet shape with a diameter of 20-100 nm. The sensor made of zinc oxide with 2% Y doping amount has a sensitivity up to 17.50 at 300 ℃ for ethanol with a volume fraction of 100 × 10 -6. The best working temperature (300 ℃ ) Is lower than that of undoped ZnO (330 ℃). When the volume fraction of ethanol gas is as low as 5 × 10 -6, the sensitivity of ZnO sensor is also about 2.5, and the response time is only 2 s when working at 300 ℃. This sensor shows excellent selectivity for ethanol compared to other gases.