Gas sensing properties of Y-doped ZnO nanosheets synthesized via combustion method

燃烧法制备的Y掺杂ZnO纳米片的气敏性能（英文）

ZnO nanosheets doped with yttrium（Y） were synthesized via a solution combustion method using zinc nitrate and tartaric acid as raw materials.The scanning electron microscopy and X-ray powder diffraction were used to characterize ZnO nanosheets and the gas sensing properties of them were investigated.The results show that the as-synthesized ZnO nanosheets with diameters of20-100 nm have a wurtzite structure with rough surface.The sensor made from the 2%Y-doped ZnO nanosheets exhibits a stronger response toward 100x10-6（volume fraction） ethanol,its sensitivity at 300℃ is 17.50,and its optimal operating temperature（300℃）is lower than that of the pure ZnO（330℃）.The obvious sensitivity（about 2.5） can be observed at the volume fraction of ethanol as low as 5×10-（-6）,while its the response time is only 2s at 300℃.Moreover,the Y-doped ZnO sensor has a better selectivity to ethanol than other gases.

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。