单层Ag-SnO_(2)空心纳米球的制备及气敏特性研究

Preparation and Gas-sensitive Propertiesof Single Layer Ag-SnO_(2) Hollow Nanospheres

采用水热法结合高温煅烧,以碳球为模板制备了纯SnO_(2)和不同含量的Ag-SnO_(2)单层空心纳米球。通过对壳层材料进行贵金属Ag掺杂,利用Ag的化学催化活性以及Ag与SnO_(2)之间的功函数差值提高了材料的气敏性能。对样品的形貌进行了表征,结果表明:制备的材料为单层纳米颗粒结合形成的具有大量介孔的球壳结构。通过对制备的几种材料进行气敏性能测试,结果表明:Ag掺杂不仅有效降低了材料的最佳工作温度,而且大幅度提高了材料的响应值,在100μL/mL乙醇浓度下,Ag-SnO_(2)的响应值是纯SnO_(2)响应值的10倍多。另外,探讨了Ag-SnO_(2)空心纳米球的气敏机理。

Pure SnO_(2) and different contents of Ag-SnO_(2) monolayer hollow nanospheres were prepared by hydrothermal method combined with high temperature calcination using carbon spheres as a template.The gas-sensitive performances of the materials were improved by doping the shell layer material with precious metal Ag,using the chemical catalytic activity of Ag and the difference of the work function between Ag and SnO_(2).The results of the morphological characterization of the samples show that the prepared material is a spherical shell structure with a large number of mesopores formed by the combination of monolayer nanoparticles.By testing the gas-sensitive performances of the prepared materials,the results show that Ag doping not only effectively reduces the optimum working temperature,but also highly improves the response value of the material.At the concentration of 100μL/mL ethanol,the response value of Ag-SnO_(2) was more than 10 times of pure SnO_(2).In addition,the gas-sensitive mechanism of Ag-SnO_(2) hollow nanospheres was also discussed.