多元复合体系的纳米结构设计及其气敏性能研究

发布时间：2018-05-13 20:32

  本文选题：氧化锌 + 银纳米颗粒　； 参考：《南京理工大学》2016年硕士论文

【摘要】：气敏传感器在环境保护、食品安全、公共交通以及化工生产等领域都有着重要的应用。传统气敏材料存在工作温度高、灵敏度低、选择性差等缺点,通过贵金属表面修饰已成为研究的热点。与此同时,石墨烯或化学还原的氧化石墨烯(rGO)作为一种新颖的二维碳材料,有望应用到气敏元件中,进一步改善气敏元件的性能。本文首先采用简单的室温沉积法制备ZnO-Ag复合物。该方法实现了将Ag颗粒成功负载在ZnO的表面。当Ag颗粒的负载量为1 wt%时,敏感元件对1000ppm乙醇的灵敏度达到884.7,是纯ZnO的12.6倍,具有非常优异的气敏响应。不仅如此,元件对乙醇气体有很好的选择性及优良的稳定性,有望在未来应用于乙醇传感器中。进一步地,利用一步溶剂热法制备ZnO/rGO二元复合物,再通过室温沉积法制备ZnO-Ag/rGO三元复合物。通过透射电子显微镜、扫描电子显微镜、X-射线衍射、X-射线光电子能谱、拉曼光谱、红外光谱等手段对所得的产物进行表征,并研究其气敏性能。经过实验条件对比分析,溶剂和表面活性剂的种类、氧化石墨烯和银的加入对体系的形貌及气敏性能均有影响。石墨烯片层以及Ag的引入有助于:nO-Ag/rGO三元复合物形貌与性能的优化。与ZnO、SnO2等相比,在低工作温度范围,α-MoO3展现出优异的气敏性能。利用一步溶剂热法制备MoO3/rGO二元复合物,再在500℃下煅烧2h得到最终产物。结果表明该纳米带状产物是正交相α-MoO3,对乙醇表现出较好的响应特性。在工作温度为260℃时,可以检测到10 ppm乙醇气体。在100 ppm乙醇气体氛围中,与纯MoO3相比,其灵敏度提高了1个数量级。
[Abstract]:Gas sensors have important applications in environmental protection, food safety, public transportation and chemical production. Traditional gas sensing materials have the disadvantages of high working temperature, low sensitivity, poor selectivity and so on. At the same time, graphene or chemically reduced graphene oxide (RGO), as a novel two-dimensional carbon material, is expected to be applied to gas sensors and further improve the performance of gas sensors. In this paper, ZnO-Ag composites were prepared by a simple room temperature deposition method. In this method, Ag particles were successfully loaded on the surface of ZnO. When the loading amount of Ag particles is 1 wt%, the sensitivity of the sensitive element to 1000ppm ethanol is 884.7, which is 12.6 times as high as that of pure ZnO. Moreover, the element has good selectivity and good stability for ethanol gas, which is expected to be used in ethanol sensors in the future. Furthermore, ZnO/rGO binary composites were prepared by one step solvothermal method, and ZnO-Ag/rGO ternary complexes were prepared by room temperature deposition. The products were characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (Raman) and infrared spectroscopy (IR), and their gas sensing properties were studied. By comparing and analyzing the experimental conditions, it was found that the types of solvents and surfactants, the addition of graphene oxide and silver had an effect on the morphology and gas sensitivity of the system. The introduction of graphene and Ag can help to optimize the morphology and properties of the ternary composites. Compared with ZnO _ (2) O _ (2), 伪 -MoO _ (3) exhibits excellent gas sensitivity in the range of low operating temperature. MoO3/rGO binary composites were prepared by one step solvothermal method and calcined at 500 鈩，

本文编号：1884697