摘要作为二文纳米材料之一的石墨烯，独特的电子结构、极大的比表面积和极小的带隙,使它在相催化、电化学及气体传感器领域里都存在着广泛的应用前景。本毕业设计以Co(NO3)2•6H2O、Zn(NO3)2•6H2O和氧化石墨烯为原料，以异丙醇为溶剂和还原剂，以PVP为表面活性剂。利用氧化石墨烯独特的结构特征，采取一步溶剂热合成法制备了一系列Co3O4-ZnO/石墨烯纳米复合材料，并且通过X-射线衍射、拉曼光谱、透射电子显微镜等手段对所得的复合材料进行了结构表征。结果表明，采取一步溶剂热合成法可以成功制备出石墨烯表面负载立方形Co3O4和颗粒形ZnO的纳米复合材料,平均直径为20 nm。以此为基础，改变石墨烯的负载量，并将制备得到的复合材料制成厚膜型气敏元件，进一步研究其气敏性能。结果发现石墨烯负载量在2 %时气敏性达到最高值，在240 ℃对100 ppm的乙醇的灵敏度为12.7，并且对不同种类气体有良好的选择性，因此，该气敏元件有望应用于高效乙醇传感器。21853
关键词 溶剂热合成法 四氧化三钴 氧化锌 氧化石墨烯 气敏性能
毕业论文设计说明书（论文）外文摘要
Title Depositing Co3O4-ZnO nanoparticles onto surfaces of graphene sheet and their properties
Abstract
Graphene as one of two-dimensional materials has unique electronic structure, great surface area and small band gap, which makes it has a wide range of applications field in phase catalytic, electrochemistry and gas sensors. In this dissertation, the Co3O4-ZnO/graphene composite was successfully prepared by a solvothermal method using graphene oxide, Co(NO3)2•6H2O and Zn(NO3)2•6H2O as raw materials, isopropanol as solvent and reducing agent, and PVP as surfactant . Meanwhile, the microstructure of obtained composites was investigated by XRD, Raman spectrum, TEM and other methods. The results show that, via this solvothermal process, the nano-cubic Co3O4 and nano-particle ZnO nanoparticles with average diameters of 20 nm can be uniformly loaded the surfaces of graphene sheets .On the basis of this, the samples are made into gas-sensitive elements for thick film gas sensor by controlling the various loading amount of grapheme. The gas sensitivity result shows that the gas sensitivity reaches the maximum when the loading content of graphene is 2 %, and its sensitivity for 100 ppm of ethanol at 240 ℃ can reach 12.7. More significantly, the obtained composite present good selectivity for different gases . Therefore, the gas sensor is expected to have wide application for alcohol sensor.
Keywords solvothermal method Co3O4 ZnO graphite oxide
gas sensitivity
目 次
1 绪论 1
1.1 石墨烯 1
1.2 氧化石墨烯 3
1.3 气敏传感器 4
1.4 四氧化三钴（Co3O4） 5
1.5 氧化锌（ZnO） 6
1.6 关于本实验采用的合成方法 6
1.7 毕设课题的研究意义与创新点 7
2 Co3O4-ZnO/石墨烯三元复合材料的制备 8
2.1 药品与仪器 8
2.2 Co3O4-ZnO/石墨烯三元复合材料的制备 9
3 Co3O4-ZnO/石墨烯纳米复合材料的表征 11
3.1 XRD测试 11
3.2 Raman 测试 11
3.3 TEM测试 11
3.4 气敏性能测试 11
4 结果与讨论 13
4.1 材料的物相分析 13
4.2 材料的形貌分析 15
4.3 气敏性能测试 17 石墨烯负载Co3O4-ZnO纳米颗粒的制备及性能研究:http://www.751com.cn/huaxue/lunwen_14253.html