石墨烯及其与ZnO复合结构的制备和性能研究

发布时间：2018-06-06 14:46

  本文选题：石墨烯 + 氧化锌纳米棒　； 参考：《东南大学》2015年硕士论文

【摘要】：石墨烯由于其高比表面积、优异的导电性和机械性能等特点成为近年研究的热点,由此产生的石墨烯基金属氧化物(二氧化钛、氧化锌、二氧化锰、氧化镍等)纳米复合结构由于其在催化降解、超级电容器和传感等方面具有巨大的潜在应用受到了广泛关注。本文采用化学气相沉积法在铜箔上制备石墨烯薄膜,在泡沫镍基体上制备三维石墨烯。采用水热法制备氧化锌纳米棒,得到了高度有序生长和结晶性好的氧化锌纳米棒,在此基础上,采用原位结晶法制备石墨烯／氧化锌纳米棒复合结构。通过SEM、TEM、 Raman等手段表征三维石墨烯。并研究不同生长时间的氧化锌纳米棒的紫外-可见光吸收特性、光致发光性及疏水性质,从而确定了水热法制备氧化锌纳米棒的最优参数,在选定的水热法制备氧化锌纳米棒的最优参数的基础上,研究不同的生长液的浓度对三维石墨烯/氧化锌纳米棒复合结构形貌及电化学性能的影响。主要结果如下：采用常压化学气相沉积法制备石墨烯,在生长时间为10 mins,冷却速率为20℃/mmins条件下系统探讨了影响石墨烯薄膜的主要参数甲烷氢气比,优化出了制备石墨烯薄膜的最佳工艺参数：甲烷氢气比=2 sccm:20 sccm。采用常压化学气相沉积法制备三维石墨烯,以泡沫镍为模板,在泡沫镍表面生长石墨烯,通过湿化学转移得到结构完整的三维石墨烯,且为连续的三维网络结构,孔径大小为400μm左右。采用水热法生长ZnO纳米棒,直径达50 nm,长度为530 nm左右。研究不同生长时间对氧化锌纳米棒的光致发光、紫外-可见光吸收特性及其亲疏水性。得到高度有序生长的氧化锌纳米棒,且结晶性良好。以三维石墨烯作为基体,采用原位结晶法在三维石墨烯表面水热法生长ZnO纳米棒,对得到的复合结构进行电化学测试。Zn2+浓度为0.025M配置的生长液制备的复合结构作为电极对H202的探测限为10μm,且线性探测范围为10 gM至160 μM,线性相关系数达0.99966,电流响应时间为3s,较相应单一的三维石墨烯性能有大幅度提高,有望应用于电化学传感器等领域。
[Abstract]:Because of its high specific surface area, excellent electrical conductivity and mechanical properties, graphene has become a hot spot in recent years, resulting in graphene based metal oxides (titanium dioxide, zinc oxide, manganese dioxide, etc.) Due to its potential applications in catalytic degradation, supercapacitors and sensing, nickel oxide nanocomposites have attracted wide attention. In this paper, graphene thin films were prepared on copper foil by chemical vapor deposition, and three dimensional graphene was prepared on nickel foam substrate. Zinc oxide nanorods were prepared by hydrothermal method, and ZnO nanorods with high order growth and good crystallinity were obtained. On this basis, graphene / zinc oxide nanorods were prepared by in situ crystallization method. Three dimensional graphene was characterized by means of SEM-TEM, Raman and so on. The UV-Vis absorption characteristics, photoluminescence and hydrophobic properties of ZnO nanorods at different growth times were studied, and the optimum parameters for the preparation of ZnO nanorods by hydrothermal method were determined. On the basis of the optimum parameters for the preparation of ZnO nanorods by hydrothermal method, the effects of different concentration of growth solution on the morphology and electrochemical properties of 3D graphene / zinc oxide nanorods were studied. The main results are as follows: under the condition of 10 mins growth time and 20 鈩，

本文编号：1987004