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  • 石墨烯性能及其应用研究
  • 本站编辑:杭州孚安保温材料有限公司发布日期:2019-08-18 20:19 浏览次数:

本研究以石墨烯片层的三维宏观组装和性能研究为出发点,研究了石墨烯气凝胶的制备及电学应用。由于石墨烯气凝胶仅由片层结构堆叠,结构易坍塌,本研究用纳米纤维与石墨烯基气凝胶复合,探究其宏观机械性能、孔隙结构和电学性能的变化,探索了复合气凝胶在有机污染物吸附、隔热、压力传感等领域的应用。用乙二胺为还原剂还原Hummers法制备的氧化石墨烯,得到石墨烯水凝胶,经冷冻干燥后制备内部结构有序、导电性良好的石墨烯气凝胶。探究定向冷冻干燥技术对石墨烯气凝胶内部结构与导电性的影响,并将性能良好的石墨烯气凝胶搭建气凝胶压力传感器。结果表明,压力传感器循环性好,灵敏度高,0.5N时响应时间为0.5s左右。但其力学性能较差,结构易坍塌,限制其应用。采用纳米纤维改善石墨烯气凝胶力学性能。首先探索纳米纤维气凝胶的性能,采用交联剂聚乙烯醇(PVA)溶液物理交联纳米纤维,制得力学性能良好的纳米纤维气凝胶,探究交联剂含量对纳米纤维气凝胶微观形貌、宏观形态以及力学性

In this study, the preparation and electrical application of graphene aerogels were studied based on the three-dimensional macroscopic assembly and properties of graphene sheets. Due to the fact that graphene aerogels are only stacked by lamellar structure, the structure is prone to collapse. In this study, nanofibers were combined with graphene-based aerogels to explore the changes in their macroscopic mechanical properties, pore structure and electrical properties, and explore the application of composite aerogels in organic pollutant adsorption, heat insulation, pressure sensing and other fields. Go prepared by Hummers method was reduced with ethylenediamine as reducing agent to obtain graphene hydrogel. Graphene aerogel with well-ordered internal structure and good electrical conductivity was prepared after freeze-drying. To explore the influence of directional freeze-drying technology on the internal structure and electrical conductivity of graphene aerogels, and to build aerogel pressure sensors from graphene aerogels with good performance. The results show that the pressure sensor has good circularity and high sensitivity, and the response time at 0.5N is about 0.5s. However, its mechanical properties are poor and its structure is prone to collapse, which limits its application. Nanofibers were used to improve the mechanical properties of graphene aerogels. Firstly, the properties of nanofiber aerogels were explored. The crosslinking agent PVA solution was used to prepare nanofiber aerogels with good mechanical properties. The effects of crosslinking agent content on the micromorphology, macroscopic morphology and mechanical properties of nanofiber aerogels were explored