还原氧化石墨烯/二氧化锰纳米复合结构的构筑及其电磁损耗机理

As a dielectric loss media, manganese dioxide has relatively narrower absorption bandwidth, due to its weak magnetic loss and poor electrical conductivity. Graphene, or reduced graphene oxide, as a kind of carbon materials constructed by π-π bonding, has gained great application in the fields of electronics, waveguide, electromagnetic shielding and absorption materials, due to its higher specific surface areas, better electrical conductivity and electron mobility. Combining manganese dioxide with graphene is expected to improve its loss properties and microwave absorption performances. However, there are no public reports on the electromagnetic properties of graphene/manganese dioxide materials. And the electromagnetic loss mechanism of graphene/manganese dioxide composites still needs intensive study. .This project is aimed at the research of the electromagnetic loss mechanism and its temperature dependence of graphene/manganese dioxide (rGO/MnO2) composites. Through the controllable synthesis of rGO/MnO2 nanostructures, it is expected to clarify the growth mechanism of the morphologies and microstructures, and the optimum preparation techniques. Through the analysis of their interface and surface characteristics, relaxation phenomena, polarization modes and electromagnetic properties of the rGO/MnO2 composites, it is expected to illustrate the electromagnetic loss and absorption mechanisms, as well as their temperature dependence of the composites. .Research results can provide experimental ideas and theoretical directions of the electromagnetic characteristic studies for other inorganic electromagnetic absorbing materials.

二氧化锰作为一种介电损耗介质，由于其磁性差，电导率低，导致其有效吸收频段较窄，限制了其在电磁波吸收材料领域的应用。石墨烯由于其高的比表面积、良好的导电性能和高的室温电子迁移率，已经在电子、波导、电磁屏蔽和吸波材料领域得到应用。将二氧化锰与石墨烯复合，有望提高二氧化锰的损耗性能，从而改善其吸波性能。但目前尚未见有关于石墨烯/二氧化锰纳米复合结构电磁损耗性能的报道，对其电磁损耗机理尚需进行深入研究和探讨。.本项目拟开展石墨烯复合二氧化锰（rGO/MnO2）纳米结构的构筑及其电磁损耗机理和温度效应的研究工作。通过rGO/MnO2复合结构的可控制备及其晶型演化过程，明确rGO/MnO2复合结构的生长机理；通过rGO/MnO的界面和表面特征、弛豫和极化方式及电磁性能分析，阐明rGO/MnO2复合结构的电磁波损耗机理及其温度效应。研究结果可以为其它无机非金属材料的电磁性能研究提供实验思路和理论指导。

二氧化锰作为一种介电损耗介质，由于其磁性差，电导率低，导致其有效吸收频段较窄，限制了其在电磁波吸收材料领域的应用。本项目开展了石墨烯复合二氧化锰（rGO/MnO2）纳米结构的构筑及其电磁损耗机理和温度效应的研究工作。通过水热法和水浴法制备获得了rGO/MnO2复合结构，分析了rGO/MnO2复合结构的生长机理，并通过rGO/MnO2的界面和表面特征、弛豫和极化方式及电磁性能分析，阐明了rGO/MnO2复合结构的电磁波损耗机理。同时以生物碳为碳源，获得了生物碳复合二氧化锰和氧化镍复合材料，并对其吸波性能及机理进行了研究。通过项目研究，获得了rGO/MnO2、rGO/MnCO3、CNTs@MnOOH、碳球(CS)@MnO2、NiO/BPC与 MnO2/BPC等多种复合材料，均表现出较好的电磁性能。项目所取得的研究成果可以为新型电磁波吸收材料的研究提供一定的指导。