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Preparation and evaluation of the microwave absorption properties of template-free graphene foam-supported Ni nanoparticles

机译：无模板石墨烯泡沫负载Ni纳米粒子的微波吸收性能的制备与评价

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A template-free graphene foam-supported Ni nanoparticle (GFN) composite was prepared by a hydrothermal method, followed by a calcination process. Phase, composition and morphology of the composites were characterized by XRD, Raman spectroscopy, FTIR, XPS, FESEM, and TEM. GFN exhibited a well-defined and interconnected three-dimensional (3D) network structure without template, and Ni nanoparticles were uniformly dispersed on the graphene nanosheets and attached via C–Ni covalent bonds. The microwave absorption (MA) properties of the samples were also investigated with a vector network analyzer. Based on the 3D structure of graphene foam, due to interfacial effects (graphene/Ni/wax) and the synergistic effect between graphene and Ni nanoparticles, GFN showed the most remarkable MA properties, compared with the graphene foam-supported NiO nanoparticles composite (GFNO), pure graphene foam (GF) and pure Ni nanoparticles. When the thickness of the GFN/wax sample was 3.4 mm and the content of GFN in the sample was only 1 wt%, the maximum reflection loss of GFN could reach ?49 dB at 11.5 GHz. This high reflection loss was a result of the multiple reflections and attenuations of electromagnetic waves within the 3D structure of the graphene foam, the interfacial polarization and the better impedance matching characteristics of GFN. Hence, a template-free graphene foam-supported Ni nanoparticle composite with strong absorption and lightweight properties showed a promising future in microwave absorption applications.
机译：通过水热法，然后进行煅烧工艺，制备了无模板的石墨烯泡沫负载的镍纳米粒子（GFN）复合材料。通过XRD，拉曼光谱，FTIR，XPS，FESEM和TEM对复合材料的相，组成和形貌进行了表征。 GFN展示了定义清晰且相互连接的三维（3D）网络结构，没有模板，并且Ni纳米颗粒均匀分散在石墨烯纳米片上，并通过C-Ni共价键连接。还用矢量网络分析仪研究了样品的微波吸收（MA）特性。基于石墨烯泡沫的3D结构，由于界面效应（石墨烯/镍/蜡）以及石墨烯和Ni纳米颗粒之间的协同效应，与石墨烯泡沫负载的NiO纳米颗粒复合材料（GFNO）相比，GFN表现出最显着的MA性能。 ），纯石墨烯泡沫（GF）和纯镍纳米粒子。当GFN /蜡样品的厚度为3.4 mm，并且样品中GFN的含量仅为1 wt％时，在11.5 GHz时，GFN的最大反射损耗可以达到约49 dB。这种高反射损耗是石墨烯泡沫的3D结构内电磁波的多次反射和衰减，界面极化和GFN更好的阻抗匹配特性的结果。因此，具有强吸收和轻质性能的无模板石墨烯泡沫负载的镍纳米粒子复合材料在微波吸收应用中显示出了有希望的未来。

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