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论文类型：期刊论文
发表时间：2018-11-01
发表刊物：JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
收录刊物：SCIE、Scopus
卷号：29
期号：22
页面范围：19443-19453
ISSN号：0957-4522
关键字：Dielectric losses; Graphene; Hematite; Precipitation (chemical), Coprecipitation method; Impedance matchings; Microwave absorbing materials; Microwave absorption; Microwave absorption materials; Microwave absorption properties; Porous microstructure; Synergistic effect, Microwaves
摘要：Popcorn-like -Fe2O3/3D graphene sponge (-F/3DGS) composites have been successfully fabricated by a novel and facile two-step synthetic route combining template-assisted preparation and co-precipitation method for microwave absorption application. The results show that the popcorn-like -Fe2O3 nanoparticles with an average diameter about 150-200nm are uniformly encapsulated into the 3DGS exhibiting a porous microstructure with plenty of wrinkles. The composite displays the optimum microwave absorption properties with the minimum reflection loss (RLmin) of -55.7 dB and the maximum effective microwave absorption bandwidth up to 4.42GHz (12.30-16.72GHz) when the thicknesses are merely 1.4 and 1.7mm, respectively, exhibiting greatly enhanced microwave absorption properties compared to those of some 2D graphene-based microwave absorbing materials. The excellent microwave absorption properties are attributed to the synergistic effect between dielectric loss and magnetic loss mechanism and improvement for the impedance matching behavior. This study paves a way for designing and fabricating lightweight and high performance microwave absorption materials based on 3D graphene composites.