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论文类型：期刊论文

发表时间：2018-12-14

发表刊物：JOURNAL OF MATERIALS RESEARCH

收录刊物：SCIE、Scopus

卷号：33

期号：23

页面范围：4062-4070

ISSN号：0884-2914

关键字：Graphene; High resolution transmission electron microscopy; Microwaves; Nanocomposites; Oxides; Particle size; Transmission electron microscopy, Effective absorption; Electromagnetic properties; Graphene composites; Graphene nanocomposites; Microwave absorbing properties; Microwave absorption; Reflection loss; Vector network analysis, Manganese oxide

摘要：A low-temperature synthesis method for Mn3O4/graphene is described in this research. Adjusting the reaction time and temperature allows control over the phase and morphology of the synthesized manganese oxide, and therefore the microwave absorbing properties. X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and vector network analysis are used to characterize the phase, morphology, and electromagnetic properties. The results reveal that long reaction time can increase the particle size and high temperature can destroy the initial structure of graphene both of which have negative impact on the microwave absorbing properties. The Mn3O4-graphene composite synthesized in 140 degrees C for 4 h shows a maximum reflection loss (RL) reaching -20 dB at 14.4 GHz with absorber thickness of 2 mm, as well as an effective absorption bandwidth of more than 5 dB corresponding to RL below -10 dB.