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Indexed by:期刊论文

Date of Publication:2018-12-14

Journal:JOURNAL OF MATERIALS RESEARCH

Included Journals:SCIE、Scopus

Volume:33

Issue:23

Page Number:4062-4070

ISSN No.:0884-2914

Key Words: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

Abstract: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.