Article Cite This: ACS Appl. Nano Mater. 2019, 2, 4367−4376
www.acsanm.org
Surface-Oxidized Amorphous Fe Nanoparticles Supported on Reduced Graphene Oxide Sheets for Microwave Absorption Yue Wu,†,‡ Weizhen Pan,† Ya Li,† Bai Yang,*,† Bingyang Meng,† Ran Li,*,† and Ronghai Yu† †
Key Laboratory of Aerospace Advanced Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China ‡ School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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S Supporting Information *
ABSTRACT: A simple one-pot chemical reduction synthesis is provided to prepare a novel metal−graphene nanostructure, in which surface-oxidized amorphous Fe nanoparticles grow uniformly on reduced graphene oxide (rGO) sheets to form amorphous-Fe/rGO nanocomposites. A relatively low coercivity of 60.2 Oe is achieved in these magnetic graphene-based nanosheets supported with uniformly distributed amorphous Fe nanoparticles. The dielectric properties of amorphous-Fe/rGO nanocomposites are effectively tuned by suitable rGO additions. Improved impedance matching resulting from balanced magnetic and dielectric loss can be obtained in the Fe/5 wt % rGO nanocomposites, which results in their good wave absorption performance containing a high maximum reflection loss (−72.8 dB at 4.48 GHz) for a 3.26 mm thickness and a wide absorption bandwidth (5.90 GHz,
