Surface-Oxidized Amorphous Fe Nanoparticles Supported\non Reduced Graphene Oxide Sheets for Microwave Absorption

Abstract

A simple one-pot chemical reduction\nsynthesis is provided to prepare a novel metal–graphene nanostructure,\nin which surface-oxidized amorphous Fe nanoparticles grow uniformly\non reduced graphene oxide (rGO) sheets to form amorphous-Fe/rGO nanocomposites.\nA relatively low coercivity of 60.2 Oe is achieved in these magnetic\ngraphene-based nanosheets supported with uniformly distributed amorphous\nFe nanoparticles. The dielectric properties of amorphous-Fe/rGO nanocomposites\nare effectively tuned by suitable rGO additions. Improved impedance\nmatching resulting from balanced magnetic and dielectric loss can\nbe obtained in the Fe/5 wt % rGO nanocomposites, which results in\ntheir good wave absorption performance containing a high maximum reflection\nloss (−72.8 dB at 4.48 GHz) for a 3.26 mm thickness and a wide\nabsorption bandwidth (5.90 GHz, <−10 dB). The simple synthesis,\nhigh structural stability, low density, and excellent wave absorption\nproperties for amorphous-Fe/rGO nanocomposites enable their significant\nlatent applications in lightweight electromagnetic microwave absorbers.