Microwave Absorption Properties of Fe₃O₄-Graphene Nanohybrids

Abstract:

Magnetite (Fe₃O₄)-graphene nanohybrids having three different weight ratios of magnetite to graphene were synthesized by a facile in-situ deposition method. The combination of dielectric properties of graphene and magnetic properties of magnetite makes the nanohybrids an ideal choice of material for microwave absorption applications. In regards to that, the electromagnetic properties and microwave absorbing characteristics were investigated in a frequency range of 1-18 GHz. The reflection loss (RL) reaches a minimum of-40.44 dB at 6.84 GHz with a thickness of 7 mm for the sample containing 73 wt·% of Fe₃O₄. The bandwidth corresponding to the RL below-10 dB is 7.05 GHz. The as-prepared Fe₃O₄-graphene nanohybrids showed good microwave absorption ability in the low frequency band (C-band) which can be ascribed to improved impedance matching characteristics, enhanced interfacial polarizations as well as the magnetic loss contributions. Moreover, the frequency related to minimum RL could be tuned by varying the weight ratios of magnetite to graphene.

• Periodical: Solid State Phenomena (Volume 268)
• Pages: 297-301
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.268.297
• Online since: October 2017
• Authors: Yau Thim Ng, Wei Kong, Sivanesan Appadu, Ing Kong*
• Keywords: Graphene, Hybrid, Magnetite, Microwave Absorption Properties

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