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Date of Publication:2022-10-04

Journal:材料研究学报

Volume:32

Issue:2

Page Number:119-126

ISSN No.:1005-3093

Abstract:Fe_3O_4 nanoparticles coated hollow microspheres of reduced graphene
   oxide (Air@rGO Fe_3O_4) were synthesized via a simple and efficient
   two-step method consisting of water-in-oil (W/O) emulsion technique and
   subsequent annealing process.The Air@rGO Fe_3O_4 hollow microspheres
   showed good electromagnetic properties because of the coexistence of
   magnetic loss and dielectric loss to microwave.The microwave absorbing
   bandwidth (reflection loss<-10 dB) for Air@rGOFe_3O_4 of thickness in
   2.8 mm (with 33.3 mass% paraffin) locates in the range of 7.5~14.7 GHz,
   while a minimum reflection loss -52 dB at 10.0 GHz.More interestingly,
   the microwave absorbing properties of the hollow microspheres can be
   easily controlled by tuning the ratio of the two components in the
   composites and the thickness of samples, and as the Fe_3O_4 content
   increase, the minimum reflection loss valve of Air@rGO Fe_3O_4
   microspheres move to higher frequency range.These Air@rGOFe_3O_4 hollow
   microspheres are great potential candidate as microwave absorbents due
   to their excellent properties such as wide absorbing frequency, strong
   absorption, low density and controllable absorbing properties.

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