Hits:

Indexed by:期刊论文

Date of Publication:2017-09-30

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI、Scopus

Volume:719

Page Number:296-307

ISSN No.:0925-8388

Key Words:Fe3O4; alpha-Fe2O3; Reduced graphene oxide; Impedance match; Electromagnetic wave absorption

Abstract:Matrimony vine-like a-Fe2O3/reduced graphene oxide have been prepared by a facile method, followed by transformation into Fe3O4/reduced graphene oxide through annealing at 500 degrees C with the particle size and morphology significantly unchanged. By changing the mass ratio of iron oxide, the hybrids display optimal electromagnetic wave absorption performance. The maximum reflection loss value of a-Fe2O3/reduced graphene oxide is -46.6 dB at 5.6 GHz with a thickness of 4.0 mm and the highest effective absorption bandwidth reaches 4.9 GHz at the thickness of 1.8 mm. Interestingly, after annealing treatment, the hybrids in which alpha-Fe2O3 were converted into Fe3O4 exhibit an effective absorption bandwidth of 4.6 GHz and the maximum reflection loss value reaches - 42.8 dB at 13.3 GHz with the thickness of only 1.8 mm, indicating Fe3O4/reduced graphene oxide can be used as an efficient electromagnetic wave absorbing material in high temperature and moisture environment, where Fe3O4 will be oxidized into aFe(2)O(3). Results show the enhancement of electromagnetic wave absorption performance originates from synergistic effects of dielectric loss and magnetic loss. Our study provides a potential method for preparing environmental resistance electromagnetic wave absorbing materials. (C) 2017 Elsevier B.V. All rights reserved.