Back to Search
Start Over
One-pot synthesis of CoFe2O4/graphene oxide hybrids and their conversion into FeCo/graphene hybrids for lightweight and highly efficient microwave absorber
- Source :
- Journal of Materials Chemistry A. 3:5535-5546
- Publication Year :
- 2015
- Publisher :
- Royal Society of Chemistry (RSC), 2015.
-
Abstract
- CoFe2O4/graphene oxide hybrids have been successfully fabricated via a facile one-pot polyol route, followed by chemical conversion into FeCo/graphene hybrids under H2/NH3 atmosphere. These magnetic nanocrystals were uniformly decorated on the entire graphene nanosheets without aggregation. The morphology, chemical composition and crystal structure have been characterized in detail. In particular, FeCo/graphene hybrids show significant improvement in both permeability and permittivity due to the combination of the high magnetocrystalline anisotropy of metallic FeCo and high conductivity of light-weight graphene. This leads to remarkable enhancement in microwave absorption properties. The maximum reflection loss of FeCo/graphene hybrids reaches −40.2 dB at 8.9 GHz with a matching thickness of only 2.5 mm, and the absorption bandwidth with reflection loss exceeding −10 dB is in the 3.4–18 GHz range for the absorber thickness of only 1.5–5 mm. Moreover, the experimental relationship between matching thickness and frequency is found to obey the quarter-wavelength matching model, facilitating the design of FeCo/graphene hybrid film for practical application. The results suggest that the FeCo/graphene hybrids developed here can serve as an ideal candidate for the manufacture of light-weight and high-efficiency microwave-absorbing devices.
- Subjects :
- Permittivity
Materials science
Renewable Energy, Sustainability and the Environment
Graphene
business.industry
Reflection loss
Oxide
Nanotechnology
General Chemistry
Magnetocrystalline anisotropy
law.invention
chemistry.chemical_compound
Nanocrystal
chemistry
law
Optoelectronics
General Materials Science
business
Graphene nanoribbons
Graphene oxide paper
Subjects
Details
- ISSN :
- 20507496 and 20507488
- Volume :
- 3
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry A
- Accession number :
- edsair.doi...........f1190a13d5fa0fbc263dd240d8375c3f