Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 648, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.129411
Keywords
Reduced graphene oxide; Copper-nickel ferrite; Nitrogen doping; Tetragonal morphology; Electromagnetic absorption
Categories
Funding
- Foundation of Provincial Natural Science Research Project of Anhui Colleges [KJ2021ZD0047]
- Anhui Provincial Natural Science Foundation [2008085J27]
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In this work, a nitrogen-doped reduced graphene oxide/copper-nickel ferrite composite was successfully fabricated via a hydrothermal process. The results showed that the type and composition of the spinel ferrites greatly influenced the morphology and electromagnetic absorbing performance of the composites. The NRGO/Cu0.5Ni0.5Fe2O4 composite exhibited good particle dispersion and significantly enhanced EM absorbing performance.
The development of graphene-based magnetic composites with strong absorption, wide bandwidth and thin thickness remains a great challenge. In this work, nitrogen-doped reduced graphene oxide/copper-nickel ferrite (NRGO/Cu0.5Ni0.5Fe2O4) composite was fabricated via a one-step hydrothermal process. Results demonstrated that the microscopic morphology and electromagnetic (EM) absorbing performance of as-synthesized magnetic composites were greatly influenced by the type and composition of spinel ferrites. Significantly, the attained NRGO/Cu0.5Ni0.5Fe2O4 composite showed a good dispersion of particles, and a large number of tetragonal Cu0.5Ni0.5Fe2O4 nanoparticles were almost homogeneously loaded on the rippled and wrinkled surfaces of lamellar NRGO. Compared with NRGO/CuFe2O4 and NRGO/NiFe2O4 composites, the NRGO/Cu0.5Ni0.5Fe2O4 composite presented the notably enhanced EM absorbing performance. It was noteworthy that the optimal minimum reflection loss reached up to - 67.4 dB and maximum effective absorption bandwidth achieved 4.7 GHz under a very thin matching thickness of 1.7 mm and a filler loading content of 50 wt%. Furthermore, the possible EM dissipation mechanism had been proposed. The results of this work would provide a reference for the development of RGO-based composites as thin and high-performance EM wave absorbers.
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