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- Title
Fabrication of ternary CoNi@SiO@RGO composites with enhanced electromagnetic (EM) wave absorption performances.
- Authors
Zhou, Suhua; Huang, Ying; Yan, Jing; Han, Xiaopeng; Chen, Xuefang
- Abstract
The ternary hybrids composed of a CoNi inner unit along with SiO and graphene outer units (CoNi@SiO@RGO) are synthesized via a facile solvothermal/sol-gel/hydrothermal strategy. The structures, chemical composition and morphologies of CoNi, CoNi@SiO and CoNi@SiO@RGO are analyzed in detail. Besides, the electromagnetic (EM) wave absorption performances of the as-prepared products are invested on the basis of transmission lines theory. The results indicate that the ternary CoNi@SiO@RGO composites display enhanced microwave-absorbing characteristics in terms of both the maximum reflection loss and the absorption bandwidth, compared with the pristine CoNi alloy and CoNi@SiO microparticles. The maximum R of CoNi@SiO@RGO reaches as high as −50.3 dB at 6.8 GHz, and the absorption bandwidth below −10 dB is up to 4.0 GHz with a thickness of 4 mm. A possible mechanism of microwave absorption is explained, drawing a conclusion that the improvement of absorption property is mainly ascribed to the synergic effect of combining magnetic and dielectric components, and the interface interactions of multi-component hierarchical structure.
- Subjects
ELECTROMAGNETIC wave absorption; SILICA; SOL-gel processes; COBALT; NICKEL
- Publication
Journal of Materials Science: Materials in Electronics, 2017, Vol 28, Issue 24, p18558
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-017-7804-7