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Interface transformation for enhanced microwave-absorption properties of core double-shell nanocomposites
Feng, Yang; Li, Da; Jiang, Linwen; Dai, Zhiming; Wang, Yu; An, Jing; Ren, Weijun; He, Jun; Wang, Zhenhua; Liu, Wei; Zhang, Zhidong; Li, D (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
2017-02-15
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume694Pages:1224-1231
AbstractMicrowave absorption properties of core double-shell nanocomposites with FeCo core, carbon inner shell and CoFe2O4 or mixed FeCo-CoFe2O4 outer shell have been investigated in the 2-18 GHz frequency range. The synergetic effect of the composition and interface evolution of the core double-shell nano composites favors the electromagnetic properties. Multiple dielectric/magnetic loss peaks are observed in the frequency dependence of the complex permittivity/complex permeability of the core double-shell nanocomposites. Compared with FeCo/C nanocapsules and CoFe2O4 nanoparticles, new dielectric relaxation peaks at 10.5 and 14.4 GHz and loss peaks at 4 and 16.4 GHz are found, which are ascribed to the interface effect in the (x)FeCo/C/CoFe2O4 nanocomposites, where x is the weight fraction of FeCo/C nanocapsules in the (x)FeCo/C/CoFe2O4 nanocomposites. The absorption bandwidth with reflection-loss (RL) values exceeding-10 dB extends up to 7.2 GHz, covering the 10.8-18 GHz frequency range in the case of the (80 wt%)FeCo/C/CoFe2O4 nanocomposite with a minimum RL value of-25.8 dB at 16.7 GHz. Thanks to the modified composition/crystal size of the outer shell, enhanced microwave-absorption properties are obtained in the (60 wt%)FeCo/C/(FeCo, CoFe2O4) nanocomposite, where the minimum RL value is-38.1 dB at 13.4 GHz and which has a broad absorption bandwidth of 6.7 GHz (RL values exceeding-10 dB), covering the 11.3-18 GHz frequency range by choosing an appropriate absorber thickness. (C) 2016 Elsevier B.V. All rights reserved.; Microwave absorption properties of core double-shell nanocomposites with FeCo core, carbon inner shell and CoFe2O4 or mixed FeCo-CoFe2O4 outer shell have been investigated in the 2-18 GHz frequency range. The synergetic effect of the composition and interface evolution of the core double-shell nano composites favors the electromagnetic properties. Multiple dielectric/magnetic loss peaks are observed in the frequency dependence of the complex permittivity/complex permeability of the core double-shell nanocomposites. Compared with FeCo/C nanocapsules and CoFe2O4 nanoparticles, new dielectric relaxation peaks at 10.5 and 14.4 GHz and loss peaks at 4 and 16.4 GHz are found, which are ascribed to the interface effect in the (x)FeCo/C/CoFe2O4 nanocomposites, where x is the weight fraction of FeCo/C nanocapsules in the (x)FeCo/C/CoFe2O4 nanocomposites. The absorption bandwidth with reflection-loss (RL) values exceeding-10 dB extends up to 7.2 GHz, covering the 10.8-18 GHz frequency range in the case of the (80 wt%)FeCo/C/CoFe2O4 nanocomposite with a minimum RL value of-25.8 dB at 16.7 GHz. Thanks to the modified composition/crystal size of the outer shell, enhanced microwave-absorption properties are obtained in the (60 wt%)FeCo/C/(FeCo, CoFe2O4) nanocomposite, where the minimum RL value is-38.1 dB at 13.4 GHz and which has a broad absorption bandwidth of 6.7 GHz (RL values exceeding-10 dB), covering the 11.3-18 GHz frequency range by choosing an appropriate absorber thickness. (C) 2016 Elsevier B.V. All rights reserved.
description.department[feng, yang ; li, da ; jiang, linwen ; dai, zhiming ; ren, weijun ; wang, zhenhua ; liu, wei ; zhang, zhidong] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [wang, yu ; an, jing ; he, jun] cent iron & steel res inst, div funct mat, beijing 100081, peoples r china
KeywordComplex Permeability Complex Permittivity Interface Effect Nanocomposite
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51171185, 51331006, 51371055]; National Basic Research Program of China [2012CB933103]; Ministry of Science and Technology China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78295
Collection中国科学院金属研究所
Corresponding AuthorLi, D (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Feng, Yang,Li, Da,Jiang, Linwen,et al. Interface transformation for enhanced microwave-absorption properties of core double-shell nanocomposites[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2017,694:1224-1231.
APA Feng, Yang.,Li, Da.,Jiang, Linwen.,Dai, Zhiming.,Wang, Yu.,...&Li, D .(2017).Interface transformation for enhanced microwave-absorption properties of core double-shell nanocomposites.JOURNAL OF ALLOYS AND COMPOUNDS,694,1224-1231.
MLA Feng, Yang,et al."Interface transformation for enhanced microwave-absorption properties of core double-shell nanocomposites".JOURNAL OF ALLOYS AND COMPOUNDS 694(2017):1224-1231.
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