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CoxNi100-x nanoparticles encapsulated by curved graphite layers: controlled in situ metal-catalytic preparation and broadband microwave absorption
Wang, H.; Dai, Y. Y.; Geng, D. Y.; Ma, S.; Li, D.; An, J.; He, J.; Liu, W.; Zhang, Z. D.; wanghan838@gmail.com; songma@imr.ac.cn
2015
Source PublicationNANOSCALE
ISSN2040-3364
Volume7Issue:41Pages:17312-17319
AbstractWe report a one-step approach for preparing dispersive CoxNi100-x nanoparticles completely encapsulated by curved graphite layers. The nanoparticles were prepared by evaporating Co-Ni alloys and the shell of graphite layers was formed by in situ metal-catalytic growth on the surface of nanoparticles whose layer number was controlled by tuning the Co content of the alloys. By modulating the composition of the magnetic core and the layer number of the shell, the magnetic and dielectric properties of these core/shell structures are simultaneously optimized and their permeability and permittivity were improved to obtain the enhanced electromagnetic match. As a result, the bandwidth of reflection loss (RL) exceeding -20 dB (99% absorption) of the nanocapsules is 9.6 GHz for S1, 12.8 GHz for S2, 13.5 GHz for S3 and 14.2 GHz for S4. The optimal RL value reaches -53 dB at 13.2 GHz for an absorber thickness of 2.55 mm. An optimized impedance match by controlling the growth of the core and shell is responsible for this extraordinary microwave absorption.
description.department[wang, h. ; dai, y. y. ; geng, d. y. ; ma, s. ; li, d. ; liu, w. ; zhang, z. d.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [an, j. ; he, j.] cent iron & steel res inst, div funct mat res, beijing 100081, peoples r china
Funding OrganizationNational Natural Science Foundation of China [51271178, 51171185]; National Basic Research Program of China, Ministry of Science and Technology China [2012CB933103]
Indexed Bysci
Language英语
WOS IDWOS:000363181600017
Citation statistics
Cited Times:63[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74699
Collection中国科学院金属研究所
Corresponding Authorwanghan838@gmail.com; songma@imr.ac.cn
Recommended Citation
GB/T 7714
Wang, H.,Dai, Y. Y.,Geng, D. Y.,et al. CoxNi100-x nanoparticles encapsulated by curved graphite layers: controlled in situ metal-catalytic preparation and broadband microwave absorption[J]. NANOSCALE,2015,7(41):17312-17319.
APA Wang, H..,Dai, Y. Y..,Geng, D. Y..,Ma, S..,Li, D..,...&songma@imr.ac.cn.(2015).CoxNi100-x nanoparticles encapsulated by curved graphite layers: controlled in situ metal-catalytic preparation and broadband microwave absorption.NANOSCALE,7(41),17312-17319.
MLA Wang, H.,et al."CoxNi100-x nanoparticles encapsulated by curved graphite layers: controlled in situ metal-catalytic preparation and broadband microwave absorption".NANOSCALE 7.41(2015):17312-17319.
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