CoxNi100-x nanoparticles encapsulated by curved graphite layers: controlled in situ metal-catalytic preparation and broadband microwave absorption

IMR OpenIR

	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
发表期刊	NANOSCALE
ISSN	2040-3364
卷号	7 期号:41 页码:17312-17319
摘要	We 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.
部门归属	[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
资助者	National Natural Science Foundation of China [51271178, 51171185]; National Basic Research Program of China, Ministry of Science and Technology China [2012CB933103]
收录类别	sci
语种	英语
WOS记录号	WOS:000363181600017
引用统计	被引频次：104[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/74699
专题	中国科学院金属研究所
通讯作者	wanghan838@gmail.com; songma@imr.ac.cn
推荐引用方式 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.