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DOI	10.1016/j.scib.2020.01.009
	Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties
	Li Y.; Chen X.; Wei Q.; Liu W.; Zhang Y.; Qin G.; Shi Z.; Zhang X.
发表日期	2020
ISSN	20959273
起始页码	623
结束页码	630
卷号	65 期号:8
英文摘要	Heteroatom substitution has been investigated to be a feasible way to optimize microwave absorption properties of core-shell structural nanocapsules at gigahertz. Although dielectric capacity has been increased at specific frequency with substituted absorbents, its broadband absorption performance is still relatively poor ascribed to the low dipole oscillation amplitude of single substituted heteroatom. In this study we demonstrate that sulfur and oxygen co-substituted heterostructure leads to high microwave absorption property of core-shell structural Fe@C nanocapsules at broadened frequency range, comparable to the single sulfur substitutional Fe@C nanocapsules. Experimental characterizations coupled with first-principles calculations reveal that the microwave absorption enhancement is triggered by the sulfur-oxygen co-substitution, which results in the serious symmetry breaking and thus leads to the charge separation at the co-substituted area. In particular, the nanocapsules exhibt the minimum reflection loss capcacity R(dB) of −52 dB at 6.8 GHz and the bandwith for R(dB) <−20 dB is in the frequency range of 3.1−12.7 GHz. The present study not only offers a deep insight into the relationship between heteroatom and microwave absorption property, but also puts forward a mentality for further designing microwave absorbents. © 2020 Science China Press
关键词	Core@shell Electric-dipole Microwave absorption Substitution Sulfur-oxygen doped
英文关键词	Calculations; Microwaves; Nanocapsules; Oxygen; Shells (structures); Substitution reactions; Sulfur; Core shell; Electric dipole; Experimental characterization; First-principles calculation; Heteroatom substitution; Microwave absorption; Microwave absorption properties; Oxygen-doped; Absorption
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207111
作者单位	School of Materials Science and Engineering, Key Laboratory for Anisotropy and Texture of Materials (MOE), Northeastern University, Shenyang, 110819, China; Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310012, China
推荐引用方式 GB/T 7714	Li Y.,Chen X.,Wei Q.,et al. Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties[J],2020,65(8).
APA	Li Y..,Chen X..,Wei Q..,Liu W..,Zhang Y..,...&Zhang X..(2020).Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties.Science Bulletin,65(8).
MLA	Li Y.,et al."Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties".Science Bulletin 65.8(2020).