Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties

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	Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties
	Li Yixing 1; Chen Xinyu 1; Wei Qian 1; Liu Weiwei 2; Zhang Yanhui 1; Qin Gaowu 1; Shi Zhen 2; Zhang Xuefeng 1
刊名	SCIENCE BULLETIN
	2020
卷号	65 期号:8 页码:623-630
关键词	COMPLEX PERMITTIVITY TOPOLOGICAL DEFECTS RAMAN-SPECTROSCOPY GRAPHENE IRON PERMEABILITY TRANSITION FRAMEWORKS THICKNESS DISCHARGE Microwave absorption Electric-dipole Substitution Core@shell Sulfur-oxygen doped
ISSN号	2095-9273
其他题名	Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties
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. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
资助项目	[National Natural Science Foundation of China] ; [Fundamental Research Funds for the Central Universities] ; [Zhejiang Provincial Natural Science Foundation] ; [National 1000-Plan for Young Scholars] ; [Northeastern University of China]
语种	英语
CSCD记录号	CSCD:6763614
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/148676]
专题	金属研究所_中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.Hangzhou Dianzi Univ, Coll Materials & Environm Engn, Inst Adv Magnet Materials, Hangzhou 310012, Peoples R China
推荐引用方式 GB/T 7714	Li Yixing,Chen Xinyu,Wei Qian,et al. Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties[J]. SCIENCE BULLETIN,2020,65(8):623-630.
APA	Li Yixing.,Chen Xinyu.,Wei Qian.,Liu Weiwei.,Zhang Yanhui.,...&Zhang Xuefeng.(2020).Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties.SCIENCE BULLETIN,65(8),623-630.
MLA	Li Yixing,et al."Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties".SCIENCE BULLETIN 65.8(2020):623-630.