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

被引:128
作者
Li, Yixing [1 ]
Chen, Xinyu [1 ]
Wei, Qian [1 ]
Liu, Weiwei [2 ]
Zhang, Yanhui [1 ]
Qin, Gaowu [1 ]
Shi, Zhen [2 ]
Zhang, Xuefeng [1 ,2 ]
机构
[1] Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat MOE, Shenyang 110819, Peoples R China
[2] Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Inst Adv Magnet Mat, Hangzhou 310012, Peoples R China
基金
中国国家自然科学基金;
关键词
Microwave absorption; Electric-dipole; Substitution; Core@shell; Sulfur-oxygen doped; COMPLEX PERMITTIVITY; TOPOLOGICAL DEFECTS; RAMAN-SPECTROSCOPY; GRAPHENE; IRON; PERMEABILITY; FRAMEWORKS; THICKNESS; DISCHARGE; GRAPHITE;
D O I
10.1016/j.scib.2020.01.009
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
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.
引用
收藏
页码:623 / 630
页数:8
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