DOI: 10.1016/j.scib.2020.01.009
论文题名: Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties
作者: Li Y. ; Chen X. ; Wei Q. ; Liu W. ; Zhang Y. ; Qin G. ; Shi Z. ; Zhang X.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 8 起始页码: 623
结束页码: 630
语种: 英语
中文关键词: 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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169967
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Li Y.,Chen X.,Wei Q.,et al. Oxygen-sulfur Co-substitutional Fe@C nanocapsules for improving microwave absorption properties[J]. Science Bulletin,2020-01-01,65(8)