Exploring the Ni 3d Orbital Unpaired Electrons Induced Polarization Loss Based on Ni Single‐Atoms Model Absorber

Single‐atoms (SAs) strategies have been proved to be effective in modulating electromagnetic wave (EMW) absorption, however, the establishment of a definitive relationship between metal SAs electronic configurations and physical loss mechanisms has been still absent, especially on the atomic scale....

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Veröffentlicht in:Advanced functional materials 2023-02, Vol.33 (7), p.n/a
Hauptverfasser: Liang, Hongsheng, Chen, Geng, Liu, Dong, Li, Zijing, Hui, Shengchong, Yun, Jijun, Zhang, Limin, Wu, Hongjing
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container_issue 7
container_start_page
container_title Advanced functional materials
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creator Liang, Hongsheng
Chen, Geng
Liu, Dong
Li, Zijing
Hui, Shengchong
Yun, Jijun
Zhang, Limin
Wu, Hongjing
description Single‐atoms (SAs) strategies have been proved to be effective in modulating electromagnetic wave (EMW) absorption, however, the establishment of a definitive relationship between metal SAs electronic configurations and physical loss mechanisms has been still absent, especially on the atomic scale. Herein, stable Ni‐SAsx/N‐doped carbon (NC) absorbers are fabricated with the strategy of ligand polymerization. The morphology, composition, electrical conductivity, defects, and electronic interactions of the material can be well tailored by Ni species modulation engineering. Theoretical and experimental results show that the atomically dispersed individual Ni atoms contribute to enhanced EMW absorption performance through excess Ni 3d orbital unpaired electron induced polarization loss. Benefiting from it, Ni‐SAs3/NC with the highest Ni SAy‐Nx (y > 1, x > 1) polar/defect centers exhibit excellent EMW absorption with an effective absorption bandwidth of 7.08 GHz at a matched thickness of 2.50 mm. Radar cross‐section simulations further demonstrate its potential for practical application as EMW absorber. This study reveals the continuous evolution of microscopic electromagnetic loss mechanism (i.e., conduction loss→ unique polarization loss→ conduction loss) for the first time, which provides insight into the deep design of absorbers from atom‐scale view. The stable Ni single‐atoms (SAs)x/N‐doped carbon (NC) absorbers are fabricated with the strategy of ligand polymerization. The continuous evolution of the microscopic electromagnetic loss mechanism (conduction loss→ Ni 3d orbital unpaired electrons induced polarization loss → conduction loss) based on the Ni single‐atoms model absorber is revealed for the first time.
doi_str_mv 10.1002/adfm.202212604
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Herein, stable Ni‐SAsx/N‐doped carbon (NC) absorbers are fabricated with the strategy of ligand polymerization. The morphology, composition, electrical conductivity, defects, and electronic interactions of the material can be well tailored by Ni species modulation engineering. Theoretical and experimental results show that the atomically dispersed individual Ni atoms contribute to enhanced EMW absorption performance through excess Ni 3d orbital unpaired electron induced polarization loss. Benefiting from it, Ni‐SAs3/NC with the highest Ni SAy‐Nx (y &gt; 1, x &gt; 1) polar/defect centers exhibit excellent EMW absorption with an effective absorption bandwidth of 7.08 GHz at a matched thickness of 2.50 mm. Radar cross‐section simulations further demonstrate its potential for practical application as EMW absorber. 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subjects Absorbers
Absorption
Conduction losses
Defects
Electrical resistivity
Electromagnetic losses
Electromagnetic radiation
electromagnetic wave absorptions
Electrons
Induced polarization
Materials science
microscopic electromagnetic loss mechanisms
Ni single‐atoms
unique polarization losses
title Exploring the Ni 3d Orbital Unpaired Electrons Induced Polarization Loss Based on Ni Single‐Atoms Model Absorber
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