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Vol. 14 (2022)

Identification of the Intrinsic Dielectric Properties of Metal Single Atoms for Electromagnetic Wave Absorption

https://doi.org/10.1007/s40820-021-00773-6
Xinci Zhang
Key Laboratory of In‑Fiber Integrated Optics, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, People’s Republic of China
Yanan Shi
Key Laboratory of In‑Fiber Integrated Optics, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, People’s Republic of China
Jia Xu
Key Laboratory of In‑Fiber Integrated Optics, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, People’s Republic of China
Qiuyun Ouyang
Key Laboratory of In‑Fiber Integrated Optics, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, People’s Republic of China
Xiao Zhang
Key Laboratory of In‑Fiber Integrated Optics, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, People’s Republic of China
Chunling Zhu
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, People’s Republic of China
Xiaoli Zhang
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
Yujin Chen
Key Laboratory of In‑Fiber Integrated Optics, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, People’s Republic of China

Corresponding Author: Yujin Chen

chenyujin@hrbeu.edu.cn

Nano-Micro Letters, Vol. 14 (2022), Article Number: 27

Abstract

Atomically dispersed metals on N-doped carbon supports (M–NxCs) have great potential applications in various fields. However, a precise understanding of the definitive relationship between the configuration of metal single atoms and the dielectric loss properties of M–NxCs at the atomic-level is still lacking. Herein, we report a general approach to synthesize a series of three-dimensional (3D) honeycomb-like M–NxC (M = Mn, Fe, Co, Cu, or Ni) containing metal single atoms. Experimental results indicate that 3D M–NxCs exhibit a greatly enhanced dielectric loss compared with that of the NC matrix. Theoretical calculations demonstrate that the density of states of the d orbitals near the Fermi level is significantly increased and additional electrical dipoles are induced due to the destruction of the symmetry of the local microstructure, which enhances conductive loss and dipolar polarization loss of 3D M–NxCs, respectively. Consequently, these 3D M–NxCs exhibit excellent electromagnetic wave absorption properties, outperforming the most commonly reported absorbers. This study systematically explains the mechanism of dielectric loss at the atomic level for the first time and is of significance to the rational design of high-efficiency electromagnetic wave absorbing materials containing metal single atoms.


Highlights:


1 A general method was developed to fabricate a series of honeycomb-like N-doped nanocarbons (3D M–NxC) doped with metal single atoms (Mn, Fe, Co, Cu, or Ni) with a high yield.
2 The intrinsic dielectric properties of 3D M–NxC were identified for the first time at the atomic-level, revealing that the introduction of metal single atoms greatly increases both conductive loss and polarization loss.
3 3D Mn–NC exhibited high-performance electromagnetic wave absorption at a low filler loading of 10 wt% outperforming most reported absorbers.

Keywords

Metal single atoms Dielectric loss behavior NaCl-templating method Lightweight absorbers Honeycomb-like N-doped nanocarbons
Zhang, Xinci, Yanan Shi, Jia Xu, Qiuyun Ouyang, Xiao Zhang, Chunling Zhu, Xiaoli Zhang, and Yujin Chen. 2021. “Identification of the Intrinsic Dielectric Properties of Metal Single Atoms for Electromagnetic Wave Absorption”. Nano-Micro Letters 14 (December):27. https://doi.org/10.1007/s40820-021-00773-6.
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