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

作     者：Xinci Zhang Yanan Shi Jia Xu Qiuyun Ouyang Xiao Zhang Chunling Zhu Xiaoli Zhang Yujin Chen Xinci Zhang;Yanan Shi;Jia Xu;Qiuyun Ouyang;Xiao Zhang;Chunling Zhu;Xiaoli Zhang;Yujin Chen

作者机构：Key Laboratory of In‑Fiber Integrated OpticsCollege of Physics and Optoelectronic EngineeringHarbin Engineering UniversityHarbin 150001People’s Republic of China College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001People’s Republic of China School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001People’s Republic of China 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2022年第14卷第2期

页      面：107-123页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financial supports from the NNSF of China(Grant No.51972077) the Fundamental Research Funds for the Central Universities(Grant No.3072020CF2518,3072020CFT2505 3072021CFT2506,3072021CF2523 and 3072021CF2524) Heilongjiang Touyan Innovation Team Program. 

主　　题：Metal single atoms Dielectric loss behavior NaCl-templating method Lightweight absorbers Honeycomb-like N-doped nanocarbons 

摘      要：Atomically dispersed metals on N-doped carbon supports(M-N_(xCs)) 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-N_(xCs) at the atomic-level is still lacking.Herein,we report a general approach to synthesize a series of three-dimensional(3D)honeycomb-like M-N_xC(M=Mn,Fe,Co,Cu,or Ni) containing metal single atoms.Experimental results indicate that 3D M-N_(xCs) 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-N_(xCs),respectively.Consequently,these 3D M-N_(xCs) 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.