Atomic Valence Reversal-Induced Polarization Resonance Spurs Highly Efficient Electromagnetic Wave Absorption in α-Fe2O3@Carbon Microtubes

Hengdong Ren; Tongshuai Zhu; Lei Feng; Qifan Wu; Ka Wang; Xinjie Yun; Haogang Zhu; Jian Chen; Baojun Wei; Hao Ni; Xiaobing Xu; Zhiyong Zhang; Xinglong Wu

doi:10.1021/acs.nanolett.4c00532

Atomic Valence Reversal-Induced Polarization Resonance Spurs Highly Efficient Electromagnetic Wave Absorption in α-Fe₂O₃@Carbon Microtubes

Nano Lett. 2024 Mar 20;24(11):3525-3531. doi: 10.1021/acs.nanolett.4c00532. Epub 2024 Mar 11.

Authors

Hengdong Ren¹, Tongshuai Zhu^{1

2

3}, Lei Feng¹, Qifan Wu¹, Ka Wang¹, Xinjie Yun¹, Haogang Zhu¹, Jian Chen⁴, Baojun Wei², Hao Ni², Xiaobing Xu⁵, Zhiyong Zhang¹, Xinglong Wu¹

Affiliations

¹ National Laboratory of Solid States Microstructures and School of Physics, Nanjing University, Nanjing 210093, China.
² College of Science, China University of Petroleum (East China), Qingdao 266580, China.
³ School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China.
⁴ National Laboratory of Solid States Microstructures and Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, China.
⁵ College of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing 211171, China.

PMID: 38466128
DOI: 10.1021/acs.nanolett.4c00532

Abstract

Variegation and complexity of polarization relaxation loss in many heterostructured materials provide available mechanisms to seek a strong electromagnetic wave (EMW) absorption performance. Here we construct a unique heterostructured compound that bonds α-Fe₂O₃ nanosheets of the (110) plane on carbon microtubes (CMTs). Through effective alignment between the Fermi energy level of CMTs and the conduction band position of α-Fe₂O₃ nanosheets at the interface, we attain substantial polarization relaxation loss via novel atomic valence reversal between Fe(III) ↔ Fe(III^-) induced with periodic electron injection from conductive CMTs under EMW irradiation to give α-Fe₂O₃ nanosheets. Such heterostructured materials possess currently reported minimum reflection loss of -84.01 dB centered at 10.99 GHz at a thickness of 3.19 mm and an effective absorption bandwidth (reflection loss ≤ -10 dB) of 7.17 GHz (10.83-18 GHz) at 2.65 mm. This work provides an effective strategy for designing strong EMW absorbers by combining highly efficient electron injection and atomic valence reversal.

Keywords: atomic valence reversal; electromagnetic wave absorption; electron transfer; polarization loss; polarization resonance.