Atomic Valence Reversal-Induced Polarization Resonance Spurs Highly Efficient Electromagnetic Wave Absorption in α-Fe 2 O 3 @Carbon Microtubes

作者：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 · 发表于：Nano Letters · 年份：2024 · DOI：10.1021/acs.nanolett.4c00532 · 被引用次数：19 · 研究领域：Electromagnetic wave absorption materials、Advanced Antenna and Metasurface Technologies、Metamaterials and Metasurfaces Applications

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-Fe 2 O 3 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-Fe 2 O 3 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-Fe 2 O 3 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.