Initiating Binary Metal Oxides Microcubes Electrsomagnetic Wave Absorber Toward Ultrabroad Absorption Bandwidth Through Interfacial and Defects Modulation

Fushan Li; Nannan Wu; Hideo Kimura; Yuan Wang; Ben Bin Xu; Ding Wang; Yifan Li; Hassan Algadi; Zhanhu Guo; Wei Du; Chuanxin Hou

doi:10.1007/s40820-023-01197-0

Initiating Binary Metal Oxides Microcubes Electrsomagnetic Wave Absorber Toward Ultrabroad Absorption Bandwidth Through Interfacial and Defects Modulation

Nanomicro Lett. 2023 Oct 9;15(1):220. doi: 10.1007/s40820-023-01197-0.

Authors

Fushan Li¹, Nannan Wu², Hideo Kimura¹, Yuan Wang³, Ben Bin Xu⁴, Ding Wang³, Yifan Li³, Hassan Algadi^{5

6}, Zhanhu Guo⁷, Wei Du⁸, Chuanxin Hou⁹

Affiliations

¹ School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai, Shandong, 264005, People's Republic of China.
² School of Material Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, People's Republic of China.
³ Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK.
⁴ Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK. ben.xu@northumbria.ac.uk.
⁵ College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, People's Republic of China.
⁶ Department of Electrical Engineering, Faculty of Engineering, Najran University, 11001, Najran, Saudi Arabia.
⁷ Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK. zhanhu.guo@northumbria.ac.uk.
⁸ School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai, Shandong, 264005, People's Republic of China. duwei@ytu.edu.cn.
⁹ School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai, Shandong, 264005, People's Republic of China. chuanxin210@ytu.edu.cn.

Abstract

Cobalt nickel bimetallic oxides (NiCo₂O₄) have received numerous attentions in terms of their controllable morphology, high temperature, corrosion resistance and strong electromagnetic wave (EMW) absorption capability. However, broadening the absorption bandwidth is still a huge challenge for NiCo₂O₄-based absorbers. Herein, the unique NiCo₂O₄@C core-shell microcubes with hollow structures were fabricated via a facile sacrificial template strategy. The concentration of oxygen vacancies and morphologies of the three-dimensional (3D) cubic hollow core-shell NiCo₂O₄@C framework were effectively optimized by adjusting the calcination temperature. The specially designed 3D framework structure facilitated the multiple reflections of incident electromagnetic waves and provided rich interfaces between multiple components, generating significant interfacial polarization losses. Dipole polarizations induced by oxygen vacancies could further enhance the attenuation ability for the incident EM waves. The optimized NiCo₂O₄@C hollow microcubes exhibit superior EMW absorption capability with minimum RL (RL_min) of -84.45 dB at 8.4 GHz for the thickness of 3.0 mm. Moreover, ultrabroad effective absorption bandwidth (EAB) as large as 12.48 GHz (5.52-18 GHz) is obtained. This work is believed to illuminate the path to synthesis of high-performance cobalt nickel bimetallic oxides for EMW absorbers with excellent EMW absorption capability, especially in broadening effective absorption bandwidth.

Keywords: Effective absorption bandwidth; Electromagnetic wave absorber; NiCo2O4@C Microcubes; Oxygen vacancy.