Nano-Micro Letters, Volume. 15, Issue 1, 220(2023)

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

Fushan Li1, Nannan Wu2, Hideo Kimura1, Yuan Wang3, Ben Bin Xu3、*, Ding Wang3, Yifan Li3, Hassan Algadi4,5, Zhanhu Guo3、**, Wei Du1、***, and Chuanxin Hou1、****
Author Affiliations
  • 1School of Environmental and Material Engineering, Yantai University, No. 30 Qingquan Road, Yantai, Shandong 264005, People’s Republic of China
  • 2School of Material Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
  • 3Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne NE1 8ST, UK
  • 4College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, People’s Republic of China
  • 5Department of Electrical Engineering, Faculty of Engineering, Najran University, 11001 Najran, Saudi Arabia
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    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 (RLmin) 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.


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    Fushan Li, Nannan Wu, Hideo Kimura, Yuan Wang, Ben Bin Xu, Ding Wang, Yifan Li, Hassan Algadi, Zhanhu Guo, Wei Du, Chuanxin Hou. Initiating Binary Metal Oxides Microcubes Electromagnetic Wave Absorber Toward Ultrabroad Absorption Bandwidth Through Interfacial and Defects Modulation[J]. Nano-Micro Letters, 2023, 15(1): 220

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    Paper Information

    Category: Research Articles

    Received: Jul. 1, 2023

    Accepted: Aug. 28, 2023

    Published Online: Dec. 15, 2023

    The Author Email: Xu Ben Bin (, Guo Zhanhu (, Du Wei (, Hou Chuanxin (