Macroscopic electromagnetic synergy network-enhanced N-doped Ni/C gigahertz microwave absorber with regulable microtopography

• Published in: Nano research 2023-07, Vol.16 (7), p.10666-10677
• Main Authors: Pan, Yuelei, Zhu, Qianqian, Zhu, Jiahui, Cheng, Yuhang, Yu, Bowen, Jia, Zirui, Wu, Guanglei
• Format: Article
• Language: English
• Subjects: Absorption; Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; Carbon; Chemistry and Materials Science; Condensed Matter Physics; Dielectric loss; Electromagnetic radiation; EM Wave Functional Materials; High temperature; Materials Science; Microwave absorbers; Molybdenum; Nanostructure; Nanotechnology; Nickel; Quantum dots; Research Article; Synergistic effect; Thickness
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-023-5687-x

To achieve excellent electromagnetic wave (EMW) absorption properties, the microstructure design of the absorber is critical. In this work, six kinds of N-Ni/C nanostructures with different morphologies were prepared by one-step hydrothermal method and high temperature carbonization by adjusting the types of nickel salts and reaction solvents. The EMW absorption performance of six different morphologies of N-Ni/C nanostructures was compared and analyzed. Among them, it is found that the nanoflower-like N-Ni/C composite has excellent dielectric loss and magnetic loss synergistic effect due to its polycrystalline structure, and can obtain excellent EMW absorption performance. The minimum reflection loss value at a thickness of 1.9 mm is −59.56 dB at 16.88 GHz, and the effective absorption bandwidth value reaches 6.0 GHz at a thickness of 2.2 mm. Our research shows that different morphologies and multiple lattice structures of nanostructures with the same composition have a significant influence on EMW absorption performance, which provides new research ideas for developing high-performance EMW absorbing materials.