Facile and scalable preparation of Ni/NiO/SiO2@porous carbon network with strong and wide bandwidth microwave absorption

• Published in: Applied surface science Vol. 669; p. 160546
• Main Authors: Ji, Xixi, Wang, Hailin, Xu, Dan, Ye, Xin, Chen, Tianyao, Zhao, Niu, Hu, Yongle, Xie, Wei, Cao, Taishan, Tong, Yonggang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2024
• Subjects: Broadband absorption; Ku band; Microwave absorption; Porous structure; Ku band; Porous structure; Microwave absorption; Broadband absorption
• ISSN: 0169-4332
• DOI: 10.1016/j.apsusc.2024.160546

[Display omitted] •Ni/NiO/SiO2@PCN-0.05 achieves remarkable EMW absorption, reaching −71.42 dB at 2.6 mm thickness.•It achieves am EAB over 6.24 GHz at a thickness of 2.25 mm, effectively covering the entire Ku band.•It offers a cost-effective method for producing high-performance microwave absorbers.•It combines Ni/NiO and SiO2 particles within the PCN matrix and optimizes impedance matching. Researchers are exploring high-performance electromagnetic wave absorbing materials to mitigate electromagnetic interference, focusing on minimizing surface reflection and enhancing attenuation capability. However, one single component and structure struggle to meet the aforementioned requirements. Here, a Ni/NiO/SiO2@porous carbon network (Ni/NiO/SiO2@PCN) with porous structures is synthesized via a pyrolysis process. The magnetic Ni/NiO and dielectric SiO2 nanoparticles are uniformly dispersed within the PCN matrix. The absorption capability of the material can be controlled by adjusting the SiO2 content in Ni/NiO/SiO2@PCN. Particularly, when the SiO2 loading is 0.5 wt%, the resulting Ni/NiO/SiO2@PCN-0.05 demonstrates outstanding EMW absorption properties, exhibiting strong broadband absorption attributed to its 3D porous architectures, the hybrid composition of Ni/C, NiO/C, and SiO2/C, and good impedance matching. At a filler loading of 20 wt%, the Ni/NiO/SiO2@PCN-0.05 achieves remarkable EMW absorption performance, with a minimal reflection loss reaching −71.42 dB at 2.6 mm and 11.18 GHz, and an effective absorption band extending over 6.24 GHz within the frequency range of 11.52 to 18.0 GHz at a thickness of 2.25 mm, effectively covering the entire Ku band. This study introduces a cost-effective and efficient fabrication approach for producing high-performance microwave absorbers, thereby offering promising prospects for applications in the field of microwave telecommunications.