MOF-derived porous hollow Ni/C composites with optimized impedance matching as lightweight microwave absorption materials

• Published in: Advanced composites and hybrid materials Vol. 4; no. 3; pp. 707 - 715
• Main Authors: Wu, Nannan, Zhao, Beibei, Liu, Jiyun, Li, Yaling, Chen, Yunbo, Chen, Lin, Wang, Meng, Guo, Zhanhu
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.09.2021
• Subjects: Ceramics; Chemistry and Materials Science; Composites; Glass; Materials Engineering; Materials Science; Natural Materials; Original Research; Polymer Sciences
• ISSN: 2522-0128; 2522-0136
• DOI: 10.1007/s42114-021-00307-z

Electromagnetic wave (EM) pollution caused by rapid development of electric devices has been threatening people’s lives. Thus, the need for high-performance and lightweight microwave absorption materials is becoming more and more urgent. In this concern, this paper reported the successful fabrication of Ni/C composites by adopting the MOF-derived method. The as-prepared Ni/C composites delivered porous and hollow structures with diameters of 1.0–2.0 μm. Their microwave absorption performances were investigated in calcination temperature ranges of 600–800 °C. When tested for microwave absorption, the porous hollow Ni/C microspheres displayed outstanding microwave absorption performances. With a filling ratio of 30 wt%, the porous hollow Ni/C microspheres obtained at 600 °C exhibited minimal reflection loss (RL) of − 32.3 dB at thickness of 1.5 mm. The effective bandwidth with RL below − 10 dB achieved 4.4 GHz with 1.61-mm thickness. For porous hollow Ni/C microspheres obtained at 700 °C, the optimal RL reached − 55.4 dB at 1.53 mm. The results could push the development of MOF-derived magnetic carbon materials as lightweight microwave absorbers with strong absorption. Graphical abstract