MOF-derived jujube pit shaped C/Co composites with hierarchical structure for electromagnetic absorption

• Published in: Journal of alloys and compounds Vol. 826; p. 154203
• Main Authors: Peng, Chenglei, Zhang, Yanan, Zhang, Baoshan
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.06.2020; Elsevier BV
• Subjects: Annealing; Attenuation; Composite materials; Electromagnetic absorption; Flakes; Hierarchical structure; Impedance matching; Jujube pit shaped; Magnetic-carbon composites; Metal-organic frameworks; Microwave absorbers; Microwave absorption; MOF-Derived; Structural hierarchy; Synthesis; Thickness; Microwave absorption; MOF-Derived; Magnetic-carbon composites; Jujube pit shaped; Hierarchical structure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.154203

A novel flake-assembled jujube pit shaped C/Co composites assembled by plentiful flakes has been successfully synthesized by annealing Co-based metal-organic frameworks (MOFs) at different temperatures. Owing to the optimal attenuation capacity, impedance matching and unique hierarchical structure, C/Co composites annealed at 600oC exhibited excellent reflection loss (RL) performance. The minimum RL value could reach −41 dB at 8.3 GHz with a matching thickness of 2.8 mm. Moreover, the effective bandwidth could reach 5.6 GHz (10.2∼15.8 GHz) with a matching thickness of only 2.0 mm. This study not only provides a promising microwave absorber but also develops a facile method to synthesize C/Co composites with regular hierarchical structure. [Display omitted] •A facile one-pot strategy was proposed to synthesize the novel jujube pit-like C/Co composites by the pyrolysis of MOF-derived precursors.•The C/Co composites were assembled by plentiful carbon sheets wrapped with Co nanoparticles. With the change of annealing temperature in this work, the structure of the C/Co composites did not collapse.•The minimum reflection loss of -41 dB and the effective bandwidth of 5.6 GHz could be reached when the pyrolysis temperature is 600o C.