Hollow porous CoNi/C composite nanomaterials derived from MOFs for efficient and lightweight electromagnetic wave absorber

• Published in: Carbon (New York) Vol. 167; pp. 485 - 494
• Main Authors: Wang, Yan-Li, Yang, Shu-Hao, Wang, Hui-Ya, Wang, Guang-Sheng, Sun, Xiao-Bo, Yin, Peng-Gang
• Format: Journal Article
• Language: English
• Published: New York Elsevier Ltd 15.10.2020; Elsevier BV
• Subjects: Absorbers; Absorption; Bimetallic carbon-based nanocomposites; Bimetals; carbon; coordination polymers; Current loss; Dipoles; Eddy current testing; Eddy currents; Electromagnetic radiation; Electromagnetics; Ferromagnetic resonance; Ferromagnetism; Graphene; Hollow porous structure; Impedance matching; Iron constituents; Lightweight; Metal-organic frameworks; Metallurgical constituents; Metal−organic framework (MOF); Microwave absorption; Nanocomposites; Nanomaterials; Polarization; Porous materials; Resonance scattering; surface area; Thermal decomposition; thermal degradation; Bimetallic carbon-based nanocomposites; Microwave absorption; Impedance matching; Hollow porous structure; Metal−organic framework (MOF)
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2020.06.014

The perfect control over the constituent and architecture of porous nanomaterials is still a significant challenge in developing high performance electromagnetic wave absorption materials. In this work, we have designed and prepared a novel lightweight electromagnetic wave absorption material with the combination of hollow structure and bimetallic constituents by the thermal decomposition of metal−organic framework (MOF) ZIF-67. We found that by introducing additional metal Nickle into the porous Co/C composites, the CoNi/C-800-PVDF nanocomposite could yield an excellent reflection loss of −61.02 dB at 13.68 GHz and simultaneously possess effective absorbing bandwidth of 5.2 GHz with lower filler loading as 10 wt%, which corresponding to a less absorber thickness of 2 mm. These results demonstrate that the synergistic effects between the bimetallic components and hollow structure of novel CoNi/C composite optimize impedance matching, and thus improve the absorption performance greatly. The properties of specific surface area, interface polarization, dipole polarization, ferromagnetic resonance, eddy current loss and multiple scattering are investigated to further explain the high performance of materials. [Display omitted] •Hollow porous structure bimetallic carbon-based nanocomposite (CoNi/C) with excellent electromagnetic wave absorption properties was successfully synthesized.•An excellent reflection loss (RL) of −61.02 dB at 13.68 GHz with a low filler loading (10 wt%) and ultra-thin thickness (2.00 mm).•Effective absorption bandwidth (<−10 dB) up to 5.2 GHz under a single thickness (2.00 mm).