Journal ArticleDOI
Waxberry-like hierarchical Ni@C microspheres with high-performance microwave absorption
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TLDR
In this article, the effects of pyrolysis temperature on the microstruture, carbon content, relative graphitization degree, magnetic properties, and electromagnetic parameters were carefully investigated.Abstract:
The rational design of the microstructure of magnetic carbon-based composites has become a popular strategy to enhance their microwave absorption properties. Herein, with Ni-containing metal–organic framework as the self-sacrificing precursor, we have successfully prepared waxberry-like Ni@C microspheres as novel microwave absorbing materials, which artfully integrated the advantages of core–shell configuration and hierarchical architecture. The effects of the pyrolysis temperature on the microstruture, carbon content, relative graphitization degree, magnetic properties, and electromagnetic parameters were carefully investigated. The composite that was pyrolyzed at 700 °C (Ni@C-700) exhibited desirable microwave absorption performance, including a strong reflection loss intensity of −73.2 dB and a broad qualified bandwidth of 4.8 GHz with an applied thickness of 1.8 mm. The electromagnetic analysis revealed that such good performance of Ni@C-700 was benefited from both the well-matched impedance and decent attenuation ability. The superiority of this unique microstruture was also validated by comparing it with some homologous composites and isolated core–shell Ni@C nanoparticles. It is believed that these results may provide a new pathway to promote the electromagnetic applications of conventional magnetic carbon-based composites by optimizing their microstructure.read more
Citations
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Journal ArticleDOI
Hollow Ni/C microspheres derived from Ni-metal organic framework for electromagnetic wave absorption
TL;DR: In this paper, a hollow nickel/carbon (Ni/C) microsphere was synthesized by in situ pyrolysis of the Ni-based trimellitic acid framework (Ni-MOF) at argon atmosphere.
Journal ArticleDOI
Review on the electromagnetic interference shielding properties of carbon based materials and their novel composites: Recent progress, challenges and prospects
Nannan Wu,Qian Hu,Qian Hu,Renbo Wei,Xianmin Mai,Nithesh Naik,Duo Pan,Duo Pan,Zhanhu Guo,Zhengjun Shi +9 more
TL;DR: In this paper, a review of recent achievements for carbon materials with different microstructures as electromagnetic interference shielding materials (ESMs) and microwave absorption materials (MAMs) during the past five years is presented.
Journal ArticleDOI
MOFs derived magnetic porous carbon microspheres constructed by core-shell Ni@C with high-performance microwave absorption
TL;DR: In this article, a series of metal-organic-frameworks (MOFs) derived magnetic porous carbon microspheres with tunable diameter and high specific surface area have been synthesized via a pyrolysis process.
Journal ArticleDOI
Diverse Metal–Organic Framework Architectures for Electromagnetic Absorbers and Shielding
Journal ArticleDOI
A review on carbon/magnetic metal composites for microwave absorption
TL;DR: In this article, the authors introduce the mechanisms of microwave absorption and summarize the recent advances in carbon/magnetic metal composites, and discuss the preparation methods and microwave absorption properties of different components, morphologies and microstructures.
References
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Journal ArticleDOI
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Journal ArticleDOI
CoNi@SiO2@TiO2 and CoNi@Air@TiO2 Microspheres with Strong Wideband Microwave Absorption
TL;DR: Owing to the magnetic-dielectric synergistic effect, the obtained CoNi@SiO2 @TiO2 microspheres exhibit outstanding microwave absorption performance with a maximum reflection loss of -58.2 dB and wide bandwidth of 8.1 GHz.
Journal ArticleDOI
Temperature dependent microwave attenuation behavior for carbon-nanotube/silica composites
Bo Wen,Mao-Sheng Cao,Zhi-Ling Hou,Wei-Li Song,Lu Zhang,Ming-Ming Lu,Haibo Jin,Xiao-Yong Fang,Wenzhong Wang,Jie Yuan +9 more
TL;DR: In this paper, the authors evaluated the dielectric properties and microwave attenuation performances over the full X-band (8.2-12.4 GHz) at a wide temperature ranging from 100 to 500 °C.