Research Article

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2018, 11(8): 4169–4182

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https://doi.org/10.1007/s12274-018-2006-z

Yolk-shell structured Co-C/Void/Co9S8 composites with a tunable cavity for ultrabroadband and efficient lowfrequency microwave absorption

Xiaofang Liu1 (*), Chengcheng Hao1, Lihua He2,1, Cheng Yang2, Yubin Chen2, Chengbao Jiang1, and Ronghai Yu1

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1 School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2 Beijing Institute of Aeronautical Materials, Beijing 100095, China

Keywords: yolk-shell structure, metal organic framework, sulfide, microwave absorption, broad bandwidth
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ABSTRACT A yolk–shell structured Co-C/Void/Co9S8 ternary composite composed of a Co nanoparticle-embedded porous carbon core and Co9S8 shell was synthesized by the sulfidation of a Co-based zeolitic imidazolate framework and subsequent pyrolysis. The composition and interior cavity of the Co-C/Void/Co9S8 composite could be precisely modulated by controlling the sulfidation reaction. Due to the abundant heterointerfaces, well-controlled cavity, and magnetic–dielectric synergistic effects, the Co-C/Void/Co9S8 exhibited excellent and tunable microwaveabsorbing properties. The optimized Co-C/Void/Co9S8, having a loading of 25 wt.% and thickness only 2.2 mm, displayed an ultrabroad absorption bandwidth of 8.2 GHz at high frequencies. Moreover, the composite could achieve an extremely high reflection loss of –54.02 dB at low frequencies by adjusting its loading to 30 wt.%. This study provides a new insight into promising lightweight microwave-absorbing materials with ultrabroad absorption bandwidths and strong low-frequency absorption.
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Yolk-shell structured Co-C/Void/Co9S8 composites with a tunable cavity for ultrabroadband and efficient lowfrequency microwave absorption. Nano Res. 2018, 11(8): 4169–4182 https://doi.org/10.1007/s12274-018-2006-z

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