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Heterogeneous Interface Induced the Formation of Hierarchically Hollow Carbon Microcubes against Electromagnetic Pollution
Author(s) -
Zhao Honghong,
Xu Xianzhu,
Wang Yahui,
Fan Dingge,
Liu Dawei,
Lin Kaifeng,
Xu Ping,
Han Xijiang,
Du Yunchen
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202003407
Subject(s) - materials science , reflection loss , carbon fibers , microporous material , pyrolysis , microwave , porosity , mesoporous material , composite material , nanotechnology , shrinkage , microstructure , chemical engineering , computer science , composite number , telecommunications , biochemistry , chemistry , engineering , catalysis
Abstract Carbon materials with multilevel structural features are showing great potentials in electromagnetic (EM) pollution precaution. With ZIF‐67 microcubes as a self‐sacrificing precursor, hierarchical carbon microcubes with micro/mesoporous shells and hollow cavities have been successfully fabricated with the assistance of rigid SiO 2 coating layers. It is found that the SiO 2 layer can effectively counteract the inward shrinkage of organic frameworks during high‐temperature pyrolysis due to intensive interfacial interaction. The obtained hollow porous carbon microcubes (HPCMCs) exhibit larger Brunauer–Emmett–Teller surface area and pore volume than porous carbon microcubes (PCMCs) directly derived from ZIF‐67 microcubes. The unique microstructure is confirmed to be favorable for conductive loss and interfacial polarization, thus boosting the overall dielectric loss capability of carbon materials. Besides, hollow cavity will also promote multiple reflection of incident EM waves and intensify the dissipation of EM energy. As expected, HPCMCs harvest better microwave absorption performance, including strong reflection loss intensity and broad response bandwidth, than many traditional microporous/mesoporous carbon materials. This study provides a new strategy for the construction of hierarchical carbon materials and may inspire the design of carbon‐based composites with excellent EM functions.