Multi-shell bowl-like carbon microspheres for lightweight and broadband microwave absorption

doi:10.1016/j.jmst.2024.09.026

Abstract

Abstract: Carbon materials have made significant progress in the field of microwave absorption (MA), but achieving wide effective absorption bandwidth (EAB) at low filler content still remains a great challenge. In this work, we design multi-shell bowl-like mesoporous carbon microspheres (MBMCs) by a facile hard template method for efficient MA. It is demonstrated that the spacing between inner and outer shell and second shell thickness play a vital role on the configuration of carbon microspheres. By controlling the second addition of silica template, the microstructure of carbon microsphere evolves from spherical to bowl shape geometry. Expanded shell spacing is beneficial for forming bowl-like microsphere. The dielectric loss and MA properties are highly associated with the configuration of MBMCs. Well-proportioned MBMCs with appropriate shell spacing present wide EAB of 7.3 GHz under a low filling ratio of 12 wt.%. This work paves a new way to broaden EAB and lower filling content of carbon materials via asymmetric multilayer microstructure design.

Key words: Bowl-like, Multi-shell, Mesoporous, Carbon microsphere, Microwave absorption

Yan Cheng, Yongzhen Ma, Kai Zhou, Zhixin Cai, Yanlong Ma, Binglong Zheng, Huanqin Zhao, Hongwei Zhou, Haibo Yang, Renchao Che. Multi-shell bowl-like carbon microspheres for lightweight and broadband microwave absorption[J]. J. Mater. Sci. Technol., 2025, 220: 265-275.

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