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Non-magnetic hollow ZnO/C fabricated by a novel ZnO self-sacrificial template hollow engineering for efficient microwave absorption.

Authors :
Cai, Haopeng
Lin, Zhenqin
Gao, Lihua
Feng, Chaochao
Tang, Rui
Source :
Journal of Materials Science. Apr2024, Vol. 59 Issue 13, p5371-5386. 16p.
Publication Year :
2024

Abstract

The derivatives of metal–organic frameworks have been proven to be ideal candidates for microwave absorption due to their ability to form diverse microstructures of metals/heteroatom doped-carbon composites. In this study, we synthesized three types of zinc oxide (ZnO)@ZIF-8 with varying ZIF-8 shell thicknesses using ZnO colloidal spheres as sacrificial templates. Subsequently, we investigated the microwave absorption properties of a series of non-magnetic ZnO/N-doped carbon nanospheres pyrolyzed by ZnO@ZIF-8 at different temperatures. Remarkably, the non-magnetic samples (30 wt% filler loading) with a hollow structure pyrolyzed at 800 °C exhibited a broad effective absorption band exceeding 6 GHz. The excellent microwave absorbing performance of the samples pyrolyzed at 800 °C can be attributed to the reduction of the ZnO core to Zn0, anchoring it in the graphitized N-carbon layer, and the formation of an inner hollow cavity that enhances impedance matching. Therefore, this research not only provides an array of excellent dielectric-type microwave absorbing materials but also presents a novel strategy for developing lightweight and high-performance non-magnetic carbon-based microwave absorbing materials. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00222461
Volume :
59
Issue :
13
Database :
Academic Search Index
Journal :
Journal of Materials Science
Publication Type :
Academic Journal
Accession number :
177350130
Full Text :
https://doi.org/10.1007/s10853-024-09513-8