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