Issue 6, 2015

Enhanced microwave absorption of ZnO coated with Ni nanoparticles produced by atomic layer deposition

Abstract

In this work, flower-like ZnO coated by Ni nanoparticles has been synthesized by the reduction of NiO-coated ZnO produced by an atomic layer deposition (ALD) method. The structure and electromagnetic (EM) absorption properties of the as-prepared samples are investigated. By applying 800 ALD cycles of NiO deposition followed by a reduction process, the surfaces of ZnO are densely covered by Ni nanoparticles with a narrow particle size distribution and an average size of 13.1 nm. ZnO@Ni exhibits remarkably improved EM absorption properties compared to ZnO. The optimal RL calculated from the measured complex permittivity and permeability is −48.0 dB at 10.4 GHz. Moreover, the EM wave absorption less than −10 dB is found to reach 5.3 GHz for an absorber thickness of 1.5 mm. The enhanced absorption ability arises from the effective combination of multiple dielectric–magnetic loss mechanisms.

Graphical abstract: Enhanced microwave absorption of ZnO coated with Ni nanoparticles produced by atomic layer deposition

Supplementary files

Article information

Article type
Paper
Submitted
09 Nov 2014
Accepted
11 Dec 2014
First published
11 Dec 2014

J. Mater. Chem. A, 2015,3, 2734-2740

Author version available

Enhanced microwave absorption of ZnO coated with Ni nanoparticles produced by atomic layer deposition

G. Wang, X. Peng, L. Yu, G. Wan, S. Lin and Y. Qin, J. Mater. Chem. A, 2015, 3, 2734 DOI: 10.1039/C4TA06053A

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