Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 6, Pages 2734-2740Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta06053a
Keywords
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Funding
- National Natural Science Foundation of China [51362010, 21376256]
- Natural Science Foundation of Hainan Province [514207, 514212]
- Scientific Research Projects of Colleges and Universities of Hainan Province [HNKY2014-14]
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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.
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