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Symmetrical polyhedron-bowl Co/CoO with hexagonal plate to forward electromagnetic wave absorption ability

Abstract

The symmetrical polyhedron-bowl (twin-hexagonal frustum-pyramid) structured Co/CoO products were prepared via a simple polyol reduction approach. The effects of reaction recipes (solvent constituents and reaction times) on the morphologies of Co/CoO products were detailly investigated. The microwave absorption performances of Co/CoO polyhedrons paraffin composites with various Co/CoO contents were also studied. The results showed that the Co/CoO polyhedrons paraffin composites present the enhanced microwave absorption properties with an increased Co/CoO content in the certain amount range. The reason is that the conductive networks are gradually formed to cause leakage current loss with increasing Co/CoO content. However, the large leakage current would induce impedance mismatch to prohibit microwaves enter into absorbers with the relatively high Co/CoO content. Thus, the Co/CoO polyhedrons paraffin composite with 50 wt% Co/CoO displays the excellent microwave absorption properties. The optimal reflection loss (RL) is -45.3 dB at 12.5 GHz with a thickness of 1.7 mm. The effective absorption (below -10 dB) bandwidth can be tuned in the frequency of 4.5-18.0 GHz with thickness of 1.0−4.0 mm. The multiple reflection and scattering caused by symmetrical polyhedron-bowl structure, the micro-capacitors formed between Co/CoO as electrodes and paraffin as a dielectric, and the interfacial polarization collectively contribute to microwave absorption abilities.

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Publication details

The article was received on 01 Oct 2018, accepted on 30 Nov 2018 and first published on 30 Nov 2018


Article type: Paper
DOI: 10.1039/C8CE01677A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Symmetrical polyhedron-bowl Co/CoO with hexagonal plate to forward electromagnetic wave absorption ability

    B. Zhao, Y. Li, J. Liu, L. Fan, K. Gao, Z. Bai, L. Liang, X. Guo and R. Zhang, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01677A

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