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Issue 18, 2015
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Enhanced permittivity and multi-region microwave absorption of nanoneedle-like ZnO in the X-band at elevated temperature

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Abstract

We fabricated nanoneedle-like ZnO (ZnOn) by a facile combustion synthesis route, demonstrating the original observations on the complex permittivity of ZnOn ranging from 298 to 573 K and in the X band. Both real and imaginary permittivities (ε′ and ε′′) of ZnOn depend on temperature and frequency. The ε′ increases while the ε′′ possesses a maximum value with increasing temperature. The maximum value of ε′′ appears at 473 K, and the corresponding loss tangent increases by 100% than that at 298 K. The relaxations in ε′′ mainly arise from dipole polarization and interfacial polarization in ZnOn. Multi-region microwave absorption of ZnOn appears at the investigated temperature and frequency as well as thickness. The minimum reflection loss value reaches −44 dB, which is superior to the previous reports. These findings provide a novel and feasible strategy to tune microwave absorption towards a structural absorber at elevated temperature.

Graphical abstract: Enhanced permittivity and multi-region microwave absorption of nanoneedle-like ZnO in the X-band at elevated temperature

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Publication details

The article was received on 12 Feb 2015, accepted on 31 Mar 2015 and first published on 31 Mar 2015


Article type: Paper
DOI: 10.1039/C5TC00426H
J. Mater. Chem. C, 2015,3, 4670-4677

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    Enhanced permittivity and multi-region microwave absorption of nanoneedle-like ZnO in the X-band at elevated temperature

    J. Liu, W. Cao, H. Jin, J. Yuan, D. Zhang and M. Cao, J. Mater. Chem. C, 2015, 3, 4670
    DOI: 10.1039/C5TC00426H

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