Issue 18, 2015

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

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

Supplementary files

Article information

Article type
Paper
Submitted
12 Feb 2015
Accepted
31 Mar 2015
First published
31 Mar 2015

J. Mater. Chem. C, 2015,3, 4670-4677

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements