Issue 26, 2016

Magnetic graphene@PANI@porous TiO2 ternary composites for high-performance electromagnetic wave absorption

Abstract

A two-step strategy combining in situ polymerization and a hydrothermal process has been developed for coupling polyaniline (PANI) with porous TiO2 anchored on magnetic graphene. The microstructure and morphology of magnetic graphene@PANI@porous TiO2 were characterized by FETEM, FESEM, XRD, XPS and VSM in detail. The results indicated that magnetic graphene@PANI was completely covered by porous TiO2 with random orientations and the saturation magnetization value of the composite was 19.2 emu g−1. PANI was used to decrease the absorber thickness, while the porous TiO2 with a large surface area was designed to enhance the interaction between the electromagnetic (EM) wave and the absorber through multiple reflections, thus enhancing EM wave absorption properties. As an EM wave absorber, the maximum reflection loss of the composite was up to −45.4 dB due to the better normalized characteristic impedance (close to 1) at a thickness of only 1.5 mm and the absorption bandwidths exceeding −10 dB were 11.5 GHz when the thickness ranged from 1 to 3.5 mm. The excellent EM wave absorption performance was ascribed to the combined contribution from the enhanced dielectric relaxation processes, the unique porous nanostructures, the quarter-wave length matching model and the well-matched normalized characteristic impedance. Consequently, it is believed that the composite could be used as an excellent EM wave absorption material and the two-step strategy offered an effective way to design a high-performance EM wave absorber with a relatively thin thickness.

Graphical abstract: Magnetic graphene@PANI@porous TiO2 ternary composites for high-performance electromagnetic wave absorption

Article information

Article type
Paper
Submitted
27 Apr 2016
Accepted
06 Jun 2016
First published
17 Jun 2016

J. Mater. Chem. C, 2016,4, 6362-6370

Magnetic graphene@PANI@porous TiO2 ternary composites for high-performance electromagnetic wave absorption

P. Liu, Y. Huang, J. Yan and Y. Zhao, J. Mater. Chem. C, 2016, 4, 6362 DOI: 10.1039/C6TC01718E

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