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Issue 39, 2014
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Graphene-wrapped ZnO hollow spheres with enhanced electromagnetic wave absorption properties

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Abstract

Graphene-wrapped ZnO hollow spheres were synthesized by a two-step process, which combined a hydrothermal reaction with surface modification. The experimental results show that reduced graphene oxide sheets adhere entirely to the surface of the ZnO hollow spheres consisting of nanoparticles. The unique structure effectively decreases the density of the composite without sacrificing the contact between graphene and the nanoparticles. Different mass ratios of graphene to ZnO hollow spheres mixed in a paraffin wax matrix (50 wt%) were prepared to investigate the electromagnetic wave absorption properties in the X-band region. When the mass ratio of graphene oxide to ZnO is 12 : 88, the composite exhibits a maximum absorption of −45.05 dB at 9.7 GHz with a sample thickness of only 2.2 mm. The fundamental mechanism based on electrical conductivity and the polarization between the graphene sheets and ZnO nanoparticles is discussed. The hierarchical structure of graphene-wrapped ZnO hollow spheres exhibits a promising designable approach to lightweight electromagnetic wave absorbing materials.

Graphical abstract: Graphene-wrapped ZnO hollow spheres with enhanced electromagnetic wave absorption properties

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Publication details

The article was received on 16 Jun 2014, accepted on 10 Aug 2014 and first published on 13 Aug 2014


Article type: Paper
DOI: 10.1039/C4TA03033H
Citation: J. Mater. Chem. A, 2014,2, 16403-16409

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    Graphene-wrapped ZnO hollow spheres with enhanced electromagnetic wave absorption properties

    M. Han, X. Yin, L. Kong, M. Li, W. Duan, L. Zhang and L. Cheng, J. Mater. Chem. A, 2014, 2, 16403
    DOI: 10.1039/C4TA03033H

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