Microwave-assisted synthesis of graphene-Ni composites with enhanced microwave absorption properties in Ku-band

Zetao Zhu, Xin Sun, Guoxian Li, Hairong Xue, Hu Guo, Xiaoli Fan, Xuchen Pan, Jianping He

Research output: Contribution to journalArticlepeer-review

154 Scopus citations

Abstract

Recently, graphene has been applied as a new microwave absorber because of its high dielectric loss and low density. Nevertheless, the high dielectric constant of pristine graphene has caused unbalanced electromagnetic parameters and results in a bad impedance matching characteristic. In this study, we report a facile microwave-assisted heating approach to produce reduced graphene oxide-nickel (RGO-Ni) composites. The phase and morphology of as-synthesized RGO-Ni composites are characterized by XRD, Raman, FESEM and TEM. The results show that Ni nanoparticles with a diameter around 20 nm are grown densely and uniformly on the RGO sheets. In addition, enhanced microwave absorption properties in Ku-band of RGO-Ni composites is mainly due to the synergistic effect of dielectric loss and magnetic loss and the dramatically electron polarizations caused by the formation of large conductive network. The minimum reflection loss of RGO-Ni-2 composite with the thickness of 2 mm can reaches -42 dB at 17.6 GHz. The RGO-Ni composite is an attractive candidate for the new type of high performance microwave absorbing material.

Original languageEnglish
Pages (from-to)95-103
Number of pages9
JournalJournal of Magnetism and Magnetic Materials
Volume377
DOIs
StatePublished - 1 Mar 2015
Externally publishedYes

Keywords

  • A. Graphene-Ni
  • B. Electronic polarization
  • C. Microwave absorption
  • D. Ku-band

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