Journal
SYNTHETIC METALS
Volume 210, Issue -, Pages 165-170Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2015.09.022
Keywords
Polyaniline; Graphene; Ni; Composite materials; Electromagnetic absorption
Funding
- National Natural Science Youth Foundation of China [51303147]
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A ternary composite of Ni/polyaniline (PANI)/reduced graphene oxide (RGO) was synthesized via a two-step method, a facile hydrothermal route (Ni/RGO) in first step and followed by the in situ polymerization of PANI on the surface of Ni/RGO. The morphology and microstructure of as-prepared Ni/PANI/RGO composite were characterized by XRD, TEM and XPS. The results show that Ni nanoparticles with a diameter around 20-30 nm are grown on the RGO sheets and the coating layer of PANI covers over the surface of Ni/RGO composite. The as-prepared Ni/PANI/RGO composite shows enhanced electromagnetic absorption properties compared with Ni/RGO, which is mainly due to the synergistic effect of dielectric loss and magnetic loss and the enhanced interfacial effects. The maximum reflection loss of the ternary composite can reach -51.3 dB at 4.9 GHz and the absorption bandwidth with the reflection loss less than -10 dB is 3.1 GHz (from 3.3 to 6.4 GHz) with the thickness of 3.5 mm. When the thickness varies from 3 to 5 mm, all the maximum reflection losses are less than -20 dB. It is believed that such composite can serve as an attractive candidate for the new type of high performance microwave absorbing material. (C) 2015 Elsevier B.V. All rights reserved.
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