Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 17, Pages 21786-21793Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.08.281
Keywords
Microwave-assisted method; Nickel sulfides; Graphene; Microwave absorption
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Funding
- National Natural Science Foundation of China [51672222]
- Spaceflight Innovation Foundation of China
- Spaceflight Foundation of China [2014-HT-XGD]
- Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University [ZZ2018190]
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In this work, an eco-friendly and convenient microwave-assisted synthesis technique was applied in the entire experiment course. The first obtained graphene-Ni composite possess an unsatisfactory microwave absorption capacity due to unbalanced matching nature. Then a sulfurization process was tried at different temperatures to convert Ni into NiS/Ni3S2, and an innovative graphene-NiS/Ni3S2 composite with a hierarchical architecture was fabricated under the condition of microwave irradiation. The investigation into microwave absorbing performances manifests that the absorption property of graphene-Ni can be obviously improved by sulfurization method. The results show, compared with graphene-Ni, the hierarchical-architecture graphene-NiS/Ni3S2 composites generated at 150 degrees C (S-150) possess excellent absorbing ability with a maximum RL as strong as - 55.1 dB at 6.0 GHz with a thickness of 2.7 mm, and the effective bandwidth covers 8.6 GHz from 2.8 to 11.4 GHz with thickness varies in 1.5-4.5 mm range. The enhanced performances for S-150 mainly derive from the synergy of superior impedance matching character, high attenuation, dielectric loss and plenteous interface polarizations.
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