Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 29, Issue 20, Pages 17483-17492Publisher
SPRINGER
DOI: 10.1007/s10854-018-9848-8
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Funding
- National Natural Science Foundation of China (CN) [51601120]
- Science technology program of Shen Yang, China [F14-231-1-25]
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An arc-discharge method together with in-situ self-polymerization method was adopted to synthesize Ni@C/NC nanocapsules. With this method, the Ni@C/NC nanocapsules with enhanced microwave absorption properties were obtained. This enhanced microwave absorption property is due to the modification on Ni@C nanocapsule with accreted N-doped C shell on its surface. The microstructure and microwave absorption property of as-prepared nanocapsules were studied in detail. A reflection loss (RL) below - 20 dB is obtained in the wide frequency range of 4.4-18 GHz of Ni@C/NC nanocapsules, when an appropriate absorber thickness from 1.5 to 5.2 mm is chosen. An optimal RL value - 38.3 dB is observed at 11.7 GHz on Ni@C/NC nanocapsules-paraffin composites with an absorber thickness of 2.4 mm. Moreover, the amplitude of RL values of Ni@C/NC nanocapsules is about 2-3 times as many as that of Ni@C nanocapsules within absorber thickness ranging from 1.5 to 5.2 mm. This result shows that N-doped graphite C accreted on the surface of Ni@C nanocapsules could induce strong dielectric resonance and increase permittivity values of the Ni@C/NC nanocapsules. As a result, microwave absorbing performance of the Ni@C/NC nanocapsules is significantly enhanced.
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