期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 50, 期 44, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aa88ea
关键词
microwave absorption; dielectric loss; Ni; SiC; nanocapsules
资金
- Natural Science Foundation of Anhui Province [1708085ME124]
- Foundation for Young Talents at the College of Anhui Province [gxyqZD2017037]
- Opening Project of the Key Laboratory of Metallurgical Emission Reduction & Resources Recycling [KF17-07]
The rapid development of microelectronic devices means increasing attention is being paid to the exploration of high-performance microwave absorption materials. Enhanced dielectric loss is an effective way of improving microwave absorption performance. Here, we report that Ni@C nanocapsules with ash-free carbon as a carbon source, functionalized by the doping of SiC in a thick defective graphitic shell, demonstrate enhanced dielectric losses at the gigahertz level, and energy transfer from permeability to permittivity at 14.24 GHz. Compared with Ni@C nanocapsules, which have ethanol as a carbon source, the same absorption band and absorption intensity can be obtained with a thinner absorber in the present Ni@C nanocapsules, and the frequency corresponding to maximum reflection loss exhibits a red shift for the same absorbing thickness. At 5.12 GHz, the maximum reflection loss value of the present Ni@C nanocapsules can reach -49.99 dB for a planar absorber with a thickness of 5.1 mm. Experimental results coupled with theoretical simulations reveal the electromagnetic losses of the present Ni@C nanocapsules originating from the core-shell interfacial polarization and dipole polarization of the doping of SiC in the defective graphitic shell.
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