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Chin. Phys. B, 2016, Vol. 25(4): 040201    DOI: 10.1088/1674-1056/25/4/040201
GENERAL   Next  

Theoretical calculation and experiment of microwave electromagnetic property of Ni(C) nanocapsules

Dan-Feng Zhang(张丹枫)1, Zhi-Feng Hao(郝志峰)1, Bi Zeng(曾碧)1, Yan-Nan Qian(钱艳楠)2, Ying-Xin Huang(黄颖欣)2, Zhen-Da Yang(杨振大)2
1 School of Computer Science and Technology, Guangdong University of Technology, Guangzhou 510006, China;
2 School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
Abstract  With the combination of the dielectric loss of the carbon layer with the magnetic loss of the ferromagnetic metal core, carbon-coated nickel (Ni(C)) nanoparticles are expected to be the promising microwave absorbers. Microwave electromagnetic parameters and reflection loss in a frequency range of 2 GHz-18 GHz for paraffin-Ni(C) composites are investigated. The values of relative complex permittivity and permeability, the dielectric and magnetic loss tangent of paraffin-Ni(C) composites are measured, respectively, when the weight ratios of Ni(C) nanoparticles are equal to 10 wt%, 40 wt%, 50 wt%, 70 wt%, and 80 wt% in paraffin-Ni(C) composites. The results reveal that Ni(C) nanoparticles exhibit a peak of magnetic loss at about 13 GHz, suggesting that magnetic loss and a natural resonance could be found at that frequency. Based on the measured complex permittivity and permeability, the reflection losses of paraffin-Ni(C) composites with different weight ratios of Ni(C) nanoparticles and coating thickness values are simulated according to the transmission line theory. An excellent microwave absorption is obtained. To be proved by the experimental results, the reflection loss of composite with a coating thickness of 2 mm is measured by the Arch method. The results indicate that the maximum reflection loss reaches -26.73 dB at 12.7 GHz, and below -10 dB, the bandwidth is about 4 GHz. The fact that the measured absorption position is consistent with the calculated results suggests that a good electromagnetic match and a strong microwave absorption can be established in Ni(C) nanoparticles. The excellent Ni(C) microwave absorber is prepared by choosing an optimum layer number and the weight ratio of Ni(C) nanoparticles in paraffin-Ni(C) composites.
Keywords:  microwave absorption      simulation      reflection loss      carbon-coated nickel nanoparticles      permittivity      permeability  
Received:  23 October 2015      Revised:  25 December 2015      Accepted manuscript online: 
PACS:  02.10.Ud (Linear algebra)  
  75.10.-b (General theory and models of magnetic ordering)  
Fund: Project supported by the Science and Technology Program of Guangdong Province, China (Grant Nos. 2014B010106005, 2013B051000077, and 2015A050502047) and the Science and Technology Program of Guangzhou City, China (Grant No. 201508030018).
Corresponding Authors:  Dan-Feng Zhang, Zhi-Feng Hao     E-mail:;

Cite this article: 

Dan-Feng Zhang(张丹枫), Zhi-Feng Hao(郝志峰), Bi Zeng(曾碧), Yan-Nan Qian(钱艳楠), Ying-Xin Huang(黄颖欣), Zhen-Da Yang(杨振大) Theoretical calculation and experiment of microwave electromagnetic property of Ni(C) nanocapsules 2016 Chin. Phys. B 25 040201

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