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The design and performance of the nano-carbon based double layers flexible coating for tunable and high-efficiency microwave absorption

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Abstract

Nanocarbon-based materials are outstanding microwave absorbers with good dielectric properties. In this study, double-layer silicone resin flexible absorbing coatings, composed of carbon-coated nickel nanoparticles (Ni@C) and carbon nanotubes (CNTs), with low loading and a total thickness of 2 mm, were prepared. The reflection loss (RL) of the double-layer absorbing coatings has measured for frequencies between 2 and 18 GHz using the Arch reflecting testing method. The effects of the thickness and electromagnetic parameters of each layer and of the layer sequence on the absorbing properties were investigated. It is found that the measured bandwidth (RL ≤ − 10 dB) of the optimum double-layer structure in our experiment range achieves 3.70 GHz. The results indicated that the double coating structure composed of different materials has greater synergistic absorption effect on impedance matching than that of same materials with different loading. The maximum RL of S1 (5 wt% CNTs)/S3 (60 wt% Ni@C) double-layer absorbing coating composed of different materials (S1 and S3) was larger than the one achieved using either S1 or S3 alone with the same thickness. This was because double-layer coating provided a suitable matching layer and improve the interfacial impedance. It was also shown that absorbing peak value and frequency position can be adjusted by double-layer coating structure.

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Acknowledgements

This work is supported by the Science and Technology Program of Guangdong Province of China (Grant nos: 2016A020221031, 2017B050504004), and by the Science and Technology Program of Guangzhou City of China (Grant nos: 201604030040).

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Authors and Affiliations

  1. School of Computer Science and Technology, Guangdong University of Technology, Guangzhou, 510006, China

    Danfeng Zhang, Zhifeng Hao & Bi Zeng

  2. School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China

    Yannan Qian, Haiping Zhu, Qibai Wu, Chengjie Yan & Muyu Chen

  3. Foshan University, Foshan, 528000, China

    Zhifeng Hao

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  1. Danfeng Zhang
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  2. Zhifeng Hao
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  3. Yannan Qian
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Correspondence to Danfeng Zhang or Zhifeng Hao.

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Zhang, D., Hao, Z., Qian, Y. et al. The design and performance of the nano-carbon based double layers flexible coating for tunable and high-efficiency microwave absorption. Appl. Phys. A 124, 374 (2018). https://doi.org/10.1007/s00339-018-1773-4

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