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Wideband microwave absorption in thin nanocomposite films induced by a concentration gradient of mixed carbonaceous nanostructures

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Abstract

Absorption in excess of 90% is induced over a 22 GHz bandwidth by the combination of carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) dispersed in a polymer matrix. This performance is achieved by a stack of polymer films showing a concentration gradient of mixed CNTs and GNPs from layer to layer, having a total thickness of only \(0.76\,\lambda /4.\) Excellent agreement is observed from 18 to 40 GHz between the predicted and measured reflectivity and the resulting high absorption.

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Acknowledgements

The authors are grateful to the National Fund for Scientific Research (F.R.S.-FNRS, Belgium) for supporting this research. This work is also supported by the Walloon region, and by the “Communauté Française de Belgique”, through the Project “Nano4waves” funded by its Research Program “Actions de Recherche Concertées”. Special thanks are also due to Mr. H. Mesfin for the fabrication of the composite layers and to Professor A. Delcorte for fruitful discussions in the frame of the Nano4waves Project. The help of S. Bebelmans, D. Magnin, J. Mahy, W. Malik and P. Simon for the various characterizations was also highly appreciated.

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Authors and Affiliations

  1. ICTEAM Institute, ELEN Division, Université catholique de Louvain (UCLouvain), 3 place du Levant, 1348, Louvain-la-Neuve, Belgium

    R. Jaiswar, J. P. Raskin & I. Huynen

  2. IMCN Institute, BSMA Division, UCLouvain, place Croix du sud 1, 1348, Louvain-la-Neuve, Belgium

    C. Bailly

  3. IMCN Institute, MOST Division, UCLouvain, 1 place Lavoisier, 1348, Louvain-la-Neuve, Belgium

    S. Hermans

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  1. R. Jaiswar
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  2. C. Bailly
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  3. S. Hermans
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  4. J. P. Raskin
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  5. I. Huynen
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Correspondence to I. Huynen.

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Jaiswar, R., Bailly, C., Hermans, S. et al. Wideband microwave absorption in thin nanocomposite films induced by a concentration gradient of mixed carbonaceous nanostructures. J Mater Sci: Mater Electron 30, 19147–19153 (2019). https://doi.org/10.1007/s10854-019-02271-3

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  • DOI: https://doi.org/10.1007/s10854-019-02271-3

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