Highly ordered polycarbonate films containing parallel graphite nanoplatelets have been produced by squeezing the corresponding random nanocomposites in the melt. Orientation of the conductive fillers is observed in the plane of the film, i.e., perpendicular to the squeezing direction. It only appears above a critical concentration of 15 wt. % and results from a confinement effect. Oriented samples show a resonance-like sharp increase of the conductivity at a given frequency in the microwave region, with the possibility to control the value of this frequency and the resulting absorption by changing the nanoplatelets concentration. Above this frequency, the oriented polymer nanocomposites show a high level of electromagnetic absorption, which opens the possibility to tailor materials with effective electromagnetic interference shielding by absorption in selected frequency ranges. The in-plane stacking of conductive nanoplatelets separated by insulating polymer induces their strong capacitive coupling to the signal propagating in the plane of the polymer film. As a result, the equivalent circuit of this propagation becomes a resonant system composed of capacitors, inductors, and resistors, which agrees well with the experimental results.
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8 September 2014
Research Article|
September 10 2014
Frequency selective microwave absorption induced by controlled orientation of graphene-like nanoplatelets in thin polymer films
Henok Mebratie Mesfin;
Henok Mebratie Mesfin
1
Institute of Condensed Matter and Nanosciences (IMCN), Division of Bio and Soft Matter (BSMA), Croix du Sud 1, Université catholique de Louvain
, B-1348 Louvain-la-Neuve, Belgium
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A. C. Baudouin;
A. C. Baudouin
a)
1
Institute of Condensed Matter and Nanosciences (IMCN), Division of Bio and Soft Matter (BSMA), Croix du Sud 1, Université catholique de Louvain
, B-1348 Louvain-la-Neuve, Belgium
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Sophie Hermans;
Sophie Hermans
2
Institute of Condensed Matter and Nanosciences (IMCN), Division of Molecules, Solids and Reactivity (MOST), Place Louis Pasteur 1, Université catholique de Louvain
, B-1348 Louvain-la-Neuve, Belgium
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Arnaud Delcorte;
Arnaud Delcorte
1
Institute of Condensed Matter and Nanosciences (IMCN), Division of Bio and Soft Matter (BSMA), Croix du Sud 1, Université catholique de Louvain
, B-1348 Louvain-la-Neuve, Belgium
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Isabelle Huynen;
Isabelle Huynen
3
Institute of Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM), Place du Levant 3, Université catholique de Louvain
, B-1348 Louvain-la-Neuve, Belgium
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Christian Bailly
Christian Bailly
b)
1
Institute of Condensed Matter and Nanosciences (IMCN), Division of Bio and Soft Matter (BSMA), Croix du Sud 1, Université catholique de Louvain
, B-1348 Louvain-la-Neuve, Belgium
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a)
Present address: AGC glass Europe, 15 rue Blériot, Gosselies, Belgium.
b)
Electronic mail: [email protected]
Appl. Phys. Lett. 105, 103105 (2014)
Article history
Received:
August 12 2014
Accepted:
August 30 2014
Citation
Henok Mebratie Mesfin, A. C. Baudouin, Sophie Hermans, Arnaud Delcorte, Isabelle Huynen, Christian Bailly; Frequency selective microwave absorption induced by controlled orientation of graphene-like nanoplatelets in thin polymer films. Appl. Phys. Lett. 8 September 2014; 105 (10): 103105. https://doi.org/10.1063/1.4895674
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