A. Tamburrano, L. Paliotta, A. Rinaldi, G. De Bellis, M. S. Sarto
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RF shielding performance of thin flexible graphene nanoplatelets-based papers
Thin and flexible freestanding graphene nanoplatelets (GNPs)-based paper-like materials are fabricated and experimentally characterized to assess their employment as radiofrequency electromagnetic interference shields. Samples are obtained by vacuum filtration of ultrasonicated suspensions. Different suspensions are prepared by mixing either acetone/DMF or acetone/NMP and worm-like exfoliated graphite expanded at the temperature of 1150 °C or 1250 °C for 5s. We investigated the effect of thermal annealing and mechanical compression on the sheet resistance, thickness, dc electrical conductivity and electromagnetic shielding of the produced GNP papers. Their shielding effectiveness (SE) is measured in the frequency range 10 MHz-18 GHz and validated by simulations. Electrical conductivity of 144 kS/m and SE as high as 55 dB are reached for a few microns thick GNP paper subjected to a compression of 5 MPa.
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