Weibel, Alicia and Flaureau, Andréas
and Pham, Adeline
and Chevallier, Geoffroy
and Esvan, Jérôme
and Estournès, Claude
and Laurent, Christophe
One-step synthesis of few-layered-graphene/alumina powders for strong and tough composites with high electrical conductivity.
(2020)
Journal of the European Ceramic Society, 40 (15). 5779-5789. ISSN 0955-2219
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(Document in English)
PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 8MB |
Official URL: https://doi.org/10.1016/j.jeurceramsoc.2020.06.029
Abstract
The chemical vapor deposition of carbon onto a commercial α-Al2O3 powder bed produces a pristine film of few-layered-graphene (FLG) uniformly covering the α-Al2O3 grains. This obviates both the manipulation of nanocarbons, lengthy mixing steps and the risk of damaging any pre-existing graphene platelets. The powders are consolidated to 99 % by SPS, producing samples where a FLG film is located along the grain boundaries of the submicron α-Al2O3. Compared to the pure α-Al2O3, the composites are moderately stronger and similarly tough and hard due to crack-deflection and crack-bridging and they are electrically conducting with a percolation threshold below 0.74 vol.% of carbon. The high conductivity values reflect the high quality of the thin FLG film and its continuous nature over very long distances. The samples are characterized by Raman spectroscopy, X-ray photoelectron spectroscopy, scanning and transmission electron microscopy.
Item Type: | Article |
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HAL Id: | hal-03031659 |
Audience (journal): | International peer-reviewed journal |
Uncontrolled Keywords: | |
Institution: | French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) |
Laboratory name: | |
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Deposited On: | 15 Oct 2020 13:50 |
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