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One-step synthesis of few-layered-graphene/alumina powders for strong and tough composites with high electrical conductivity

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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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
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)
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Deposited On:15 Oct 2020 13:50

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