Preparation of graphene by mechanically thinning graphite materials
AssigneesCentre National De La Recherche Scientifique, Universite De Strasbourg
InventorsIzabela Janowska, Dominique Begin, Kambiz Chizari, Ovidiu Ersen, Pierre Bernhardt, Thierry Romero, Marc Ledoux, Cuong Pham-Huu
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Abstract
The preparation of graphene, mono-, bi- and multi-layers from graphite-based precursor materials, for example, pencil lead or graphite, by a method of mechanical thinning on the surface of a planar substrate with controlled roughness, followed by sonication in order to collect the graphene deposited on the substrate in a liquid medium. The bearing force during thinning by mechanical friction enables the number of graphene sheets deposited on the surface of the substrate to be controlled.
Claims20
A method for producing a dispersion of one of graphene particles and graphene sheets in a liquid medium, the method comprising:
- providing a graphite-based material including at least 10% by mass of graphite;
- rubbing the surface of said graphite-based material on the surface of a substrate so as to create a trace of friction of said graphite-based material on said surface of said substrate;
- and then
- soaking said substrate in a liquid medium and subjecting said liquid medium to ultrasound in order to detach said trace from said surface of said substrate to obtain a dispersion of the one of graphene particles and graphene sheets in said liquid medium after rubbing the surface of said graphite-based material.
A device for producing a dispersion of one of graphene particles and graphene sheets in a liquid medium, the device comprising:
- means for holding a graphite-based material including at least 10% by mass of graphite;
- a substrate equipped with a surface configured for contact with said graphite-based material;
- means for enabling a relative displacement between said graphite-based material and said substrate;
- means for one of regulating, controlling and measuring a pressure force between said graphite-based material and said surface of said substrate;
- a liquid container for receiving a liquid and configured to permit at least a partial immersion of said surface of said substrate in said liquid;
- and
- an ultrasound generator configured to subject said liquid to ultrasound waves.
Dependencies are inferred from the claim text.