The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 2015
Filed:
Oct. 16, 2009
Laurent Baraton, Paris, FR;
Costel Sorin Cojocaru, Palaiseau, FR;
Didier Pribat, Sevres, FR;
ECOLE POLYTECHNIQUE, Palaiseau, FR;
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris, FR;
Abstract
The invention includes a controlled graphene film growth process including the production on the surface of a substrate of a layer of a metal having with carbon a phase diagram such that, above a molar concentration threshold ratio C/C+C, where Cis the molar metal concentration in a metal/carbon mixture and Cis the molar carbon concentration in the mixture, a homogeneous solid solution is obtained. The metal layer is exposed to a controlled flux of carbon atoms or carbon-containing radicals or carbon-containing ions at a temperature such that the molar concentration ratio obtained is greater than the threshold ratio to obtain a solid solution of carbon in the metal. The process further includes an operation for modifying the phase of the mixture into two phases, a metal phase and a graphite phase, leading to the formation of at least a lower graphene film at the metal layer incorporating carbon atoms-substrate interface and an upper graphene film at the surface of the metal layer.