▎ 摘　　要

NOVELTY - A graphene film is obtainable by: a) providing a substrate, b) epitaxially growing a metal layer on a surface of the substrate, c) optionally increasing the thickness of the metal layer obtained in step (b) by growing a metal onto the epitaxially grown metal layer, d) peeling off the metal layer obtained in step (b) or optionally in step (c) from the substrate and e) depositing graphene onto at least a part of that surface of the metal layer obtained in step (d), which is in contact with the substrate before the peeling off conducted in step (d). USE - As graphene film used in an electrode preferably in a capacitor, lithium battery, fuel cell, hydrogen gas storage, solar cell, heat controlling assembly or energy storage system, in an electronic device, preferably as a transparent electrode, in a touch screen display, in thermal management, in a gas sensor, in a transistor or in a memory device, or in a laser, such as tunable fiber mode-locked laser, solid-state mode-locked laser or passively mode-locked semiconductor laser, or in a photodetector, polarization controller or optical modulator, in a coating, preferably in an anti-icing coating, in a wear-resistant coating, in a self-cleaning coating or in an antimicrobial coating, in a building construction, preferably in a structural reinforcement for automotives an constructions, as catalyst, as an anti-microbial packaging, as a graphene rubber, as a sporting good, as an isolator, or as a sensor, preferably a biosensor, such as for measuring a magnetic field, for DNA sequencing, for monitoring the velocity of surrounding liquid or for a strain gauge (claimed). ADVANTAGE - The high-quality graphene film has large graphene domain size, an excellent optical transparency and improved charge carrier mobility as well as a high thermal conductivity, an excellent tensile strength and a high modulus of elasticity. The graphene film comprises very large graphene domains, has an excellent lattice quality and has an excellent optical transparency. The graphene film has a charge carrier mobility of more than 11000 cm2/V.second, when measured via the field effect characteristics of graphene on a silica (SiO2) substrate (preferably has a mobility of at least 15000 cm2/V.second, especially at least 20000 cm2/V.second, particularly at least 30000 cm2/V.second) when measured via the field effect characteristics of graphene on a SiO2 substrate); or has a mobility of at least 50000 cm2/V.second (preferably at least 90000 cm2/V.second, especially at least 100000 cm2/V.second), when measured via the Hall effect. The graphene film, according to Raman spectrum, in which the ratio I(2D)/I(Gasterisk) is at least 5:1 (preferably at least 10:11, especially at least 40:1), where I(2D) is the intensity of the 2D-band and I(Gasterisk) is the intensity of the Gasterisk-band in the Raman spectrum. The advantageous properties of the graphene are among others due to the flatness and smoothness of the surface of the peeled off metal layer, which is in contact with the substrate before the peeling off step, where the flatness and smoothness of this surface is due to the fact that the metal layer is grown directly on the smooth and flat surface of the substrate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included a graphene film having a charge carrier mobility of more than 11000 cm2/V.second, when measured via the field effect characteristics of graphene on a silicon dioxide (SiO2) substrate.