▎ 摘　　要

NOVELTY - Transferring a graphene film to a substrate comprises e.g. (i) providing a graphene film grown on a support, (ii) positioning the supported graphene film at the interface of a biphasic mixture, where the biphasic mixture comprises an aqueous phase and an organic phase, the phases are immiscible, and the aqueous phase further comprises an etchant which completely etches the graphene support from the graphene film, and (iii) after etching has taken place, cooling the biphasic mixture to a temperature so that the organic phase solidifies but the aqueous phase remains a liquid. USE - The method is useful for transferring a graphene film to a substrate, where the graphene film substrate is useful in an in-situ sensing application (all claimed). ADVANTAGE - The method provides the graphene film substrate which has uniform structure and high quality, and is a polymer-free method. DETAILED DESCRIPTION - Transferring a graphene film to a substrate comprises either: (i) providing a graphene film grown on a support, (ii) positioning the supported graphene film at the interface of a biphasic mixture, where the biphasic mixture comprises an aqueous phase and an organic phase, the phases are immiscible, and the aqueous phase further comprises an etchant which completely etches the graphene support from the graphene film, (iii) after etching has taken place, cooling the biphasic mixture to a temperature so that the organic phase solidifies but the aqueous phase remains a liquid, where the graphene film sticks to the solidified organic phase, (iv) separating the solidified organic phase from the aqueous phase, (v) applying the graphene of the solidified phase to a substrate, and (vi) removing the solidified organic phase by melting, subliming or evaporating the organic phase; or (i-1) providing a graphene film grown on a support and placing it on a substrate, (ii-2) positioning the supported graphene film substrate at the interface of a biphasic mixture, where the biphasic mixture comprises an aqueous phase and an organic phase, the phases are immiscible, and the aqueous phase further comprises an etchant which completely etches the graphene support from the graphene film, (iii-3) after etching has taken place, cooling the biphasic mixture to a temperature so that the organic phase solidifies but the aqueous phase remains a liquid, where the graphene film sticks to the solidified organic phase, and (iv-4) removing the solidified organic phase by melting, subliming or evaporating the organic phase. An INDEPENDENT CLAIM is also included for a graphene film substrate obtainable by the method.