Non-fold non-polymer graphene wet transfer method

Abstract

The invention discloses a non-fold non-polymer graphene wet transfer method. The method comprises the following steps: cleaning and blow-drying copper foil with graphene grown on the copper foil; preparing a corrosion solution with a certain concentration, wherein an anti-crease agent is contained in the corrosion solution; adding heptane to the corrosion solution to obtain a heptane-anti-crease agent, and dropwise adding the heptane-anti-crease agent on the graphene-copper foil; floating the graphene-copper foil with a heptane layer on the liquid surface of the corrosion solution, wherein thecopper foil and the corrosion solution are positioned on the liquid surface, and the graphene is positioned on the copper foil; adding the heptane-anti-crease agent on the graphene-copper foil on thecorrosion solution; waiting for the copper foil to dissolve completely, and horizontally placing the oxide layer of a substrate on the graphene; slowly pressing the substrate onto the graphene untilthe graphene fully contacts the substrate, so that the graphene is attached to the substrate to form a graphene-substrate; cleaning the obtained graphene-substrate; and carrying out drying to obtain the clean graphene-substrate. With the method provided by the invention, breakage caused by the self-fold of the graphene is avoided when the graphene is transferred.

Description

technical field [0001] The invention relates to a graphene wet transfer method. Background technique [0002] Graphene, a new type of two-dimensional thin-film carbon material, has rapidly set off a wave of graphene research in the world because of its excellent properties beyond many materials. So far, the preparation methods of graphene and the research on its mechanical, electrical, chemical and other aspects have made very good progress. However, if graphene is to be applied to other devices, it is necessary to use the CVD method to grow large-scale continuous graphene films, but the graphene grown by the CVD method cannot be used directly on the copper substrate, so a corresponding transfer method is required to transfer the graphene onto the target substrate. [0003] Graphene film has excellent mechanical properties. If graphene grows sufficiently and completely, then theoretically there is no need to use a polymer such as PMMA as a protective layer. Graphene can al...

AI Technical Summary

Problems solved by technology

This method can indeed obtain a clean graphene film, but the integrity of the graphene is difficult to guarantee, mainly because the copper foil corrosion process first forms a series of holes along the copper foil boundary, and finally with the expansion of the hole, the copper foil Gradually corroded, this corrosion process will cause the relative movement of the unconnected parts of the copper foil due to the release of the surface tension of the solution and its own residual stress, thereby tearing the graphene, and the graphene will bend and fold in order to maintain the lowest energy state, finally crumpled together

Therefore, the repeatability of the experiment is poor, the accuracy requirements are high, and the environmental adaptability is poor. A slight disturbance will destroy the graphene film, and it cannot be used as a universal transfer method.

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