Aurum-Mesh Transfer of Large-Scale Monolayer Graphene Patterns
When graphene prepared by chemical vapor deposition(CVD)method is applied to various high-performance devices,graphene's transfer and patterning process usually reduces its intrinsic properties.A new method combining wet transfer and mechanical exfoliation can be utilized to accomplish high-quality and large-scale transfer of graphene patterns.This method requires the preparation of an aurum(Au)-mesh with pores of a specific form as the peeling belt.The contact area between the Au and graphene can offer sufficient adhesion to the homogeneous monolayer graphene for mechanical exfoliation,whereas the non-contact area between the hole and graphene has a relatively weak force to release the graphene patterns on the substrate.The surface morphology and electrical characterization of graphene show that the graphene surface is clean and uniform,while graphene field-effect transistors have high carrier mobility and small Dirac voltage.The Au-mesh transfer method can effectively improve the quality of the graphene patterns as well as the efficiency of the transfer,which opens up a broader scope for the application of CVD graphene and also provides a reference for the transfer of other CVD two-dimensional(2D)materials.
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