Abstract
The innovative design of sliding transfer based on a liquid substrate can succinctly transfer high-quality, wafer-size, and contamination-free graphene within a few seconds. Moreover, it can be extended to transfer other 2D materials. The efficient sliding transfer approach can obtain high-quality and large-area graphene for fundamental research and industrial applications.
Highlights
The successful isolation of high-quality single-layer or few-layer graphene by mechanical exfoliation has unleashed a flurry of research activities in 2D carbon worldwide over the past few years.[1,2,3,4,5] The ease of production and low cost make exfoliation of graphite the most popular route to prepare graphene whenever and wherever possible.[6,7,8] this generally involves using either an adhesive tape to attach to the surface of graphite and using force to vertically peel off the tape plus graphene layers attached[1,7,8] or by rubbing the surface of graphite against another material to slide off graphene sheets from the bulk.[6,9] this technique fails to provide sufficient output yield, large size and layer-number homogeneity for many applications owing to multiple cleavage planes and strong interlayer van der Waals interactions in the normal direction.[8]
Given a unique original substrate (OS) and an appropriate target substrate (TS), when the OS which bears graphene parallelly “crawls” on the TS, the graphene will closely adhere to the TS due to the easy separation of the OS and the lateral push force resulted from the horizontal movement
This can be explained by the different strain introduced from the sliding process and the uniform G peak shifts over a large area confirms the gentle and uniform applied force of the sliding technique which has no damage to the transferred graphene
Summary
The successful isolation of high-quality single-layer or few-layer graphene by mechanical exfoliation has unleashed a flurry of research activities in 2D carbon worldwide over the past few years.[1,2,3,4,5] The ease of production and low cost make exfoliation of graphite the most popular route to prepare graphene whenever and wherever possible.[6,7,8] this generally involves using either an adhesive tape to attach to the surface of graphite and using force to vertically peel off the tape plus graphene layers attached[1,7,8] or by rubbing the surface of graphite against another material to slide off graphene sheets from the bulk.[6,9] this technique fails to provide sufficient output yield, large size and layer-number homogeneity for many applications owing to multiple cleavage planes and strong interlayer van der Waals interactions in the normal direction.[8].
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