Selective mechanical transfer of graphene from seed copper foil using rate effects
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- Selective mechanical transfer of graphene from seed copper foil using rate effects
- Na, Seung Ryul; Suk, Ji Won; Tao, Li; Akinwande, Deji; Ruoff, Rodney S.; Huang, Rui; Liechti, Kenneth M.
- Issue Date
- AMER CHEMICAL SOC
- ACS NANO, v.9, no.2, pp.1325 - 1335
- A very fast, dry transfer process based on mechanical delamination successfully effected the transfer of large-area, CVD grown graphene on copper foil to silicon. This has been achieved by bonding silicon backing layers to both sides of the graphene-coated copper foil with epoxy and applying a suitably high separation rate to the backing layers. At the highest separation rate considered (254.0 μm/s), monolayer graphene was completely transferred from the copper foil to the target silicon substrate. On the other hand, the lowest rate (25.4 μm/s) caused the epoxy to be completely separated from the graphene. Fracture mechanics analyses were used to determine the adhesion energy between graphene and its seed copper foil (6.0 J/m2) and between graphene and the epoxy (3.4 J/m2) at the respective loading rates. Control experiments for the epoxy/silicon interface established a rate dependent adhesion, which supports the hypothesis that the adhesion of the graphene/epoxy interface was higher than that of the graphene/copper interface at the higher separation rate, thereby providing a controllable mechanism for selective transfer of graphene in future nanofabrication systems such as roll-to-roll transfer
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