期刊
ACS NANO
卷 9, 期 2, 页码 1325-1335出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn505178g
关键词
graphene; copper; epoxy; mechanical transfer; selective transfer; adhesion energy; traction-separation relations; rate effects
类别
资金
- National Science Foundation [CMMI-1130261, EEC-1160494]
- Institute of Basic Sciences (Republic of Korea)
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2014R1A1A1004818]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1150034] Funding Source: National Science Foundation
A very fast, dry transfer process based on Mechanical delamination successfully effected the transfer of large-area, (VD 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 mu m/s), monolayer graphene was completely transferred from the copper foil to the target silicon substrate. On the other hand, the lowest rate (25.4 mu m/s) caused the epoxy to be completely separated from the graphene. Fracture mechanics analyses were used to determine the adhesion energy between grapheiie and its seed copper foil (6.0 J/m(2)) and between graphene and the epoxy (3.4 J/m(2)) 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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