Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 24, Pages 11976-11982Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp202933u
Keywords
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Funding
- National Natural Science Foundation of China [50802003, 20973006, 20973013, 51072004, 50821061, 20833001]
- Ministry of Science and Technology of China [2007CB936203, 2009CB29403, 2011CB933003]
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A facile way to segregate wafer-size graphene with controllable layer number using Cu-Ni binary alloy under vacuum annealing condition is presented here. Increasing atomic percentage of Ni in Cu-Ni alloy was found to segregate thicker uniform graphene. To date, over 95% monolayer and 91% bilayer graphene films have been prepared by only changing atomic percentage of Ni in Cu-Ni alloy, respectively. The synergetic combination of the distinct carbon solubilities of Cu and Ni and the well-known segregation phenomenon is believed to be responsible for the formation of high-quality uniform few layer graphene. Together with the easy detachment from growth substrates, we believe this facile segregation technique will offer a great driving force for graphene research.
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