Structure and Electronic Properties of Graphene Nanoislands on Co(0001)
Nano Letters2009Vol. 9(8), pp. 2844–2848
Citations Over TimeTop 1% of 2009 papers
Daejin Eom, Deborah Prezzi, Kwang Taeg Rim, Hui Zhou, Michael Lefenfeld, Shengxiong Xiao, Colin Nuckolls, Mark S. Hybertsen, Tony F. Heinz, George W. Flynn
Abstract
We have grown well-ordered graphene adlayers on the lattice-matched Co(0001) surface. Low-temperature scanning tunneling microscopy measurements demonstrate an on-top registry of the carbon atoms with respect to the Co(0001) surface. The tunneling conductance spectrum shows that the electronic structure is substantially altered from that of isolated graphene, implying a strong coupling between graphene and cobalt states. Calculations using density functional theory confirm that structures with on-top registry have the lowest energy and provide clear evidence for strong electronic coupling between the graphene pi-states and Co d-states at the interface.
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