Band-gap tuning of monolayer graphene by oxygen adsorption
2014
Abstract We have performed high-resolution angle-resolved photoemission spectroscopy of oxygen-adsorbed monolayer graphene grown on 6H–SiC(0 0 0 1). We found that the energy gap between the π and π ∗ bands gradually increases with oxygen adsorption to as high as 0.45 eV at the 2000 L oxygen exposure. A systematic shrinkage of the π ∗ electron Fermi surface was also observed. The present result strongly suggests that the oxidization is a useful technique to create and control the band gap in monolayer graphene.
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