AVS 58th Annual International Symposium and Exhibition
    Graphene and Related Materials Focus Topic Tuesday Sessions
       Session GR-TuA

Paper GR-TuA2
A Scanning Tunneling Microscopy and Spectroscopy Study of Artificially Modified Bilayer Graphene

Tuesday, November 1, 2011, 2:20 pm, Room 209

Session: Graphene on Dielectrics, Graphene Transfer to Novel Substrates
Presenter: Hongwoo Baek, Seoul National University, Republic of Korea
Authors: H. Baek, Seoul National University, Republic of Korea
J. Ha, Seoul National University, Republic of Korea
B. Hwang, Seoul National University, Republic of Korea
J. Kwon, Seoul National University, Republic of Korea
J.A. Stroscio, National Institute of Standards and Technology
Y. Kuk, Seoul National University, Republic of Korea
Correspondent: Click to Email
Bilayer graphene has drawn considerable attention due to deviation from Dirac Fermion picture such as anomalous quantum hall effect and a tunable band gap in their spectrum. While a pristine Bernal (AB) stacked bilayer graphene can be synthesized by mechanical exfoliation, growth on a SiC single crystal and epitaxial growth on metal substrates, separate control of the top and the bottom layers has seldom been performed. In this study, artificially modified 2D layers were demonstrated with individually stacked bilayer graphene. Large-area graphene was grown on a Cu foil by chemical vapor deposition (CVD). CVD-grown graphene layers were transferred successively onto insulating substrates with minimum chemical process for realizing bilayer graphene. In this method the mosaic spread between the top and the bottom graphene layers could be varied and an additional thin layer structure could be inserted between the two layers. Artificial bilayer graphene was investigated using scanning tunneling microscopy and spectroscopy. In topographic images and spatially resolved spectrums of local density of states, defect scattering and the misorientation between two graphene layers suggesting weak interaction compared to the AB stacking were found.