### Session M2: Carbon Nanostructures II

11:10 AM–12:10 PM, Saturday, October 22, 2011
UA Student Union Room: Ventana

Chair: Brian LeRoy, University of Arizona

Abstract ID: BAPS.2011.4CF.M2.4

### Abstract: M2.00004 : Scanning tunneling spectroscopy of CVD graphene

11:46 AM–11:58 AM

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#### Authors:

Daniel Cormode
(University of Arizona)

Brian LeRoy
(University of Arizona)

We investigate the electronic properties of large crystal CVD grown graphene using scanning tunneling microscopy. Mono- and bilayer crystals were prepared by transferring graphene from copper onto exfoliated boron nitride flakes on 300 nm SiO$_2$ substrates. The boron nitride provides an ultra flat surface for the graphene. Samples were measured in ultra high vacuum by scanning tunneling spectroscopy at 5 K. In these experiments, we have investigated the effect of two types of charged impurities, either random impurities from the growth process or controlled doping of the graphene with potassium atoms. Potassium atoms are controllably deposited on the graphene at low temperature by heating a getter source.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.4CF.M2.4