Using a chemical process to delaminate graphene from HOPG, we are able to produce suspended graphene and n-graphene layer films (i.e., $n$GL\textbf{, }n=integer) in various organic solvents. The $n$GLs have lateral dimensions of several microns. We observe that in a matter of a few hours, the $n$GLs ``roll up'' on themselves to form scrolls. Here we present results of a study which investigates the role of the solvent in determining the characteristic time to ``roll up'' the $n$GL. Raman scattering, AFM and TEM is used to characterize the scrolls. A model will be presented to explain why the scrolling occurs.
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Authors
Humberto Guti\'errez
Department of Physics, Pennsylvania State University
Department of Physics, Pennsylvania State University, University Park, PA 16802, U.S.A
Awnish Gupta
Department of Physics, Pennsylvania State University
Qiujie Lu
Department of Physics, The Pennsylvania State University
Department of Physics, Pennsylvania State University
Vincent H. Crespi
The Penn State University
The Pennsylvania State University
Department of Physics, Pennsylvania State University
Penn State University
Department of Physics, Penn State University
Peter Eklund
Department of Physics, Department of Material Sciences, Materials Research Institute, The Pennsylvania State University
Department of Physics, Pennsylvania State University
Department of Physics, Pennsylvania State University, University Park, PA 16802, U.S.A
