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Sci. Lett. J. 2015, 4: 199
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Research Article
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Full Text
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Formation and interaction of self-assembled pentacene structures on monolayer graphene
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Rui Hea, Fabio Cartab, M. Ashana, K. Baderc, E. Maldonadoa, Conor Delaneya, Tim Kidda, Benjamin Becka, Chris Reillya, Ioannis Kymissisb, Aron Pinczukd,e, Michael Rotha,f
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a Department of Physics, University of Northern Iowa, Cedar Falls, Iowa 50614, USA
b Department of Electrical Engineering, Columbia University, New York, New York 10027, USA
c Department of Physics and Astronomy, UC - Riverside, Riverside, California 92521, USA
d Department of Physics, Columbia University, New York, New York 10027, USA
e Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York, 10027, USA
f Department of Physics, Geology, and Engineering Technology, Northern Kentucky University, Highland Heights, Kentucky 41099, USA
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Abstract |
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Pentacene with nominal thickness of one monolayer was thermally evaporated on monolayer graphene grown by chemical vapor deposition on Cu foil and transferred onto SiO2 substrate. We found that the growth of pentacene on graphene is highly nonuniform with the formation of pentacene clusters. The 2D Raman peak of graphene displays a blueshift after the evaporation of pentacene, which suggests that the graphene layer is subject to a compressive strain after pentacene deposition. The compressive strain is nonuniform, as evidenced by the broadened distribution of the 2D peak frequency after evaporation of pentacene. Molecular Dynamics (MD) simulations confirm that the adsorbed pentacene layer is highly nonuniform with richly varying structures. The molecules closest to the graphene are flat but are rolled and tilted considerably when farther away. The simulations also help elucidate bulk dynamical and strain effects on the graphene, revealing compressive strain on the order of 0.2% for small isolated clusters that lie flat on the graphene surface.
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Keywords
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Pentacene; Graphene; Self-assemble; Molecular dynamics
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