Raman Scattering from Pt Island-Decorated Graphene

ORAL

Abstract

We performed microRaman studies of decorated $n$-Graphene Layers ($n$GLs). Nano-islands (NI; dia$\sim $5-10 nm) of Pt were created by deposition on the $n$GL with gaps between the NI in the range of few nm. When the NI were present, we observed D and D' Raman bands as well as splitting of the G-band into G$^{+}$ and G$^{-}$ (most pronounced for 1GL). The observations may be related to graphene ``confined'' in the interstitial spaces between NIs. The D and D' bands show the following properties: (1) Intensity of D and D' relative to G band decreases with increasing number of layers $n $in the $n$GL. (2) Peak frequencies, $\omega _{D}$ decreases linearly with 1/$n $while $\omega _{D\mbox{'} }$remains constant. (3) Linewidth $\Gamma _{D}$ decreases linearly with 1/$n$ , while $\Gamma _{D\mbox{'}}$ increases linearly with 1/$n$. Our results will be discussed in terms of results theoretically predicted by zone folding (Jishi \textit{et al}).

*This work was supported by the NSF NIRT ECS0609243

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Authors

  • Awnish Gupta

    • Department of Physics, The Pennsylvania State University
    • Department of Physics, Pennsylvania State University, University Park, PA 16802
    • Physics Department, Pennsylvania State University
    • Department of Physics, Pennsylvania State University
    • Department of Physics, Penn State University

  • Humberto Gutierrez

    • Department of Physics, The Pennsylvania State University
    • Physics Department, Pennsylvania State University
    • Department of Physics, Pennsylvania State University
    • Physics Department, Penn State University

  • Peter Eklund

    • Physics Department, Penn State University
    • Dept. of Physics, Penn State
    • Department of Physics, The Pennsylvania State University
    • Department of Physics, Department of Materials Science and Engeering, The Pennsylvania State University
    • Department of Physics, Department of Material Science and Engineering, Pennsylvania State University, University Park, PA 16802
    • Physics Department, Material Science \& Engineering Department
    • Department of Physics, Department of Material Sciece and Engineering, Pennsylvania State University
    • Department of Physics, Department of Materials Science \& Engineering and Materials Research Institute, Penn State University
    • Physics Department,Materials Science \& Engineering Department, Pennsylvania State University