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}).

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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