Raman Maps of Carbon Nanoscrolls and their Bundles

Recent theoretical simulations and experimental data have shown that carbon nanoscrolls, formed by rolling a single layer of graphene, exhibit different electronic and optical properties from carbon nanotubes or the planar graphene sheet. They hold promise in a variety of applications areas such as energy storage and nanomechanics. Here, we present our investigation on the formation of carbon nanoscrolls and their bundles from large-area graphene originally grown on copper foil by chemical vapor deposition. When graphene is transferred from a copper foil onto a silicon wafer using wet chemistry, both filled and unfilled carbon nanoscrolls are produced upon the rupture of graphene. These nanoscrolls can further form bundles. The results from Raman mapping, optical microscopy, scanning electron microscopy, and atomic force microscopy measurements will be presented and the formation mechanism will be discussed.