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  • Representitive Publication
    • "Large-Scale Pattern Growth of Graphene Films for Stretchable Transparent Electrodes." Nature 457, 706 (2009) Problems associated with large-scale pattern growth of graphene constitute one of themain obstacles to using thismaterial in device applications1. Recently, macroscopic-scale graphene films were prepared by two-dimensional assembly of graphene sheets chem-ically derived from graphite crystals and graphene oxides2,3 . However, the sheet resistance of these films was found to be much larger than theoretically expected values. Here we report the direct synthesis of large-scale graphene films using chemical vapour deposition on thin nickel layers, and present two differentmethods of patterning the films and transferring them to arbitrary substrates. The transferred graphene films show very low sheet resistance of 280Vper square, with 80 per cent optical transparency......
    • "Scaling of Resistance and Electron Mean Free Path of Single-Walled Carbon Nanotubes" Phys. Rev. Lett, 98, 186808 (2007). We present an experimental investigation on the scaling of resistance in individual single walled carbon nanotube devices with channel lengths that vary four orders of magnitude on the same sample. The electron mean free path is obtained from the linear scaling of resistance with length at various temperatures. The low temperature mean free path is determined by impurity scattering, while at high temperature the mean free path decreases with increasing temperature, indicating that it is limited by electron-phonon scattering. An unusually long mean free path at room temperature has been experimentally confirmed. Exponentially increasing resistance with length at extremely long length scales suggests anomalous localization effects.