1. Bottom-up Technology Toshitake Takahashi

2. Background on the synthesis of graphene sheet and graphene nanoribbon W. A. de Heer, et. al. Science 2006, 312, 1191. - Peel-off method - Epitaxial growth - Chemically A B PmPV Suspension in DCE solvent C Centrifuge D E Exfoliate Li, X. L. et al. Science 319, 1229–1232 (2008) K. S. Novoselov, et al. Science 2004, 306, 666. Fabrication method so far Required new approach for Large scale application

4. - PMMA- MWCNT film was peeled off in KOH solution -Top side wall of MWCNT were etched faster and removed by plasma Making GNR from MWCNT

5. Diameter distribution of pristine MWCNT Width and height distribution of GNR Diameter/Width/Height distribution

6. 16 nm-wide GNR device measured in vacuum -After electrical annealing -Symmetric electron and hole transport 7 nm-wide GNR device measured in air -p-type behavior due to Physisorbed O 2 Electrical property of GNR

7. GNR fabrication with nanowire as etching mask

8. Electrical characteristic of GNR -Transfer characteristic is strongly dependent on width -Opening of bandgap due to enhanced carrier confinement and edge effect as GNR width is reduced