Bottom-up Technology Toshitake Takahashi. Background on the synthesis of graphene sheet and graphene nanoribbon W. A. de Heer, et. al. Science 2006, 312,

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Presentation transcript:

Bottom-up Technology Toshitake Takahashi

Background on the synthesis of graphene sheet and graphene nanoribbon W. A. de Heer, et. al. Science 2006, 312, 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

- 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

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

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

GNR fabrication with nanowire as etching mask

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