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Bottom-up Technology

This paper explores innovative techniques for synthesizing graphene sheets and nanoribbons (GNRs) suitable for large-scale applications. Methods such as the peel-off technique, epitaxial growth, and chemical processes are discussed, referencing foundational studies. The fabrication of GNRs from multi-walled carbon nanotubes (MWCNTs) is detailed, including the etching and dimensional distribution. The electrical characteristics of GNRs are examined, highlighting their p-type behavior and the impact of dimensionality on electrical performance and bandgap opening.

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Bottom-up Technology

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  1. Bottom-up Technology Toshitake Takahashi

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

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

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

  5. Electrical property of GNR 7 nm-wide GNR device measured in air • p-type behavior due to • Physisorbed O2 16 nm-wide GNR device measured in vacuum • After electrical annealing • Symmetric electron and hole • transport

  6. GNR fabrication with nanowire as etching mask

  7. 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

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