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Bottom-up Technology Toshitake Takahashi

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Bottom-up Technology. Toshitake Takahashi. A. B. C. Exfoliate. PmPV Suspension in DCE solvent. E. D. Centrifuge. Background on the synthesis of graphene sheet and graphene nanoribbon. Fabrication method so far . - Peel-off method Epitaxial growth Chemically . - PowerPoint PPT Presentation

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Page 1: Bottom-up Technology

Bottom-up Technology

Toshitake Takahashi

Page 2: Bottom-up Technology

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

AB

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

Page 3: Bottom-up Technology

Page 4: Bottom-up Technology

- 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

Page 5: Bottom-up Technology

Diameter distribution of pristine MWCNT

Width and height distribution of GNR

Diameter/Width/Height distribution

Page 6: Bottom-up Technology

16 nm-wide GNR devicemeasured in vacuum

-After electrical annealing-Symmetric electron and holetransport

7 nm-wide GNR devicemeasured in air

-p-type behavior due to Physisorbed O2

Electrical property of GNR

Page 7: Bottom-up Technology

GNR fabrication with nanowire as etching mask

Page 8: Bottom-up Technology

Electrical characteristic of GNR

-Transfer characteristic is strongly dependent on width-Opening of bandgap due to enhanced carrier confinementand edge effect as GNR width is reduced

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