A method for obtaining flat n-graphene sheets using reverse exfoliation process V. Huc, IPCMO, Orsay...
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Transcript of A method for obtaining flat n-graphene sheets using reverse exfoliation process V. Huc, IPCMO, Orsay...
A method for obtaining flat n-graphene sheets
using reverse exfoliation process
V. Huc, IPCMO, OrsayN. Bendiab, LSP-UJF, Grenoble
T. Ebbesen, U .Pasteur, StrasbourgC. Delacour, V. Bouchiat, Institut Néel, CNRS- Grenoble
Deposited Graphene layers exhibits defects : pleats and folds
Novoselov, Geim group
lowered carrier mobility and suppression ofweak localization in graphene-based devices have beenattributed to corrugation of the graphene.
Masa Ishigami, et al. Nano Lett. ASAP paper 11-May-2007
Novoselov, Geim group
Meyer, J. C.; et al. On the roughness of single- and bi-layer graphenemembranes. Preprint archive, xxx.lanl.gov, cond-mat/0703033, 2007.
Step 1 : Bulk HOPG Bonding (upside down)
Oxidized Silicon chipFreshsly cleaved
Bulk HOPG
Epoxy glue
Epoxy glue
Reverse Exfoliation Process
Reverse Exfoliation Process
Epoxy glue
Epoxy glue
Step 1 : Bulk HOPG Bonding (upside down)
Adhesive wafer bondingF. Niklaus et al. Appl. Phys. 99, 031101 , 2006
Oxidized Silicon chip
Epoxy glue
Epoxy glue
Reverse Exfoliation Process
Bulk HOPG
Step 3 : Bulk HOPG Scalpel Cleaving
Oxidized Silicon chip
Epoxy glue
Epoxy glue
Bulk HOPG
Step 4 : Scotch™ tape exfoliation
K.S. Novoselov et al;, Science 306, 666 , (2004).
A process reminiscent from the Smart-cut ® process
Atomic scalpel
US Patent 5,882,987, published 1999
A process reminiscent from the Smart-cut ® process
Atomic scalpel
US Patent 5,882,987, published 1999
Bernin
Raman Probing The Raman spectrum of graphite is composed of a strong band at 1582 cm-1, which has been assigned to the in-plane E2g zone centre mode (G band).
Gupta et al. Nano Lett., Vol. 6, No. 12, 2006 p.2668
Raman Probing The Raman spectrum of graphite is composed of a strong band at 1582 cm-1, which has been assigned to the in-plane E2g zone centre mode (G band).
G-band clearly downshifts with increasing n
Gupta et al. Nano Lett., Vol. 6, No. 12, 2006 p.2668
Raman Probing The Raman spectrum of graphite is composed of a strong band at 1582 cm-1, which has been assigned to the in-plane E2g zone centre mode (G band).
G-band clearly downshifts with increasing n
Gupta et al. Nano Lett., Vol. 6, No. 12, p.2668 2006A. C. Ferrari, et al. Phys. Rev. Lett. 97, 187401 (2006).
Raman as a way to assess single graphene layers
Gupta et al. Nano Lett., Vol. 6, No. 12, 2006 p.2668
Raman micro-spectroscopy
MicroRaman spectra are collected using a X100 objective with a spot size of 1m using 514.5 nm excitation under ambient conditions at low laser power (<1mW).