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High contrast imaging and thickness determination of graphene with in-column secondary electron microscopy

Kochat, Vidya and Pal, Atindra Nath and Sneha, ES and Sampathkumar, Arjun and Gairola, Anshita and Shivashankar, SA and Raghavan, Srinivasan and Ghosh, Arindam (2011) High contrast imaging and thickness determination of graphene with in-column secondary electron microscopy. In: Journal of Applied Physics, 110 (1).

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Abstract

We report a new method for quantitative estimation of graphene layer thicknesses using high contrast imaging of graphene films on insulating substrates with a scanning electron microscope. By detecting the attenuation of secondary electrons emitted from the substrate with an in-column low-energy electron detector, we have achieved very high thickness-dependent contrast that allows quantitative estimation of thickness up to several graphene layers. The nanometer scale spatial resolution of the electron micrographs also allows a simple structural characterization scheme for graphene, which has been applied to identify faults, wrinkles, voids, and patches of multilayer growth in large-area chemical vapor deposited graphene. We have discussed the factors, such as differential surface charging and electron beam induced current, that affect the contrast of graphene images in detail. (C) 2011 American Institute of Physics. doi:10.1063/1.3608062]

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 29 Jul 2011 10:57
Last Modified: 29 Jul 2011 10:57
URI: http://eprints.iisc.ac.in/id/eprint/39609

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