National Physical Laboratory

Wrinkles show graphene is maturing

Investigation of CVD graphene topography and surface electrical properties.

Chemical Vapour Deposition (CVD) is the graphene growth process which has been shown to produce very high quality graphene (in terms of structural, electrical and mechanical properties).

CVD graphene is grown by passing carbon containing gas over heated copper, which catalyses single atomic layer growth of graphene on its surface. To be useful for a wide range of industry applications the graphene must be transferred onto other substrates to reduce cost and simplify manufacturing.

In the paper, by combining different scanning probe microscopy techniques to characterise samples of graphene, a self-supporting, single atomic layer hexagonal lattice of carbon atoms provides far more complex information than a single technique can. We combine atomic force microscopy (AFM) and scanning Kelvin probe microscopy (SKPM) to reveal several properties of the transferred film.

Wrinkles show graphene is maturing

AFM alone provides topographic information, showing 'wrinkles' where the transfer provided incomplete substrate attachment and SKPM measures the surface potential, indicating regions with different electronic properties, for example graphene layer number. By combining AFM and SKPM local defects and impurities can also be observed. Finally, Raman spectroscopy can confirm the structural properties of the graphene films, such as the number of layers and level of disorder, by observing the peaks present.

In this paper we combine all of these methods to report example data on a number of CVD samples from different sources.

This is a joint paper with Imperial College, UCL and Graphenea, and has been published in IOP Surface Topography: Metrology and Properties

For further details, please contact: Ling Hao

Last Updated: 5 Aug 2016
Created: 24 May 2016

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