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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Raman spectra of graphene exfoliated on insulating crystalline substrates

H Bukowska, F Meinerzhagen, S Akcöltekin, O Ochedowski, M Neubert, V Buck and M Schleberger1

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We have investigated single layer, bilayer and few-layer graphene exfoliated on SiO2 and on single crystal surfaces of SrTiO3, Al2O3 and TiO2 using Raman spectroscopy. The typical 'fingerprint' 2D peak turns out to be indicative of the number of graphene layers independent of the substrate material. The morphological quality of the graphene is as good as on SiO2 substrates for all the materials. We find evidence for substrate-induced changes due to doping. With most substrates, hole doping is observed, but with SrTiO3 we have identified a dielectric substrate with which electron accumulation in graphene can be achieved.


PACS

78.30.Na Fullerenes and related materials

61.72.up Other materials

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 6 (June 2011)

Received 28 January 2011

Published 9 June 2011



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