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  • Panchal, V.National Physical Laboratory (NPL) (author)

Atmospheric doping effects in epitaxial graphene: correlation of local and global electrical studies

  • Article/chapterEnglish2016

Publisher, publication year, extent ...

  • 2016-02-01
  • IOP Publishing,2016

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:ce6dad04-7d4f-4ad9-91ab-8302be00a46f
  • https://research.chalmers.se/publication/236773URI
  • https://doi.org/10.1088/2053-1583/3/1/015006DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • We directly correlate the local (20 nm scale) and global electronic properties of a device containing mono-, bi- and tri-layer epitaxial graphene (EG) domains on 6H-SiC (0001) by simultaneously performing local surface potential measurements using Kelvin probe force microscopy and global transport measurements. Using well-controlled environmental conditions we investigate the doping effects of N-2, O-2, water vapour and NO2 at concentrations representative of the ambient air. We show that presence of O-2, water vapour and NO2 leads to p-doping of all EG domains. However, the thicker layers of EG are significantly less affected. Furthermore, we demonstrate that the general consensus of O-2 and water vapour present in ambient air providing majority of the p-doping to graphene is a common misconception. We experimentally show that even the combined effect of O-2, water vapour, and NO2 at concentrations higher than typically present in the atmosphere does not fully replicate p-doping from ambient air. Thus, for EG gas sensors it is essential to consider naturally occurring environmental effects and properly separate them from those coming from targeted species.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Giusca, C. E.National Physical Laboratory (NPL) (author)
  • Lartsev, Arseniy,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)arseniy (author)
  • Martin, N. A.National Physical Laboratory (NPL) (author)
  • Cassidy, N.University of Surrey,National Physical Laboratory (NPL) (author)
  • Myers-Ward, R. L.Naval Research Laboratory (author)
  • Gaskill, D. K.Naval Research Laboratory (author)
  • Kazakova, O.National Physical Laboratory (NPL) (author)
  • National Physical Laboratory (NPL)Chalmers tekniska högskola (creator_code:org_t)

Related titles

  • In:2D Materials: IOP Publishing3:12053-1583

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