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Detection of polar chemical vapors using epitaxial graphene grown on SiC (0001)

Lookup NU author(s): Dr Venkata Nagareddy, Dr Hua Khee Chan, Professor Jon Goss, Professor Nick Wright, Dr Kurt Gaskill, Dr Alton Horsfall

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Abstract

Epitaxial graphene grown on SiC (0001) showed significant changes in electrical resistance upon exposure to polar protic and polar aprotic vapors in the ambient atmosphere. The dipole moment of these chemicals was found to have a strong impact on the magnitude of the sensor response, which increases with increasing dipole moment. Using the combination of low-frequency noise and Hall measurements, we demonstrate that the chemical sensing mechanism in epitaxial graphene is based on fluctuations of the charge carrier density induced by vapor molecules adsorbed on the surface of the graphene. (C) 2013 AIP Publishing LLC.

Publication metadata

Author(s): Nagareddy VK, Chan HK, Hernandez SC, Wheeler VD, Myers-Ward RL, Nyakiti LO, Eddy CR, Walton SG, Goss JP, Wright NG, Gaskill DK, Horsfall AB

Publication type: Article

Publication status: Published

Journal: Applied Physics Letters

Year: 2013

Volume: 102

Issue: 17

Pages: 173103-1-173103-5

Online publication date: 29/04/2013

Acceptance date: 14/04/2013

ISSN (print): 0003-6951

ISSN (electronic): 1077-3118

Publisher: American Institute of Physics

URL: http://dx.doi.org/10.1063/1.4803511

DOI: 10.1063/1.4803511

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