Adjusting the electronic properties and gas reactivity of epitaxial graphene by thin surface metallization

Graphene-based chemical gas sensors normally show ultra-high sensitivity to certain gas molecules but at the same time suffer from poor selectivity and slow response and recovery times. Several approaches based on functionalization or modification of the graphene surface have been demonstrated as me...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2014-04, Vol.439, p.105-108
Main Authors: Eriksson, Jens, Puglisi, Donatella, Kang, Yu Hsuan, Yakimova, Rositza, Lloyd Spetz, Anita
Format: Article
Language:English
Subjects:
Condensed matter
Deposition
Electronic properties
Epitaxial graphene on SiC
Gas sensor
Graphene
Metallizing
Reproducibility
Selectivity
Surface chemistry
Surface modifications
TECHNOLOGY
TEKNIKVETENSKAP
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Summary:Graphene-based chemical gas sensors normally show ultra-high sensitivity to certain gas molecules but at the same time suffer from poor selectivity and slow response and recovery times. Several approaches based on functionalization or modification of the graphene surface have been demonstrated as means to improve these issues, but most such measures result in poor reproducibility. In this study we investigate reproducible graphene surface modifications by sputter deposition of thin nanostructured Au or Pt layers. It is demonstrated that under the right metallization conditions the electronic properties of the surface remain those of graphene, while the surface chemistry is modified to improve sensitivity, selectivity and speed of response to nitrogen dioxide.
ISSN:0921-4526
1873-2135
1873-2135
DOI:10.1016/j.physb.2013.11.009