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Laser cleaning of exfoliated graphene

Published online by Cambridge University Press:  20 July 2012

Oliver Ochedowski ,
Benedict Kleine Bußmann  and
Marika Schleberger
Oliver Ochedowski
Affiliation:
Fakultät für Physik and CeNIDE, Universität Duisburg-Essen, D-47048 Duisburg, Germany
Benedict Kleine Bußmann
Affiliation:
Fakultät für Physik and CeNIDE, Universität Duisburg-Essen, D-47048 Duisburg, Germany
Marika Schleberger
Affiliation:
Fakultät für Physik and CeNIDE, Universität Duisburg-Essen, D-47048 Duisburg, Germany
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Abstract

We have employed atomic force and Kelvin-Probe force microscopy to study graphene sheets exfoliated on TiO2 under the influence of local heating achieved by laser irradiation. Exfoliation and irradiation took place under ambient conditions, the measurements were performed in ultra high vacuum. We show that after irradiation times of 6 min, an increase of the surface potential is observed which indicates a decrease of p-type carrier concentration. We attribute this effect to the removal of adsorbates like water and oxygen. After irradiation times of 12 min our topography images reveal severe structural modifications of graphene. These resemble the nanocrystallite network which form on graphene/SiO2 but after much longer irradiation times. From our results we propose that short laser heating at moderate powers might offer a way to clean graphene without inducing unwanted structural modifications.

Keywords

electrical propertieslaser-induced reactionscanning probe microscopy (SPM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1455: Symposium II – Nanoscale Materials Modification by Photon, Ion, and Electron Beams , 2012 , mrss12-1455-ii08-06
Copyright
Copyright © Materials Research Society 2012

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References

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