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Nanoscale tribology of graphene grown by chemical vapor deposition and transferred onto silicon oxide substrates

Published online by Cambridge University Press:  01 February 2016

Tuna Demirbaş  and
Mehmet Z. Baykara
Tuna Demirbaş
Affiliation:
Department of Mechanical Engineering and UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
Mehmet Z. Baykara*
Affiliation:
Department of Mechanical Engineering and UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We present a comprehensive nanoscale tribological characterization of single-layer graphene grown by chemical vapor deposition (CVD) and transferred onto silicon oxide (SiO2) substrates. Specifically, the nanotribological properties of graphene samples are studied via atomic force microscopy (AFM) under ambient conditions using calibrated probes, by measuring the evolution of friction force with increasing normal load. The effect of using different probes and post-transfer cleaning procedures on frictional behavior is evaluated. A new method of quantifying lubrication performance based on measured friction coefficient ratios of graphene and SiO2 is introduced. A comparison of lubrication properties with mechanically-exfoliated graphene is performed. Results indicate that CVD-grown graphene constitutes a very good solid lubricant on SiO2, reducing friction coefficients by ∼90% for all investigated samples. Finally, the effect of wrinkles associated with CVD-grown graphene on measured friction values is quantitatively analyzed, with results revealing a substantial increase in friction on these structural defects.

Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 13: Focus Issue: Advances and Challenges in Carbon-based Tribomaterials , 14 July 2016 , pp. 1914 - 1923
Copyright
Copyright © Materials Research Society 2016 

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References

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