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The Role of Contact Adhesion in Friction and Wear of Graphene under Sliding Conditions

Published online by Cambridge University Press:  28 February 2013

Emil J. Sandoz-Rosado  and
Elon J. Terrell
Emil J. Sandoz-Rosado
Affiliation:
Department of Mechanical Engineering, Columbia University, 500 West 120th St Room 220, New York, NY 10027.
Elon J. Terrell*
Affiliation:
Department of Mechanical Engineering, Columbia University, 500 West 120th St Room 220, New York, NY 10027.
*
*Corresponding author email: eterrell@columbia.edu
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Abstract

In this study, the failure mechanisms of graphene under sliding are examined using atomistic simulations. A 6nm diameter diamond tip is slid (at a controlled normal load) over a graphene monolayer that is adhered to a semi-infinite silicon substrate. The impact of tip adhesion on the wear and frictional behavior of graphene is studied by comparing two diamond tips, one of which has been hydrogen-passivated and the other which is bare carbon. By contrasting the passivated and unpassivated tips, the interplay of adhesive and abrasive wear on the graphene membrane can also be compared. The results of this work indicate that chemical bonding between the tip and the graphene greatly exacerbates tearing in the graphene monolayer by plowing ahead of the indenter, causing material build-up and increasing effective contact area.

Keywords

adhesionnanoscaleC
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1505: Symposium W – Carbon Nanomaterials , 2013 , mrsf12-1505-w22-02
Copyright
Copyright © Materials Research Society 2013

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References

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