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    Lubricating graphene with a nanometer-thick perfluoropolyether

    Year: 2013

    Journal: THIN SOLID FILMS, Vol. 549, p 299-305, 20150703

    Authors: Kozbial, Andrew; Li, Zhiting; Iasella, Steven; Taylor, Alexander T.; Morganstein, Brittni; Wang, Yongjin; Sun, Jianing; Zhou, Bo; Randall, Nicholas X.; Liu, Haitao; Li, Lei

    Organizations: Univ Pittsburgh, Swanson Sch Engn, Dept Chem & Petr Engn, Pittsburgh, PA 15261 USA; Univ Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA; Univ Pittsburgh, Swanson Sch Engn, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA; JA Woollam Co Inc, Lincoln, NE 68508 USA; CSM Instruments, Needham, MA 02494 USA

    Due to its atomic thickness (thinness), the wear of graphene in nanoscale devices or as a protective coating is a serious concern. It is highly desirable to develop effective methods to reduce the wear of graphene. In the current paper, the effect of a nano-lubricant, perfluoropolyether, on the wear of graphene on different substrates is investigated. Graphene was synthesized by chemical vapor deposition (CVD) and characterized by Raman spectroscopy. The nano-lubricant is applied on the graphene by dip-coating. The friction and wear of graphene samples are characterized by nanotribometer, AFM, optical microscopy and Raman spectroscopy. The results showed that lubricating silicon/graphene with nano-lubricant reduces the friction but increases the wear. However, lubricating nickel/graphene with nano-lubricant has little effect on the friction but reduce the wear significantly. The underlying mechanism has been discussed on the basis of the graphene-substrate adhesion and the roughness. The current study provides guidance to the future design of graphene-containing devices. (C) 2013 Elsevier B.V. All rights reserved.