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Dual control on nanofriction of graphene

Abstract

Tunable nanofriction of graphene as a lubricant material are important for the application in the micro/nano-electromechanical devices. The tunable nanofriction array of graphene on silicon dioxide /silicon (SiO2/Si) substrate was achieved by functionalization using negative-bias conductive atomic force microscopy through introducing the electron releasing process to avoid the electron saturation. Based on the electron releasing process, the functionalization degree of graphene, and thus the nanofriction, was controllably tuned by tip voltage. Moreover, the nanofriction of functionalized array were further enhanced by applying biased tip voltage. The value of the nanofriction on functionalized array increased with the increase of bias voltage because polarization induced electrostatic force and the voltage increased meniscus force. The tuning of nanofriction of functionalized graphene on insulating substrate could provide the clue to the electric-carrying friction behavior of graphene as solid lubricant in micro/nano-electromechanical systems (MEMS/NEMS) and the fabrication of nanodevice with pattern surface.Tunable nanofriction of graphene as a lubricant material are important for the application in the micro/nano-electromechanical devices. The tunable nanofriction array of graphene on silicon dioxide /silicon (SiO2/Si) substrate was achieved by functionalization using negative-bias conductive atomic force microscopy through introducing the electron releasing process to avoid the electron saturation. Based on the electron releasing process, the functionalization degree of graphene, and thus the nanofriction, was controllably tuned by tip voltage. Moreover, the nanofriction of functionalized array were further enhanced by applying biased tip voltage. The value of the nanofriction on functionalized array increased with the increase of bias voltage because polarization induced electrostatic force and the voltage increased meniscus force. The tuning of nanofriction of functionalized graphene on insulating substrate could provide the clue to the electric-carrying friction behavior of graphene as solid lubricant in micro/nano-electromechanical systems (MEMS/NEMS) and the fabrication of nanodevice with pattern surface.

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Publication details

The article was received on 28 Feb 2019, accepted on 08 Apr 2019 and first published on 08 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC01148J
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript

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    Dual control on nanofriction of graphene

    H. Lang, Y. peng, G. Shao, K. zou and G. Tao, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC01148J

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