Nanoscale wear of graphene and wear protection by graphene
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In: Carbon, Vol. 120.2017, No. August, 137-144, 11.05.2017, p. 137-144.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Nanoscale wear of graphene and wear protection by graphene
AU - Vasić, Borislav
AU - Matkovic, Aleksandar
AU - Ralević, Uroš
AU - Belic, Milivoj
AU - Gajić, Radoš
PY - 2017/5/11
Y1 - 2017/5/11
N2 - Mechanical stability and wear resistivity of graphene are prerequisite for its applications in nanomechanical devices. We employ atomic force microscopy based scratching in order to explore the wear of graphene at nanoscale, and the efficiency of graphene for the wear protection of an underlying substrate. We show that the wear of graphene consists of two processes: 1. the plastic eformation for lower normal loads, followed by 2. a sudden tearing of graphene for high enough normal load, with subsequent graphene peeling off from the substrate. The complete progress of the friction during these processes is measured and explained: the friction starts from low values on plastically deformed graphene, then strongly increases for a short time during graphene tearing, and ends up at lower value on uncovered substrate after graphene peeling. Finally, we demonstrate that around 5 nm thick (over ten layers) graphene flakes provide wear protection of the underlying substrate, while thin graphene flakes, around 1 nm thick (single and bilayer), can only enhance the mechanical capacity of the underlying substrate.
AB - Mechanical stability and wear resistivity of graphene are prerequisite for its applications in nanomechanical devices. We employ atomic force microscopy based scratching in order to explore the wear of graphene at nanoscale, and the efficiency of graphene for the wear protection of an underlying substrate. We show that the wear of graphene consists of two processes: 1. the plastic eformation for lower normal loads, followed by 2. a sudden tearing of graphene for high enough normal load, with subsequent graphene peeling off from the substrate. The complete progress of the friction during these processes is measured and explained: the friction starts from low values on plastically deformed graphene, then strongly increases for a short time during graphene tearing, and ends up at lower value on uncovered substrate after graphene peeling. Finally, we demonstrate that around 5 nm thick (over ten layers) graphene flakes provide wear protection of the underlying substrate, while thin graphene flakes, around 1 nm thick (single and bilayer), can only enhance the mechanical capacity of the underlying substrate.
KW - graphene
KW - wear
KW - AFM
U2 - 10.1016/j.carbon.2017.05.036
DO - 10.1016/j.carbon.2017.05.036
M3 - Article
VL - 120.2017
SP - 137
EP - 144
JO - Carbon
JF - Carbon
SN - 0008-6223
IS - August
M1 - 137-144
ER -