TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Szczefanowicz, Bartosz H.
A1  - Kuwahara, Takuya
A1  - Filleter, Tobin
A1  - Klemenz, Andreas
A1  - Mayrhofer, Leonhard
A1  - Bennewitz, Roland
A1  - Moseler, Michael
T1  - Formation of intermittent covalent bonds at high contact pressure limits superlow friction on epitaxial graphene
JF  - Physical Review Research
N2  - Epitaxial graphene on SiC(0001) exhibits superlow friction due to its weak out-of-plane interactions. Friction-force microscopy with silicon tips shows an abrupt increase of friction by one order of magnitude above a threshold normal force. Density-functional tight-binding simulations suggest that this wearless high-friction regime involves an intermittent sp3 rehybridization of graphene at contact pressure exceeding 10 GPa. The simultaneous formation of covalent bonds with the tip's silica surface and the underlying SiC interface layer establishes a third mechanism limiting the superlow friction on epitaxial graphene, in addition to dissipation in elastic instabilities and in wear processes.
KW  - adhesion
KW  - chemical bonding
KW  - friction
KW  - lubrication
KW  - pressure effects
Y1  - 2023
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:291:415-5740
U6  - https://doi.org/10.1103/PhysRevResearch.5.L012049
DO  - https://doi.org/10.1103/PhysRevResearch.5.L012049
VL  - 5
IS  - 1
SP  - L012049
ER  -