Abstract
One of the fundamental issues in friction is understanding the atomic details of how two materials slide against each other and start to wear. Whether this involves single-atom processes or the collective motion of atoms has been open to debate for some time. Here we report direct observations of this via in situ studies within a transmission electron microscope. We observed for both graphite and molybdenum disulfide that single atomic layers are transferred from the material to a sliding tip to form a transfer layer, and subsequent sliding takes place by sliding of single layers of graphite or molybdenum disulfide against each other. Despite the similarity of the end result, how the single layers are formed is quite different; with graphite, it involves buckling/wrinkling ~3 nm ahead of the tip, whereas with molybdenum disulfide it is via direct transfer of single sheets. Graphite is more like plastic wrap, molybdenum disulfide more like a pack of cards. This difference is attributed to the large difference in the bending modulus and strength of monolayers in the two cases. In both cases, collective processes are taking place.
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References
Dowson, D.: History of tribology. Professional Engineering Publishing, London (1998)
Bowden, F.P., Tabor, D.: The friction and lubrication of solids. Clarendon Press, Oxford (1950)
Williams, J.A.: Engineering Tribology. Oxford University Press, New York (1994)
Hutchings, I.M.: Tribology: Friction and Wear of Engineering Materials. Edward Arnold, London (1992)
Suh, N.P.: Overview of Delamination Theory of Wear. Wear 44, 1–16 (1977)
Dowson, D., Higginson, G.R.: Elasto-hydrodynamic Lubrication. Pergamon (1977)
Buscher, R., Fischer, A.: The pathways of dynamic recrystallization in all-metal hip joints. Wear 259, 887–897 (2005)
Zeng, P., Rainforth, W.M., Inkson, B.J., Stewart, T.D.: Transmission electron microscopy analysis of worn alumina hip replacement prostheses. Acta Mater. 60, 2061–2072 (2012)
Pastewka, L., Moser, S., Gumbsch, P., Moseler, M.: Anisotropic mechanical amorphization drives wear in diamond. Nat. Mater. 10, 34–38 (2011)
Gao, G.T., Mikulski, P.T., Harrison, J.A.: Molecular-scale tribology of amorphous carbon coatings: effects of film thickness, adhesion, and long-range interactions. J. Am. Chem. Soc. 124, 7202–7209 (2002)
Schall, J.D., Gao, G.T., Harrison, J.A.: Effects of Adhesion and Transfer Film Formation on the Tribology of Self-Mated DLC Contacts. J. Phys. Chem. C 114, 5321–5330 (2010)
Harrison, J.A., Schall, J.D., Knippenberg, M.T., Gao, G.T., Mikulski, P.T.: Elucidating atomic-scale friction using molecular dynamics and specialized analysis techniques. J Phys-Condens Matter 20, 354009 (2008)
Li, Q.Y., Tullis, T.E., Goldsby, D., Carpick, R.W.: Frictional ageing from interfacial bonding and the origins of rate and state friction. Nature 480, 233 (2011)
Godet, M.: The third body approach. A mechanical view of Wear. Wear 100, 437–452 (1984)
Singer, I.L., Fayeulle, S., Ehni, P.D.: Friction and wear behavior of tin in Air—the chemistry of transfer films and debris formation. Wear 149, 375–394 (1991)
Wahl, K.J., Dunn, D.N., Singer, I.L.: Wear behavior of Pb–Mo–S solid lubricating coatings. Wear 230, 175–183 (1999)
Hu, J.J., Wheeler, R., Zabinski, J.S., Shade, P.A., Shiveley, A., Voevodin, A.A.: Transmission electron microscopy analysis of Mo–W–S–Se film sliding contact obtained by using focused ion beam microscope and in situ microtribometer. Tribol. Lett. 32, 49–57 (2008)
Gane, N., Bowden, F.P.: Microdeformation of solids. J. Appl. Phys. 39, 1432 (1968)
Marks, L.D., Warren, O.L., Minor, A.M., Merkle, A.P.: Tribology in full view. Mrs Bull 33, 1168–1173 (2008)
Scharf, T.W., Prasad, S.V.: Solid lubricants: a review. J. Mater. Sci. 48, 511–531 (2013)
Gotsmann, B., Lantz, M.A.: Atomistic wear in a single asperity sliding contact. Phys Rev Lett 101, 125501 (2008)
Bhaskaran, H., Gotsmann, B., Sebastian, A., Drechsler, U., Lantz, M.A., Despont, M., Jaroenapibal, P., Carpick, R.W., Chen, Y., Sridharan, K.: Ultralow nanoscale wear through atom-by-atom attrition in silicon-containing diamond-like carbon. Nat. Nanotechnol. 5, 181–185 (2010)
Jacobs, T.D.B., Carpick, R.W.: Nanoscale wear as a stress-assisted chemical reaction. Nat. Nanotechnol. 8, 108–112 (2013)
Gnecco, E., Bennewitz, R., Meyer, E.: Abrasive wear on the atomic scale. Phys Rev Lett 88, 215501 (2002)
Novoselov, K.S., Geim, A.K., Morozov, S.V., Jiang, D., Zhang, Y., Dubonos, S.V., Grigorieva, I.V., Firsov, A.A.: Electric field effect in atomically thin carbon films. Science 306, 666–669 (2004)
Luo, J., Jang, H.D., Sun, T., Xiao, L., He, Z., Katsoulidis, A., Kanatzidis, M., Gibson, J.M., Huang, J.X.: Compression and aggregation-resistant particles of crumpled Soft sheets. ACS Nano 5, 8943–8949 (2011)
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YL and LDM acknowledge financial support by the NSF on Grant Number CMMI 1030703. This work was done under the frame work of cooperation NWU-UTSA supported by the NSF-PREM Grant Number DMR-0934218.
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Casillas, G., Liao, Y., Jose-Yacaman, M. et al. Monolayer Transfer Layers During Sliding at the Atomic Scale. Tribol Lett 59, 45 (2015). https://doi.org/10.1007/s11249-015-0563-9
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DOI: https://doi.org/10.1007/s11249-015-0563-9