Operando tribochemical formation of onion-like-carbon leads to macroscale superlubricity

Diana Berman, Badri Narayanan, Mathew J. Cherukara, Subramanian K. R. S. Sankaranarayanan, Ali Erdemir, Alexander Zinovev and Anirudha V. Sumant ()
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Diana Berman: Argonne National Laboratory
Badri Narayanan: Argonne National Laboratory
Mathew J. Cherukara: Argonne National Laboratory
Subramanian K. R. S. Sankaranarayanan: Argonne National Laboratory
Ali Erdemir: Argonne National Laboratory
Alexander Zinovev: Argonne National Laboratory
Anirudha V. Sumant: Argonne National Laboratory

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Stress-induced reactions at the sliding interface during relative movement are known to cause structural or chemical modifications in contacting materials. The nature of these modifications at the atomic level and formation of byproducts in an oil-free environment, however, remain poorly understood and pose uncertainties in predicting the tribological performance of the complete tribosystem. Here, we demonstrate that tribochemical reactions occur even in dry conditions when hydrogenated diamond-like carbon (H-DLC) surface is slid against two-dimensional (2D) molybdenum disulfide along with nanodiamonds in dry nitrogen atmosphere. Detailed experimental studies coupled with reactive molecular dynamics simulations reveal that at high contact pressures, diffusion of sulfur from the dissociated molybdenum disulfide led to amorphization of nanodiamond and subsequent transformation to onion-like carbon structures (OLCs). The in situ formation of OLCs at the sliding interface provide reduced contact area as well as incommensurate contact with respect to the H-DLC surface, thus enabling successful demonstration of superlubricity

Date: 2018
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DOI: 10.1038/s41467-018-03549-6

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