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

High contact pressure and shear during relative movement of the sliding interfaces are known to cause structural or chemical modification or complete phase transformation due to the stress induced chemical reaction. Such reactions can manifest either formation of tribofilm or induce enhanced wear at the tribological interface. The nature of these stress-induced reactions at the atomistic level and formation of byproducts at the tribological interface, however, remain poorly understood and pose uncertainties in predicting the tribological performance of the tribosystem. In this paper we demonstrate that, when pristine molybdenum disulfide layers in their two dimensional form are coupled with nanodiamonds, the catalytic interaction of sulfur with the nanodiamond through a stress-induced tribocatalytic reaction under high pressure and shear conditions induces amorphization of nanodiamond and eventually formation of onion like carbon structures (OLCs). This leads to near-zero friction, superlubricity, when sliding against diamond like carbon (DLC) ball in dry nitrogen environment at room temperature. Furthermore, the large size (20-30 nm in diameter) and stiffness of the resulting OLCS allow sustaining high contact pressures, while graphitic lattice provides an incommensurate contact with the DLC surface, thus allowing for successful demonstration of the superlubricity conditions.
Authors:
 [1] ;  [2] ; ORCiD logo [2] ;  [2] ;  [2] ;  [2] ;  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of North Texas, Denton, TX (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1460812

Berman, Diana, Narayanan, Badri, Cherukara, Mathew J., Sankaranarayanan, Subramanian K. R. S., Erdemir, Ali, Zinovev, Alexander, and Sumant, Anirudha V.. Operando tribochemical formation of onion-like-carbon leads to macroscale superlubricity. United States: N. p., Web. doi:10.1038/s41467-018-03549-6.
Berman, Diana, Narayanan, Badri, Cherukara, Mathew J., Sankaranarayanan, Subramanian K. R. S., Erdemir, Ali, Zinovev, Alexander, & Sumant, Anirudha V.. Operando tribochemical formation of onion-like-carbon leads to macroscale superlubricity. United States. doi:10.1038/s41467-018-03549-6.
Berman, Diana, Narayanan, Badri, Cherukara, Mathew J., Sankaranarayanan, Subramanian K. R. S., Erdemir, Ali, Zinovev, Alexander, and Sumant, Anirudha V.. 2018. "Operando tribochemical formation of onion-like-carbon leads to macroscale superlubricity". United States. doi:10.1038/s41467-018-03549-6. https://www.osti.gov/servlets/purl/1460812.
@article{osti_1460812,
title = {Operando tribochemical formation of onion-like-carbon leads to macroscale superlubricity},
author = {Berman, Diana and Narayanan, Badri and Cherukara, Mathew J. and Sankaranarayanan, Subramanian K. R. S. and Erdemir, Ali and Zinovev, Alexander and Sumant, Anirudha V.},
abstractNote = {High contact pressure and shear during relative movement of the sliding interfaces are known to cause structural or chemical modification or complete phase transformation due to the stress induced chemical reaction. Such reactions can manifest either formation of tribofilm or induce enhanced wear at the tribological interface. The nature of these stress-induced reactions at the atomistic level and formation of byproducts at the tribological interface, however, remain poorly understood and pose uncertainties in predicting the tribological performance of the tribosystem. In this paper we demonstrate that, when pristine molybdenum disulfide layers in their two dimensional form are coupled with nanodiamonds, the catalytic interaction of sulfur with the nanodiamond through a stress-induced tribocatalytic reaction under high pressure and shear conditions induces amorphization of nanodiamond and eventually formation of onion like carbon structures (OLCs). This leads to near-zero friction, superlubricity, when sliding against diamond like carbon (DLC) ball in dry nitrogen environment at room temperature. Furthermore, the large size (20-30 nm in diameter) and stiffness of the resulting OLCS allow sustaining high contact pressures, while graphitic lattice provides an incommensurate contact with the DLC surface, thus allowing for successful demonstration of the superlubricity conditions.},
doi = {10.1038/s41467-018-03549-6},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {3}
}

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