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Title: Impact of Microstructure on MoS 2 Oxidation and Friction

Abstract

In this work, we demonstrate the role of microstructure in the friction and oxidation behavior of the lamellar solid lubricant molybdenum disulfide (MoS 2). We report on systematic investigations of oxidation and friction for two MoS 2 films with distinctively different microstructures—amorphous and planar/highly-ordered—before and after exposure to atomic oxygen (AO) and high-temperature (250 °C) molecular oxygen. A combination of experimental tribology, molecular dynamics simulations, X-ray photoelectron spectroscopy (XPS), and high-sensitivity low-energy ion scattering (HS-LEIS) was used to reveal new insights about the links between structure and properties of these widely utilized low-friction materials. Initially, ordered MoS 2 films showed a surprising resistance to both atomic and molecular oxygens (even at elevated temperature), retaining characteristic low friction after exposure to extreme oxidative environments. Finally, XPS shows comparable oxidation of both coatings via AO; however, monolayer resolved compositional depth profiles from HS-LEIS reveal that the microstructure of the ordered coatings limits oxidation to the first atomic layer.

Authors:
 [1];  [2];  [3];  [4];  [2];  [2];  [5]; ORCiD logo [5]
  1. Lehigh Univ., Bethlehem, PA (United States). Department of Mechanical Engineering and Mechanics; Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Materials Science and Engineering Center
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Materials Science and Engineering Center
  3. Lehigh Univ., Bethlehem, PA (United States). Surface Analysis Facility
  4. Lehigh Univ., Bethlehem, PA (United States). Materials Science & Engineering Department
  5. Lehigh Univ., Bethlehem, PA (United States). Department of Mechanical Engineering and Mechanics
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1429653
Report Number(s):
SAND-2017-11202J
Journal ID: ISSN 1944-8244; 657854
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 9; Journal Issue: 33; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; aging; friction; HS-LEIS; MoS2; nitrogen spray; orientation; oxidation; wear

Citation Formats

Curry, John F., Wilson, Mark A., Luftman, Henry S., Strandwitz, Nicholas C., Argibay, Nicolas, Chandross, Michael, Sidebottom, Mark A., and Krick, Brandon A. Impact of Microstructure on MoS2 Oxidation and Friction. United States: N. p., 2017. Web. doi:10.1021/acsami.7b06917.
Curry, John F., Wilson, Mark A., Luftman, Henry S., Strandwitz, Nicholas C., Argibay, Nicolas, Chandross, Michael, Sidebottom, Mark A., & Krick, Brandon A. Impact of Microstructure on MoS2 Oxidation and Friction. United States. doi:10.1021/acsami.7b06917.
Curry, John F., Wilson, Mark A., Luftman, Henry S., Strandwitz, Nicholas C., Argibay, Nicolas, Chandross, Michael, Sidebottom, Mark A., and Krick, Brandon A. Mon . "Impact of Microstructure on MoS2 Oxidation and Friction". United States. doi:10.1021/acsami.7b06917. https://www.osti.gov/servlets/purl/1429653.
@article{osti_1429653,
title = {Impact of Microstructure on MoS2 Oxidation and Friction},
author = {Curry, John F. and Wilson, Mark A. and Luftman, Henry S. and Strandwitz, Nicholas C. and Argibay, Nicolas and Chandross, Michael and Sidebottom, Mark A. and Krick, Brandon A.},
abstractNote = {In this work, we demonstrate the role of microstructure in the friction and oxidation behavior of the lamellar solid lubricant molybdenum disulfide (MoS2). We report on systematic investigations of oxidation and friction for two MoS2 films with distinctively different microstructures—amorphous and planar/highly-ordered—before and after exposure to atomic oxygen (AO) and high-temperature (250 °C) molecular oxygen. A combination of experimental tribology, molecular dynamics simulations, X-ray photoelectron spectroscopy (XPS), and high-sensitivity low-energy ion scattering (HS-LEIS) was used to reveal new insights about the links between structure and properties of these widely utilized low-friction materials. Initially, ordered MoS2 films showed a surprising resistance to both atomic and molecular oxygens (even at elevated temperature), retaining characteristic low friction after exposure to extreme oxidative environments. Finally, XPS shows comparable oxidation of both coatings via AO; however, monolayer resolved compositional depth profiles from HS-LEIS reveal that the microstructure of the ordered coatings limits oxidation to the first atomic layer.},
doi = {10.1021/acsami.7b06917},
journal = {ACS Applied Materials and Interfaces},
issn = {1944-8244},
number = 33,
volume = 9,
place = {United States},
year = {2017},
month = {7}
}

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Cited by: 2 works
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