High-Sensitivity Low-Energy Ion Spectroscopy with Sub-Nanometer Depth Resolution Reveals Oxidation Resistance of MoS(2) Increases with Film Density and Shear-Induced Nanostructural Modifications of the Surface

[Image: see text] For decades, density has been attributed as a critical aspect of the structure of sputter-deposited nanocrystalline molybdenum disulfide (MoS(2)) coatings impacting oxidation resistance and wear resistance. Despite its importance, there are few examples in the literature that expli...

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Autores principales: Babuska, Tomas F., Curry, John F., Thorpe, Ryan, Chowdhury, Md. Istiaque, Strandwitz, Nicholas C., Krick, Brandon A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9887728/
https://www.ncbi.nlm.nih.gov/pubmed/36743857
http://dx.doi.org/10.1021/acsanm.2c04703
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author Babuska, Tomas F.
Curry, John F.
Thorpe, Ryan
Chowdhury, Md. Istiaque
Strandwitz, Nicholas C.
Krick, Brandon A.
author_facet Babuska, Tomas F.
Curry, John F.
Thorpe, Ryan
Chowdhury, Md. Istiaque
Strandwitz, Nicholas C.
Krick, Brandon A.
author_sort Babuska, Tomas F.
collection PubMed
description [Image: see text] For decades, density has been attributed as a critical aspect of the structure of sputter-deposited nanocrystalline molybdenum disulfide (MoS(2)) coatings impacting oxidation resistance and wear resistance. Despite its importance, there are few examples in the literature that explicitly investigate the relationship between the density and oxidation behaviors of MoS(2) coatings. Aging and oxidation are primary considerations for the use of MoS(2) coatings in aerospace applications as they inevitably experience prolonged storage in water and oxygen-rich environments prior to use. Oxidation that is either limited to the first few nanometers or through the bulk of the coating can result in seizure due to high initial coefficients of friction or component failure from excessive wear. High-sensitivity low-energy ion spectroscopy (HS-LEIS) and Rutherford backscattering spectrometry (RBS) are both used to understand the extent of oxidation throughout the first ∼10 nanometers of the surface of pure sputtered nanocrystalline MoS(2) coatings after high-temperature aging and how it is impacted by the density of coatings as measured by RBS. Results show that low-density coatings (ρ = 3.55 g/cm(3)) exhibit a more columnar microstructure and voiding, which act as pathways for oxidative species to penetrate and interact with edge sites, causing severe surface and subsurface oxidation. Furthermore, HS-LEIS of surfaces sheared prior to oxidation reveals that the oxidation resistance of low-density MoS(2) coatings can be significantly improved by shear-induced reorientation of the surface microstructure to a basal orientation and elimination of pathways for oxygen into the bulk through compaction of surface and subsurface voids.
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spelling pubmed-98877282023-02-01 High-Sensitivity Low-Energy Ion Spectroscopy with Sub-Nanometer Depth Resolution Reveals Oxidation Resistance of MoS(2) Increases with Film Density and Shear-Induced Nanostructural Modifications of the Surface Babuska, Tomas F. Curry, John F. Thorpe, Ryan Chowdhury, Md. Istiaque Strandwitz, Nicholas C. Krick, Brandon A. ACS Appl Nano Mater [Image: see text] For decades, density has been attributed as a critical aspect of the structure of sputter-deposited nanocrystalline molybdenum disulfide (MoS(2)) coatings impacting oxidation resistance and wear resistance. Despite its importance, there are few examples in the literature that explicitly investigate the relationship between the density and oxidation behaviors of MoS(2) coatings. Aging and oxidation are primary considerations for the use of MoS(2) coatings in aerospace applications as they inevitably experience prolonged storage in water and oxygen-rich environments prior to use. Oxidation that is either limited to the first few nanometers or through the bulk of the coating can result in seizure due to high initial coefficients of friction or component failure from excessive wear. High-sensitivity low-energy ion spectroscopy (HS-LEIS) and Rutherford backscattering spectrometry (RBS) are both used to understand the extent of oxidation throughout the first ∼10 nanometers of the surface of pure sputtered nanocrystalline MoS(2) coatings after high-temperature aging and how it is impacted by the density of coatings as measured by RBS. Results show that low-density coatings (ρ = 3.55 g/cm(3)) exhibit a more columnar microstructure and voiding, which act as pathways for oxidative species to penetrate and interact with edge sites, causing severe surface and subsurface oxidation. Furthermore, HS-LEIS of surfaces sheared prior to oxidation reveals that the oxidation resistance of low-density MoS(2) coatings can be significantly improved by shear-induced reorientation of the surface microstructure to a basal orientation and elimination of pathways for oxygen into the bulk through compaction of surface and subsurface voids. American Chemical Society 2023-01-11 /pmc/articles/PMC9887728/ /pubmed/36743857 http://dx.doi.org/10.1021/acsanm.2c04703 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Babuska, Tomas F.
Curry, John F.
Thorpe, Ryan
Chowdhury, Md. Istiaque
Strandwitz, Nicholas C.
Krick, Brandon A.
High-Sensitivity Low-Energy Ion Spectroscopy with Sub-Nanometer Depth Resolution Reveals Oxidation Resistance of MoS(2) Increases with Film Density and Shear-Induced Nanostructural Modifications of the Surface
title High-Sensitivity Low-Energy Ion Spectroscopy with Sub-Nanometer Depth Resolution Reveals Oxidation Resistance of MoS(2) Increases with Film Density and Shear-Induced Nanostructural Modifications of the Surface
title_full High-Sensitivity Low-Energy Ion Spectroscopy with Sub-Nanometer Depth Resolution Reveals Oxidation Resistance of MoS(2) Increases with Film Density and Shear-Induced Nanostructural Modifications of the Surface
title_fullStr High-Sensitivity Low-Energy Ion Spectroscopy with Sub-Nanometer Depth Resolution Reveals Oxidation Resistance of MoS(2) Increases with Film Density and Shear-Induced Nanostructural Modifications of the Surface
title_full_unstemmed High-Sensitivity Low-Energy Ion Spectroscopy with Sub-Nanometer Depth Resolution Reveals Oxidation Resistance of MoS(2) Increases with Film Density and Shear-Induced Nanostructural Modifications of the Surface
title_short High-Sensitivity Low-Energy Ion Spectroscopy with Sub-Nanometer Depth Resolution Reveals Oxidation Resistance of MoS(2) Increases with Film Density and Shear-Induced Nanostructural Modifications of the Surface
title_sort high-sensitivity low-energy ion spectroscopy with sub-nanometer depth resolution reveals oxidation resistance of mos(2) increases with film density and shear-induced nanostructural modifications of the surface
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9887728/
https://www.ncbi.nlm.nih.gov/pubmed/36743857
http://dx.doi.org/10.1021/acsanm.2c04703
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