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Quality Control Metrics to Assess MoS2 Sputtered Films for Tribological Applications

https://doi.org/10.1007/s11249-022-01642-y

Babuska, Tomas F.; Curry, John F.; Dugger, Michael T.; Jones, Morgan R.; DelRio, Frank W.; Lu, Ping; Xin, Yan; Grejtak, Tomas; Chrostowski, Robert; Mangolini, Filippo; et al (August 2022, Tribology Letters)

Abstract Pure molybdenum disulfide (MoS₂) solid lubricant coatings could attain densities comparable to doped films (and the associated benefits to wear rate and environmental stability) through manipulation of the microstructure via deposition parameters. Unfortunately, pure films can exhibit highly variable microstructures and mechanical properties due to processes that are not controlled during deposition (i.e., batch-to-batch variation). This work focuses on developing a relationship between density, hardness, friction, and wear for pure sputtered MoS₂coatings. Results show that dense films (ρ = 4.5 g/cm³) exhibit a 100 × lower wear rate compared to porous coatings (ρ = 3.04–3.55 g/cm³). The tribological performance of high density pure MoS₂coatings is shown to surpass that of established composite coatings, achieving a wear rate 2 × (k = 5.74 × 10^–8mm³/Nm) lower than composite MoS₂/Sb₂O₃/Au in inert environments.
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Effects of deposition temperature on the wear behavior and material properties of plasma enhanced atomic layer deposition (PEALD) titanium vanadium nitride thin films

https://doi.org/10.1016/j.wear.2023.204731

Van_Meter, Kylie E; Chowdhury, Md Istiaque; Sowa, Mark J; Kozen, Alexander C; Grejtak, Tomas; Babuska, Tomas F; Strandwitz, Nicholas C; Krick, Brandon A (June 2023, Wear)

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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

https://doi.org/10.1021/acsanm.2c04703

Babuska, Tomas F.; Curry, John F.; Thorpe, Ryan; Chowdhury, Md. Istiaque; Strandwitz, Nicholas C.; Krick, Brandon A. (January 2023, ACS Applied Nano Materials)
Role of Environment on the Shear-Induced Structural Evolution of MoS ₂ and Impact on Oxidation and Tribological Properties for Space Applications

https://doi.org/10.1021/acsami.1c24931

Babuska, Tomas F.; Curry, John F.; Dugger, Michael T.; Lu, Ping; Xin, Yan; Klueter, Sam; Kozen, Alexander C.; Grejtak, Tomas; Krick, Brandon A. (March 2022, ACS Applied Materials & Interfaces)
Plasma-enhanced atomic layer deposition of titanium molybdenum nitride: Influence of RF bias and substrate structure

https://doi.org/10.1116/6.0001175

Chowdhury, Md. Istiaque; Sowa, Mark; Van Meter, Kylie E.; Babuska, Tomas F.; Grejtak, Tomas; Kozen, Alexander C.; Krick, Brandon A.; Strandwitz, Nicholas C. (September 2021, Journal of Vacuum Science & Technology A)

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Plasma enhanced atomic layer deposition of titanium nitride-molybdenum nitride solid solutions

https://doi.org/10.1116/6.0000717

Chowdhury, Md. Istiaque; Sowa, Mark; Kozen, Alexander C.; Krick, Brandon A.; Haik, Jewel; Babuska, Tomas F.; Strandwitz, Nicholas C. (January 2021, Journal of Vacuum Science & Technology A)
Plasma-enhanced atomic layer deposition of vanadium nitride

https://doi.org/10.1116/1.5109671

Kozen, Alexander C.; Sowa, Mark J.; Ju, Ling; Strandwitz, Nicholas C.; Zeng, Guosong; Babuska, Tomas F.; Hsain, Zakaria; Krick, Brandon A. (December 2019, Journal of Vacuum Science & Technology A)

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