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- Title
Establishing links between storage environmental conditions, annealing parameters and water mobility in molybdenum disulfide coatings.
- Authors
Molina, Nicolas; Mangolini, Filippo
- Abstract
Molybdenum disulfide (MoS2) coatings are often used in tribological components working under inert and vacuum conditions due to their low steady-state coefficient of friction. However, prolonged periods of storage and dormancy of these components allow time for the diffusion of surface adsorbates, such as water, into the coating, modifying the overall friction behavior when sliding is resumed (i.e., aging effect). Despite the relevance of published studies on the surface chemical processes underpinning aging of MoS2 coatings, our understanding of the depth distribution of water within MoS2 thin films remains elusive. In this work, a depth-dependent, chemistry-informed study of the water mobility in non-contact area and wear track of MoS2 coatings aged in humid conditions and under various annealing treatments was performed. The depth distribution of water (OH--) and MoS2 (92MoOx-- and 92MoSx--) ion fragments were traced by time-of-flight secondary ion mass spectrometry (ToF-SIMS). The results reveal the significant influence of both the chemistry of the storage environment and annealing conditions on the mobility of water in MoS2. Altogether, this work provides valuable insights for the underlying mechanisms leading to variations in friction performance of MoS2 thin films across nanoscale and macroscale applications upon storage under different conditions.
- Subjects
MOLYBDENUM disulfide; NANOFILMS; SECONDARY ion mass spectrometry; SURFACE coatings; CHEMICAL processes; WATER distribution
- Publication
Tribology & Lubrication Technology, 2024, Vol 80, Issue 7, p30
- ISSN
1545-858X
- Publication type
Article