About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Chemistry and Physics of Interfaces
|
Presentation Title |
Environmentally-induced Degradation of Friction in Molybdenum Disulfide Films |
Author(s) |
Michael Chandross, N. Scott Bobbitt, John F Curry, Taisuke Ohta, Frank DelRio, Philip Mantos, Morgan Jones, Tomas Babuska, Michael Dugger |
On-Site Speaker (Planned) |
Michael Chandross |
Abstract Scope |
Molybdenum disulfide is widely used as a solid lubricant because of weak interactions between lamellae that result in low friction in dry environments. The initial stages of sliding are crucial for the development of low friction films, and exposure to oxygen and water significantly degrades the tribological response. Defect sites on flake edges provide locations for chemical reactions with environmental species. We present simulations of the binding of these species on pure and defective MoS2, and the effects on the tribological properties. We present analysis of the energetics of bonding and show that a major effect of the environmental species is the interruption of inter-flake bonding. These results are confirmed via photoelectron emission microscopy (PEEM) and Kelvin probe force microscopy (KPFM) that were used to determine work function changes in shear modified material. |
Proceedings Inclusion? |
Planned: |
Keywords |
Environmental Effects, Modeling and Simulation, Thin Films and Interfaces |