|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Functional Nanomaterials: Functional Low-Dimensional (0D, 1D, 2D) Materials 2022
||The effects of water and oxygen on the tribological response of molybdenum disulfide
||Michael E. Chandross, N. Scott Bobbitt, John F. Curry, Taisuke Ohta, Frank W. DelRio, Ping Lu, Philip Mantos, Morgan Jones, Nicolas Argibay, Michael T. Dugger
|On-Site Speaker (Planned)
||Michael E. Chandross
The initial stages of sliding, when large, defect-free, basally oriented surfaces are formed, are crucial for the development of low friction MoS2 films. However, oxygen and water significantly degrade the tribological response due to interactions at defects. We present the results of simulations of the binding of these species on pure and defective MoS2, and the ultimate effects on the tribological properties. We show that a major effect is the interruption of inter-flake bonding during run-in. 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. These results suggest that the evolution in the friction behavior of MoS2 is linked primarily to the formation or inhibition of a basally oriented, molecularly-thin surface film with long-range order.
SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.
||Thin Films and Interfaces, Modeling and Simulation, Mechanical Properties