Surface and friction characterization of MoS2 and WS2 third body thin films under simulated wheel/rail rolling–sliding contact

Microtribology and Friction-Induced Material Transfer in Layered MoS2 Nanoparticles Sprayed on a Steel Surface

“…The weight decrease of 2 lm particles starts at around 400°C and is completed by 600°C. The change represents its thermal decomposition and the *20% weight loss in this temperature range is consistent with a conversion of MoS 2 to MoO 3 and gaseous SO 2 as reported previously [2,45,46]. This oxidation of MoS 2 by heating in air is believed to be dependent not only on temperature, but also on the particle size and availability of air [40].…”

Effect of the type, size and concentration of solid lubricants on the tribological properties of the polymer PEEK

“…One of the possible reason for the less-than-expected benefit is the fact that under certain conditions (exposure to oxygen, high temperature, humidity, etc. ), MoS₂ and WS₂ can oxidise into MoO 3 and WO 3 , causing poorer intra-crystalline slip, reduced lubrication properties, a shorter lifetime, a higher coefficient of friction and less wear performance [25][26][27]. Our XPS analyses conducted on the transfer films showed that more than 65 % of the MoS₂ and more than 75 % of the WS₂ was oxidized during the tribological sliding ( Figure 11), which confirmed this hypothesis.…”

MoS2/Si Heterojunction with Vertically Standing Layered Structure for Ultrafast, High‐Detectivity, Self‐Driven Visible–Near Infrared Photodetectors

“…The results are in good agreement with the reported values for the MoS 2 crystal. [46][47][48] Figure 2 a depicts the schematic illustration of the MoS 2 / Si heterojunction photodetector. The MoS 2 fi lm was deposited on the p-Si substrate with a predefi ned SiO 2 window via magnetron sputtering, so that the effective device area could be precisely determined by the window size (3 mm × 3 mm).…”