title: Surface functionalization of WS2 fullerene-like nanoparticles.
abstract: WS(2) belongs to a family of layered metal dichalcogenide compounds that are known to form cylindrical (inorganic nanotubes-INT) and polyhedral nanostructures--onion or nested fullerene-like (IF) particles. The outermost layers of these IF nanoparticles can be peeled under shear stress, thus IF nanoparticles have been studied for their use as solid lubricants. However, the IF nanoparticles tend to agglomerate, presumably because of surface structural defects induced by elastic strain and curvature, a fact that has a deleterious effect on their tribological properties. In the present work, chemical modification of the IF-WS(2) surface with alkyl-silane molecules is reported. The surface-modified IF nanoparticles display improved dispersion in oil-based suspensions. The alkyl-silane coating reduces the IF-WS(2) nanoparticles' tendency to agglomerate and consequently improves the long-term tribological behavior of oil formulated with the IF additive.
authors: Department of Materials and Interfaces, Weizmann Institute, Rehovot 76100, Israel.
authors: Chen
authors: C
authors: Shahar
authors: David
authors: D
authors: Zbaida
authors: Lev
authors: L
authors: Rapoport
authors: Hagai
authors: H
authors: Cohen
authors: Tatyana
authors: T
authors: Bendikov
authors: Johny
authors: J
authors: Tannous
authors: Fabrice
authors: F
authors: Dassenoy
authors: Reshef
authors: R
authors: Tenne