Superhydrophobic MoS2 Nanosheet-Cu2O Nanoparticle Antiwear Coatings

The superhydrophobic MoS2 nanosheet-Cu2O nanoparticle antiwear coatings were constructed by immersing the sputtered MoS2 coatings to a solution of CuSO4 and sodium citrate. The contact angle (CA) and sliding angle (SA) of the coatings were similar to 164 and 2 degrees, respectively. MoS2 nanosheets wrapped with Cu2O layers were similar to 54 nm thick. On the nanosheets, the Cu2O nanospheres were similar to 60 nm in size, and numerous Cu2O nanospheres aggregated into Cu2O clusters with 1-5 mu m length. The cooperation of microstructures (Cu2O clusters) and nanostructures (Cu2O nanoparticles) and the arrangement of the Cu2O clusters on the surface of the sputtered MoS2 coatings resulted in the superhydrophobic property of the MoS2 nanosheet-Cu2O nanoparticle coating. Besides, the MoS2 nanosheet-Cu2O nanoparticle coating showed outstanding stability and durability (almost 1 year) with superhydrophobic and tribological properties, including a relatively low friction coefficient (as low as 0.008-0.015) and a long antiwear life (similar to 1.0 x 10(6) r). During friction, Cu2O nanospheres can roll at the friction interface, show nanobearing effects, and then reduce the friction coefficient of the coatings.

Automated summary

The study constructed superhydrophobic MoS2 nanosheet-Cu2O nanoparticle antiwear coatings by immersing sputtered MoS2 coatings in a solution of CuSO4 and sodium citrate. The coatings exhibited outstanding stability and durability, with low friction coefficient and long antiwear life, attributed to the cooperation of microstructures and nanostructures.