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The development of water-based lubricants with well dispersed ultrafine particles is in high demand. In this article, graphene oxide (GO) nanosheets/carboxyl-functionalized multi-walled carbon nanotubes (MWCNTs–COOH) hybrids have been synthesized via vacuum filtration of a solution hybrid dispersion, as additives for water-based lubricants. The tribological performance of GO/MWCNTs–COOH hybrids in water was systematically investigated. The lubrication properties of water-based lubricant can be significantly improved by adding GO/MWCNTs–COOH hybrids in comparison with adding only GO nanosheets or MWCNTs–COOH as lubricant additives. Notably, the water with as little as 0.7 wt% of GO/MWCNTs–COOH hybrids exhibits the best lubrication performance in terms of friction and wear reduction. This unique tribological performance of GO/MWCNTs–COOH hybrids in water suggests the existence of a synergistic effect of GO and MWCNTs–COOH on reducing friction and wear.

Graphene oxide/carboxyl-functionalized multi-walled carbon nanotube hybrids: powerful additives for water-based lubrication