Synthesis, Characterization, and Tribological Behavior of Oleic Acid Capped Graphene Oxide

Abstract

Graphene oxide (GO) nanosheets were prepared by modified Hummers and Offeman methods. Furthermore, oleic acid (OA) capped graphene oxide (OACGO) nanosheets were prepared and characterized by means of Fourier transform‐infrared spectroscopy (FT‐IR), transmission electron microscopy (TEM), and X‐ray diffraction (XRD). At the same time, the friction and wear properties of OA capped graphite powder (OACG), OACGO, and oleic acid capped precipitate of graphite (OACPG) as additives in poly‐alpha‐olefin (PAO) were compared using four‐ball tester and SRV‐1 reciprocating ball‐on‐disc friction and wear tester. By the addition of OACGO to PAO, the antiwear ability was improved and the friction coefficient was decreased. Also, the tribological mechanism of the GO was investigated.