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Mild thermal reduction of graphene oxide as a lubrication additive for friction and wear reduction

Zhao, Jun, Li, Yingru, Wang, Yongfu, Mao, Junyuan, He, Yongyong, Luo, Jianbin
RSC advances 2017 v.7 no.3 pp. 1766-1770
X-ray photoelectron spectroscopy, additives, friction, graphene, graphene oxide, lubrication, oils, oxygen, temperature, transmission electron microscopy
Recently, studies on graphene-based lubrication additives have been widely researched, but few refer to their preparation by thermal reduction which shows potential in not only significantly lowering the mass-production cost, but also the simple, nonchemical process. In this study, mild thermal reduction of graphene oxide (MRGO) has been achieved by high temperature (700 °C) treatment and the product used as a lubrication additive. It shows a relatively ordered lamellar structure and a certain level of oxygen by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analysis, and exhibits excellent tribological properties as a lubrication additive. The friction coefficient can be reduced by as much as 30% and the rubbing surfaces display few scratches at a lower additive concentration (0.5 wt%) compared with that of base oil (Poly Alpha Olefins Type 6: PAO 6) without MRGO additive under the same friction conditions. Based on the advantages of green, low-cost and simple synthesis operation, the MRGO offers significant potential application as a lubrication additive.