Synthesis of α-Fe2O3nanorod/graphene oxide composites and their tribological properties

Abstract

The composites of graphene oxide (GO) nanosheets fabricated by α-Fe₂O₃ nanorods were prepared through a facile hydrolysis route. As-synthesized α-Fe₂O₃ nanorods incorporated into GO nanosheets in the composites were observed with diameters of 3–5 nm and lengths of 15–30 nm. The formation mechanism of anchoring α-Fe₂O₃ nanorods onto GO nanosheets was proposed as the intercalation and adsorption of iron ions onto the surface of GO nanosheets, followed by the nucleation and growth of α-Fe₂O₃ nanorods. Tribological properties of α-Fe₂O₃ nanorod/GO composites as lubricating oil additive were investigated by employing a ball–plate tribotester. It is shown that anti-wear and reduced frictional abilities were improved by the addition of α-Fe₂O₃ nanorod/GO composites into the base oil. The oil with α-Fe₂O₃ nanorod/GO composites showed better tribological properties than those in the oil with GO nanosheets. Good friction and wear properties of α-Fe₂O₃ nanorod/GO composites can be explained by the combination of rolling effects between the rubbing surface and formed thin physical tribofilms on the substrate.