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

Abstract

The composites of graphene oxide (GO) nanosheets fabricated by a-Fe 2 O 3 nanorods were prepared through a facile hydrolysis route. As-synthesized a-Fe 2 O 3 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 a-Fe 2 O 3 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 a-Fe 2 O 3 nanorods. Tribological properties of a-Fe 2 O 3 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 a-Fe 2 O 3 nanorod/GO composites into the base oil. The oil with a-Fe 2 O 3 nanorod/GO composites showed better tribological properties than those in the oil with GO nanosheets. Good friction and wear properties of a-Fe 2 O 3 nanorod/GO composites can be explained by the combination of rolling effects between the rubbing surface and formed thin physical tribofilms on the substrate.

Graphene based metal and metal oxide nanocomposites: synthesis, properties and their applications

“…580 The SERS enhancement of single-layer graphene is much larger compared to graphene, and the enhancement of the G band was larger than that of the D band. [588][589][590][591] Ag NPs are known to exhibit the highest bactericidal activity and biocompatibility among all antibacterial nanomaterials. They have been applied as antiseptic, disinfectant and pharmaceutical agents.…”

Tribological characteristics of monodispersed cerium borate nanospheres in biodegradable rapeseed oil lubricant

“…9e, the peaks of O 1s at 533.0, 529.2, 530.2 and 531.4 eV were consistent with the chemical states of oxygen in B 2 O 3 , Fe 2 O 3 , CeO 2 , and carbonyl groups, respectively. These oxides played important roles in improving friction-reducing and antiwear capacities of rapeseed oil [10,32,33]. Thus, it can reasonably be inferred from the XPS analysis that the outstanding abilities of SA/CeBO 3 as rapeseed oil dopants in reducing friction and wear were mainly ascribed to the adsorptions of SA/CeBO 3 and rapeseed oil and to the tribo-reactions of SA/CeBO 3 on the friction surfaces to form a densely packed composite boundary lubrication film, in which very complicated tribo-interactions such as tribocrossbonding and tribo-codeposition, among SA/CeBO 3 , rapeseed oil, tribochemicals, and the tribomates might also be involved to fortify the film strength and to help reduce friction and wear [34].…”

Synthesis of nano-Cu/graphene oxide composites by supercritical CO2-assisted deposition as a novel material for reducing friction and wear

“…Recently, graphene and graphene oxide (GO) were confirmed to be the ideal substrates for anchoring nanoparticles on their nanosheet surfaces, due to their high loading capacity, strong intramolecular bonding, low surface energy and weak intermolecular bonding [9][10][11][12][13]. The as-prepared graphene-based composites have been applied in catalysis and other areas.…”