Abstract
Dodecyl amine edge functionalized few-layer graphene oxide quantum dots were synthesized in good yields. The covalent functionalization was demonstrated with NMR and AFM-IR. The resulting structure and particle size was measured with AFM and HRTEM. The thermal stability of the compound was investigated and showed a stability of up to 220 °C. The modified graphene oxide quantum dots showed excellent solubility in various organic solvents, including ethers, methanol, toluene, n-hexane, heptane, xylene, dichloromethane and toluene. The stability of a resulting toluene solution was also proven by static light scattering measurements over several days. The excellent solubility gives the possibility of an efficient and fast spray application of the functionalized graphene oxide quantum dots to steel surfaces. Hence, the macroscopic friction behavior was investigated with a Thwing-Albert FP-2250 friction tester. A thin film of the dodecyl amine functionalized graphene oxide quantum dots on steel lowered the friction coefficient from 0.17 to 0.11 and revealed a significant corrosion inhibition effect.
Highlights
Graphene is a two dimensional, single-atom-thick sheet of hexagonally constructed sp2-bonded carbon atoms[12,13]
The resulting material GQDCOOH 2 was analyzed by X-ray diffraction (XRD), Raman and atomic force microscopy (AFM)
It was possible to show with different methods that the successful covalent modification of graphene quantum dots (GQDs) with dodecyl amine was achieved
Summary
Graphene is a two dimensional, single-atom-thick sheet of hexagonally constructed sp2-bonded carbon atoms[12,13]. The surface functionalization can increase the solubility and stabilize single graphene sheets This introduces sp[3] centers on the graphene sheets, which can influence the behavior of graphene[29,30]. Since functionalized graphene oxide quantum dots have not been applied as lubricants so far, we were interested in the functionalization of graphene oxide quantum dots and to influence their behavior as lubricants for steel. In this process, a high solubility of graphene material in different solvents would be beneficial. The ability to predominantly functionalize the edges of graphene sheets leaves the sheet structure intact and the less sp[3] centers are present in the sheets the more the original electronic behavior of the graphene nanosheets is preserved
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