Reduction of functionalized graphite oxides by trioctylphosphine in non-polar organic solvents
Liu, Jincheng, Jeong, Huiseong, Liu, Jinzhang, Lee, Kyungmoon, Park, Ji-Yong, Ahn, YeongHwan, & Lee, Soonil (2010) Reduction of functionalized graphite oxides by trioctylphosphine in non-polar organic solvents. Carbon, 48(8), pp. 2282-2289.
Graphene, functionalized with oleylamine (OA) and soluble in non-polar organic solvents, was produced on a large scale with a high yield by combining the Hummers process for graphite oxidation, an amine-coupling process to make OA-functionalized graphite oxide (OA-GO), and a novel reduction process using trioctylphosphine (TOP). TOP acts as both a reducing agent and an aggregation-prevention surfactant in the reduction of OA-GO in 1,2-dichlorobenzene (DCB). The reduction of OA-GO is confirmed by X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and Raman spectroscopy. The exfoliation of GO, OA GO, and OA-functionalized graphene (OA-G) is verified by atomic force microscopy. The conductivity of TOP-reduced OA G, which is deduced from the current–voltage characteristics of a vacuum-filtered thin film, shows that the reduction of functionalized GO by TOP is as effective as the reduction of GO by hydrazine.
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