Abstract
Reduced graphene oxide-nanocrystalline platinum (RGO-Pt) hybrid materials were synthesized by simultaneous co-reduction of graphene oxide (GO) and chloroplatinic acid with sodium citrate in water at 80°C, of pH 7 and 10. The resultant RGO-Pt hybrid materials were characterized using transmission electron microscopy (TEM), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy, and thermogravimetric analysis. Platinum (Pt) nanoparticles were anchored randomly onto the reduced GO (RGO) sheets with average mean diameters of 1.76 (pH 7) and 1.93 nm (pH 10). The significant Pt diffraction peaks and the decreased intensity of (002) peak in the XRD patterns of RGO-Pt hybrid materials confirmed that the Pt nanoparticles were anchored onto the RGO sheets and intercalated into the stacked RGO layers at these two pH values. The Pt loadings for the hybrid materials were determined as 36.83 (pH 7) and 49.18% (pH 10) by mass using XPS analysis. With the assistance of oleylamine, the resultant RGO-Pt hybrid materials were soluble in the nonpolar organic solvents, and the dispersion could remain stable for several months.
Highlights
Graphene, a flat monolayer of two-dimensional honeycomb-structured carbon atoms, has attracted tremendous attention from both theoretical and experimental studies in recent years [1,2,3,4,5,6]
The detailed characterizations of the reduced GO (RGO)-Pt hybrid materials carried out in this study provide us with an insight into the utilization of this new graphene-based material
The Reduced graphene oxide-nanocrystalline platinum (RGO-Pt)-2 can be dispersed in DI water, while RGO-Pt-7 and RGO-Pt-10 can be stably dispersed in nonpolar organic solvents assisted by OA
Summary
A flat monolayer of two-dimensional honeycomb-structured carbon atoms, has attracted tremendous attention from both theoretical and experimental studies in recent years [1,2,3,4,5,6]. Possessing similar properties, graphene has a larger surface area (theoretical value of ~2,600 m2/g [23] as unwrapped single-wall CNTs) than that of CNTs. graphene/reduced graphene oxide (RGO) can be produced at a lower cost through large-scale chemical synthesis [24,25]. Graphene/reduced graphene oxide (RGO) can be produced at a lower cost through large-scale chemical synthesis [24,25] All these advantages make the reduced graphene oxide-nanocrystalline
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