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Wang et al. Nanoscale Research Letters 2011, 6:241

Wang et al. Nanoscale Research Letters 2011, 6:241 http://www.nanoscalereslett.com/content/6/1/241 NANO EXPRESS Open Access High-quality reduced graphene oxidenanocrystalline platinum hybrid materials prepared by simultaneous co-reduction of graphene oxide and chloroplatinic acid Yinjie Wang, Jincheng Liu*, Lei Liu, Darren Delai Sun* Abstract Reduced graphene oxide-nanocrystalline platinum (RGO-Pt) hybrid materials were synthesized by simultaneous coreduction 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. | Wang et al. Nanoscale Research Letters 2011 6 241 http www.nanoscalereslett.eom content 6 1 241 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access High-quality reduced graphene oxidenanocrystalline platinum hybrid materials prepared by simultaneous co-reduction of graphene oxide and chloroplatinic acid Yinjie Wang Jincheng Liu Lei Liu Darren Delai Sun Abstract Reduced graphene oxide-nanocrystalline platinum RGO-Pt hybrid materials were synthesized by simultaneous coreduction 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. Introduction Graphene a flat monolayer of two-dimensional honeycomb-structured carbon atoms has attracted tremendous attention from both theoretical and experimental studies in recent years 1-6 . Its unique structural mechanical and electronic properties make it a promising candidate in many potential applications such as sensors 7-9 electrodes 10-13 lithium storage 14 15 and hydrogen storage 16 . It is well known that carbon nanotubes CNTs deposited with .