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High-quality reduced graphene oxide-nanocrystalline platinum hybrid materials prepared by simultaneous co-reduction of graphene oxide and chloroplatinic acid.

Wang Y, Liu J, Liu L, Sun DD - Nanoscale Res Lett (2011)

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore. JCLiu@ntu.edu.sg.

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.

No MeSH data available.


TEM images of (a) RGO-Pt-2, (b) RGO-Pt-7, (c) RGO-Pt-10, and (d) Pt-10.
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Figure 2: TEM images of (a) RGO-Pt-2, (b) RGO-Pt-7, (c) RGO-Pt-10, and (d) Pt-10.

Mentions: Figure 2 shows the TEM images of the RGO-Pt hybrid materials prepared at different pH values of 2, 7, and 10 and the Pt nanoparticles synthesized at pH 10. At pH 2 (Figure 2a), no Pt nanoparticles are observed on the GO sheets. This could be because citrate is unable to reduce H2PtCl6 in this acidic condition [42]. At pH 7 (Figure 2b) and pH 10 (Figure 2c), the RGO sheets are randomly decorated with Pt nanoparticles with diameters of the order of a few nanometers. The density of the Pt nanoparticles for RGO-Pt-10 is higher than that forRGOPt-7. Few aggregates of the Pt nanoparticles are observed, suggesting the strong interactions between the Pt nanoparticles and the RGO sheets [27,43]. However, without the support of the RGO sheets, the Pt nanoparticles synthesized at pH 10 are aggregated together, as shown in Figure 2d. This suggests the important role RGO plays in the co-reduction process to obtain unaggregated Pt nanoparticles.


High-quality reduced graphene oxide-nanocrystalline platinum hybrid materials prepared by simultaneous co-reduction of graphene oxide and chloroplatinic acid.

Wang Y, Liu J, Liu L, Sun DD - Nanoscale Res Lett (2011)

TEM images of (a) RGO-Pt-2, (b) RGO-Pt-7, (c) RGO-Pt-10, and (d) Pt-10.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211302&req=5

Figure 2: TEM images of (a) RGO-Pt-2, (b) RGO-Pt-7, (c) RGO-Pt-10, and (d) Pt-10.
Mentions: Figure 2 shows the TEM images of the RGO-Pt hybrid materials prepared at different pH values of 2, 7, and 10 and the Pt nanoparticles synthesized at pH 10. At pH 2 (Figure 2a), no Pt nanoparticles are observed on the GO sheets. This could be because citrate is unable to reduce H2PtCl6 in this acidic condition [42]. At pH 7 (Figure 2b) and pH 10 (Figure 2c), the RGO sheets are randomly decorated with Pt nanoparticles with diameters of the order of a few nanometers. The density of the Pt nanoparticles for RGO-Pt-10 is higher than that forRGOPt-7. Few aggregates of the Pt nanoparticles are observed, suggesting the strong interactions between the Pt nanoparticles and the RGO sheets [27,43]. However, without the support of the RGO sheets, the Pt nanoparticles synthesized at pH 10 are aggregated together, as shown in Figure 2d. This suggests the important role RGO plays in the co-reduction process to obtain unaggregated Pt nanoparticles.

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore. JCLiu@ntu.edu.sg.

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.

No MeSH data available.