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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-7 and (b) RGO-Pt-10; HRTEM images of (c) RGO-Pt-7 and (d) RGO-Pt-10; and Pt particle-size counts and probability curves of (e) RGO-Pt-7 and (f) RGO-Pt-10 (250 particles were randomly selected for the calculation from (a) and (b), respectively).
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Figure 3: TEM images of (a) RGO-Pt-7 and (b) RGO-Pt-10; HRTEM images of (c) RGO-Pt-7 and (d) RGO-Pt-10; and Pt particle-size counts and probability curves of (e) RGO-Pt-7 and (f) RGO-Pt-10 (250 particles were randomly selected for the calculation from (a) and (b), respectively).

Mentions: Enlarged TEM images (Figure 3a, b) show that the Pt nanoparticles on the graphene sheets are mostly quasi-spherical in shape. Figure 3e, f, shows the size distribution analysis performed by selecting 250 Pt nanoparticles from Figure 3a, b, respectively. For both the samples prepared at pH 7 and 10, the mean diameters of the Pt nanoparticles fall within the range of 1-4 nm, and it is mainly between 1 and 2 nm. Furthermore, no significant difference in the sizes of the Pt nanoparticles was observed for the samples synthesized at these two pH values.


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-7 and (b) RGO-Pt-10; HRTEM images of (c) RGO-Pt-7 and (d) RGO-Pt-10; and Pt particle-size counts and probability curves of (e) RGO-Pt-7 and (f) RGO-Pt-10 (250 particles were randomly selected for the calculation from (a) and (b), respectively).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: TEM images of (a) RGO-Pt-7 and (b) RGO-Pt-10; HRTEM images of (c) RGO-Pt-7 and (d) RGO-Pt-10; and Pt particle-size counts and probability curves of (e) RGO-Pt-7 and (f) RGO-Pt-10 (250 particles were randomly selected for the calculation from (a) and (b), respectively).
Mentions: Enlarged TEM images (Figure 3a, b) show that the Pt nanoparticles on the graphene sheets are mostly quasi-spherical in shape. Figure 3e, f, shows the size distribution analysis performed by selecting 250 Pt nanoparticles from Figure 3a, b, respectively. For both the samples prepared at pH 7 and 10, the mean diameters of the Pt nanoparticles fall within the range of 1-4 nm, and it is mainly between 1 and 2 nm. Furthermore, no significant difference in the sizes of the Pt nanoparticles was observed for the samples synthesized at these two pH values.

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.