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Mono- and bi-functional arenethiols as surfactants for gold nanoparticles: synthesis and characterization.

Vitale F, Fratoddi I, Battocchio C, Piscopiello E, Tapfer L, Russo MV, Polzonetti G, Giannini C - Nanoscale Res Lett (2011)

Bottom Line: Stable gold nanoparticles stabilized by different mono and bi-functional arenethiols, namely, benzylthiol and 1,4-benzenedimethanethiol, have been prepared by using a modified Brust's two-phase synthesis.Nanocrystals diameters have been tuned in the range 2 ÷ 9 nm by a proper variation of Au/S molar ratio.In particular, the formation of networks has been observed with interconnected gold nanoparticles containing 1,4-benzenedimethanethiol as ligand.

View Article: PubMed Central - HTML - PubMed

Affiliation: ENEA (Italian National Agency for New Technologies, Energy and the Sustainable Economic Development), UTTMATB (Technical Unit of Materials Technologies - Brindisi), Brindisi Research Centre, S,S, 7 Appia km, 706, 72100 Brindisi, Italy. floriana.vitale@enea.it.

ABSTRACT
Stable gold nanoparticles stabilized by different mono and bi-functional arenethiols, namely, benzylthiol and 1,4-benzenedimethanethiol, have been prepared by using a modified Brust's two-phase synthesis. The size, shape, and crystalline structure of the gold nanoparticles have been determined by high-resolution electron microscopy and full-pattern X-ray powder diffraction analyses. Nanocrystals diameters have been tuned in the range 2 ÷ 9 nm by a proper variation of Au/S molar ratio. The chemical composition of gold nanoparticles and their interaction with thiols have been investigated by X-ray photoelectron spectroscopy. In particular, the formation of networks has been observed with interconnected gold nanoparticles containing 1,4-benzenedimethanethiol as ligand.

No MeSH data available.


Experimental X-ray diffraction pattern of sample B. The average Au particle size is 2.3 nm. The inset shows the experimental (111) and (200) Au peaks together with the fitted curves.
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Figure 8: Experimental X-ray diffraction pattern of sample B. The average Au particle size is 2.3 nm. The inset shows the experimental (111) and (200) Au peaks together with the fitted curves.

Mentions: The X-ray diffraction pattern of a sample with Au/S ratio of 0.75:1 exhibits the characteristic (111), (200), (220), and (311) Bragg peaks of the gold nanocrystals (Figure 8). The inset shows the experimental (111) and (200) Bragg peaks and the fitted curves (Cauchy functions). By using Scherrer's formula, from the full-width-of-half-maxima (FWHM) of the fitted curves, an average particle diameter of about ∅ = 2.3 nm is obtained. The diffraction pattern shows also Bragg-like peaks at small scattering angle (2θ <30°). These peaks are probably due to the non-reacted bi-functional thiols that are trapped within the network and cannot be easily removed by washing or by other purification methods without damaging or destroying the network itself.


Mono- and bi-functional arenethiols as surfactants for gold nanoparticles: synthesis and characterization.

Vitale F, Fratoddi I, Battocchio C, Piscopiello E, Tapfer L, Russo MV, Polzonetti G, Giannini C - Nanoscale Res Lett (2011)

Experimental X-ray diffraction pattern of sample B. The average Au particle size is 2.3 nm. The inset shows the experimental (111) and (200) Au peaks together with the fitted curves.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211147&req=5

Figure 8: Experimental X-ray diffraction pattern of sample B. The average Au particle size is 2.3 nm. The inset shows the experimental (111) and (200) Au peaks together with the fitted curves.
Mentions: The X-ray diffraction pattern of a sample with Au/S ratio of 0.75:1 exhibits the characteristic (111), (200), (220), and (311) Bragg peaks of the gold nanocrystals (Figure 8). The inset shows the experimental (111) and (200) Bragg peaks and the fitted curves (Cauchy functions). By using Scherrer's formula, from the full-width-of-half-maxima (FWHM) of the fitted curves, an average particle diameter of about ∅ = 2.3 nm is obtained. The diffraction pattern shows also Bragg-like peaks at small scattering angle (2θ <30°). These peaks are probably due to the non-reacted bi-functional thiols that are trapped within the network and cannot be easily removed by washing or by other purification methods without damaging or destroying the network itself.

Bottom Line: Stable gold nanoparticles stabilized by different mono and bi-functional arenethiols, namely, benzylthiol and 1,4-benzenedimethanethiol, have been prepared by using a modified Brust's two-phase synthesis.Nanocrystals diameters have been tuned in the range 2 ÷ 9 nm by a proper variation of Au/S molar ratio.In particular, the formation of networks has been observed with interconnected gold nanoparticles containing 1,4-benzenedimethanethiol as ligand.

View Article: PubMed Central - HTML - PubMed

Affiliation: ENEA (Italian National Agency for New Technologies, Energy and the Sustainable Economic Development), UTTMATB (Technical Unit of Materials Technologies - Brindisi), Brindisi Research Centre, S,S, 7 Appia km, 706, 72100 Brindisi, Italy. floriana.vitale@enea.it.

ABSTRACT
Stable gold nanoparticles stabilized by different mono and bi-functional arenethiols, namely, benzylthiol and 1,4-benzenedimethanethiol, have been prepared by using a modified Brust's two-phase synthesis. The size, shape, and crystalline structure of the gold nanoparticles have been determined by high-resolution electron microscopy and full-pattern X-ray powder diffraction analyses. Nanocrystals diameters have been tuned in the range 2 ÷ 9 nm by a proper variation of Au/S molar ratio. The chemical composition of gold nanoparticles and their interaction with thiols have been investigated by X-ray photoelectron spectroscopy. In particular, the formation of networks has been observed with interconnected gold nanoparticles containing 1,4-benzenedimethanethiol as ligand.

No MeSH data available.