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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.


XPS spectrum shows the Au4f peaks of sample B.
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Figure 10: XPS spectrum shows the Au4f peaks of sample B.

Mentions: The curve-fitting analysis of the two spin-orbit components of the Au4f signal is shown in Figure 10. Two contributions were found, similarly to the spectra of the compounds benzylthiol-capped gold nanoparticles, above discussed. Also in this case, Au4f signal is structured and two pairs of spin-orbit components are founded; the first Au4f7/2 component at BE = 83.53 eV is associated with metallic gold atoms, while the second Au4f7/2 component at higher BE values (85.35 eV) is assigned to the Au atoms that are covalently bonded to sulfur terminal groups of benzylthiol. As shown in Table 3 S2p3/2 signal arises at about 161.81 eV, a BE value that is fully consistent with those reported in the literature for sulfur atoms bonded to metals, as already discussed for sample A1. The AuAu-S/S ratio value for this sample, evaluated by means of XPS semiquantitative analysis, is of about 0.90. This suggests that, as for sample A1, nearly all thiolate terminal groups are grafting the gold nanoparticle.


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)

XPS spectrum shows the Au4f peaks of sample B.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 10: XPS spectrum shows the Au4f peaks of sample B.
Mentions: The curve-fitting analysis of the two spin-orbit components of the Au4f signal is shown in Figure 10. Two contributions were found, similarly to the spectra of the compounds benzylthiol-capped gold nanoparticles, above discussed. Also in this case, Au4f signal is structured and two pairs of spin-orbit components are founded; the first Au4f7/2 component at BE = 83.53 eV is associated with metallic gold atoms, while the second Au4f7/2 component at higher BE values (85.35 eV) is assigned to the Au atoms that are covalently bonded to sulfur terminal groups of benzylthiol. As shown in Table 3 S2p3/2 signal arises at about 161.81 eV, a BE value that is fully consistent with those reported in the literature for sulfur atoms bonded to metals, as already discussed for sample A1. The AuAu-S/S ratio value for this sample, evaluated by means of XPS semiquantitative analysis, is of about 0.90. This suggests that, as for sample A1, nearly all thiolate terminal groups are grafting the gold nanoparticle.

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.