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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 close to the Au4f peaks of sample A1.
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Figure 7: XPS spectrum close to the Au4f peaks of sample A1.

Mentions: The C1s and S2p BE values are quite close for all the analyzed samples, showing that the size of gold nanoparticles does not affect the linked thiol chemical structure. Considering for example sample A1, two contributions were found by curve-fitting analysis of the two spin-orbit components of the Au4f signal (Figure 7). The Au4f7/2 component of the peak at lower BE values (83.69 eV) is attributed to metallic gold, the latter Au4f7/2 component at BE = 85.04 eV can be associated to the Au atoms that are covalently bonded to sulfur terminal groups of benzylthiol. As shown in Table 2, S2p BE value is of about 161.8 eV, fully consistent with sulfur atoms chemically interacting with metals [28]; furthermore, the semiquantitative analysis indicates that AuAu-S/S ratio is of about 0.75, thus indicating that nearly all thiol terminal groups are grafting the gold nanoparticle. The same characterization has been carried out for A2-4 samples and a fairly good agreement in semiquantitative XPS analysis has been observed.


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 close to the Au4f peaks of sample A1.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 7: XPS spectrum close to the Au4f peaks of sample A1.
Mentions: The C1s and S2p BE values are quite close for all the analyzed samples, showing that the size of gold nanoparticles does not affect the linked thiol chemical structure. Considering for example sample A1, two contributions were found by curve-fitting analysis of the two spin-orbit components of the Au4f signal (Figure 7). The Au4f7/2 component of the peak at lower BE values (83.69 eV) is attributed to metallic gold, the latter Au4f7/2 component at BE = 85.04 eV can be associated to the Au atoms that are covalently bonded to sulfur terminal groups of benzylthiol. As shown in Table 2, S2p BE value is of about 161.8 eV, fully consistent with sulfur atoms chemically interacting with metals [28]; furthermore, the semiquantitative analysis indicates that AuAu-S/S ratio is of about 0.75, thus indicating that nearly all thiol terminal groups are grafting the gold nanoparticle. The same characterization has been carried out for A2-4 samples and a fairly good agreement in semiquantitative XPS analysis has been observed.

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.