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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.


Bright field TEM images of benzylthiol-gold nanoparticles prepared with Au/S molar ratio 15:1 (A4) taken with different magnification. The particle agglomeration is well pronounced (a) and only very few isolated particles can be observed (b, c). The average particle size is about 9 nm (c).
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Figure 6: Bright field TEM images of benzylthiol-gold nanoparticles prepared with Au/S molar ratio 15:1 (A4) taken with different magnification. The particle agglomeration is well pronounced (a) and only very few isolated particles can be observed (b, c). The average particle size is about 9 nm (c).

Mentions: The aggregation phenomena become evident for increasing Au/S molar ratio values as shown in Figure 6; in fact a few number of BzT molecules constitute the stabilizing shell around the metal nanoparticles and aggregation occurs. The TEM images (a), (b), and (c) are taken at increasing magnification of the sample A4 prepared with Au/S molar ratio 15:1. The TEM analysis clearly shows that with increasing Au:S molar ratio also the particle aggregation and the mean particle size increases (diameter ≈ 9 nm) as measured on isolated nanoclusters in Figure 4c.


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)

Bright field TEM images of benzylthiol-gold nanoparticles prepared with Au/S molar ratio 15:1 (A4) taken with different magnification. The particle agglomeration is well pronounced (a) and only very few isolated particles can be observed (b, c). The average particle size is about 9 nm (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 6: Bright field TEM images of benzylthiol-gold nanoparticles prepared with Au/S molar ratio 15:1 (A4) taken with different magnification. The particle agglomeration is well pronounced (a) and only very few isolated particles can be observed (b, c). The average particle size is about 9 nm (c).
Mentions: The aggregation phenomena become evident for increasing Au/S molar ratio values as shown in Figure 6; in fact a few number of BzT molecules constitute the stabilizing shell around the metal nanoparticles and aggregation occurs. The TEM images (a), (b), and (c) are taken at increasing magnification of the sample A4 prepared with Au/S molar ratio 15:1. The TEM analysis clearly shows that with increasing Au:S molar ratio also the particle aggregation and the mean particle size increases (diameter ≈ 9 nm) as measured on isolated nanoclusters in Figure 4c.

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.