A series of differently sized gold nanoparticles stabilized by bidentate calixarene ligands, prepared by the Brust–Schiffrin two-phase synthesis, were characterized by XPS, in combination with TEM. The experimental data show that the particular conditions in the synthesis reaction allow to obtain subnanometric gold nanoparticles. Such nanoparticles with controlled and reduced size are the best candidate for anchoring on a Si surface, through specific and reversible supramolecular interactions, in view of the development of new hybrid nanomaterials. XPS measurements allow to separate the Au atoms in two subsets, on the basis of their clearly distinct Au 4f binding energy: central and surface atoms bound to S. The S 2p spectra present a main component due to thiolate–Au bond, compatible with the structural ‘staple motif’ reported in the literature. Because very small nanoparticles have a larger percentage of surface atoms, the experimental S/Au and Au–S/Aucentral ratios are an indirect evaluation of the cluster nuclearity, likely to be assigned to Au11 or Au13, both compatible with the observed diameters.

Structural electronic study via XPS and TEM of subnanometric gold particles protected by calixarenes for silicon surface anchoring / A., Boccia; R., Zanoni; Arduini, Arturo; Pescatori, Luca; Secchi, Andrea. - In: SURFACE AND INTERFACE ANALYSIS. - ISSN 1096-9918. - 44:8(2012), pp. 1086-1090. [10.1002/sia.4842]

Structural electronic study via XPS and TEM of subnanometric gold particles protected by calixarenes for silicon surface anchoring

ARDUINI, Arturo;PESCATORI, Luca;SECCHI, Andrea
2012-01-01

Abstract

A series of differently sized gold nanoparticles stabilized by bidentate calixarene ligands, prepared by the Brust–Schiffrin two-phase synthesis, were characterized by XPS, in combination with TEM. The experimental data show that the particular conditions in the synthesis reaction allow to obtain subnanometric gold nanoparticles. Such nanoparticles with controlled and reduced size are the best candidate for anchoring on a Si surface, through specific and reversible supramolecular interactions, in view of the development of new hybrid nanomaterials. XPS measurements allow to separate the Au atoms in two subsets, on the basis of their clearly distinct Au 4f binding energy: central and surface atoms bound to S. The S 2p spectra present a main component due to thiolate–Au bond, compatible with the structural ‘staple motif’ reported in the literature. Because very small nanoparticles have a larger percentage of surface atoms, the experimental S/Au and Au–S/Aucentral ratios are an indirect evaluation of the cluster nuclearity, likely to be assigned to Au11 or Au13, both compatible with the observed diameters.
2012
Structural electronic study via XPS and TEM of subnanometric gold particles protected by calixarenes for silicon surface anchoring / A., Boccia; R., Zanoni; Arduini, Arturo; Pescatori, Luca; Secchi, Andrea. - In: SURFACE AND INTERFACE ANALYSIS. - ISSN 1096-9918. - 44:8(2012), pp. 1086-1090. [10.1002/sia.4842]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2443238
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 8
social impact