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artículos
Título:
Films of Covalently-Bonded Gold Nanoparticles Synthesized by a Sol-Gel Process
Autor/es:
I. E. DELLERBA; C.E. HOPPE; R. J. J. WILLIAMS
Revista:
JOURNAL OF NANOPARTICLE RESEARCH
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2012 vol. 14 p. 1098 - 2005
ISSN:
1388-0764
Resumen:
Gold nanoparticles (NPs) with a size close
to 1.5 nm, coated with organic ligands bearing Si(OEt)3
groups, were synthesized and used to obtain selfstanding
films by a sol?gel process catalyzed by formic
acid. Using FESEM images, FTIR, and UV?visible
spectra, it was observed that very small gold NPs selfassembled
by Si?O?Si covalent bonds forming crosslinked
clusters with sizes up to about 50 nm in which
NPs preserve their individuality. The possibility of
fixing very small gold NPs in a crosslinked film opens a
variety of potential applications based on the specific
properties of small-size particles. As an example, we
illustrated the way in which one can take advantage of
the low melting temperature of these NPs to generate
tiny gold crystals partially embedded at the surface, a
process that might be used for the development of
catalysts or sensors. Besides, the shift and change in the
intensity of the plasmon band produced by heating to
100 C may be employed to develop an irreversible
sensor of undesirable temperature excursions during the
life-time of a specific product.