INVESTIGADORES
RUBERT Aldo Alberto
artículos
Título:
New Insights into the Chemistry of Thiolate-Protected Palladium Nanoparticles
Autor/es:
GASTÓN CORTHEY; ALDO A. RUBERT; A. LORENA PICONE; GILBERTO CASILLAS; LISANDRO J. GIOVANETTI; JOSÉ M. RAMALLO-LÓPEZ; EUGENIA ZELAYA; GUILLERMO A. BENITEZ; FÉLIX G. REQUEJO; MIGUEL JOSÉ-YACAMÁN; ROBERTO C. SALVAREZZA; MARIANO H. FONTICELLI
Revista:
JOURNAL OF PHYSICAL CHEMISTRY C
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2012 p. 9830 - 9837
ISSN:
1932-7447
Resumen:
This paper establishes the chemical nature of Pd nanoparticles
protected by alkanethiolates that were prepared through a ligand placeexchange
approach and the two-phase method, first developed for Au
nanoparticles by Brust and Schiffrin. After 10 years since the first study on
this kind of Pd nanoparticles was published, the surface composition of the
particles is a matter of debate in the literature and it has not been
unambiguously assessed. The nanoparticles were studied by means of several
techniques: UV−visible spectroscopy, scanning transmission electron
microscopy, Fourier-transform infrared spectroscopy, extended X-ray
absorption fine structure, and X-ray photoelectron spectroscopy. The experimental data, obtained for the 3 nm diameter Pd
particles, prepared by both synthetic routes, are consistent with nanoparticles composed by Pd(0) cores surrounded by a
submonolayer of sulfide species, which are protected by alkanethiolates. Also, we unambiguously demonstrate that the chemical
nature of these particles is very similar to that experimentally found for alkanethiolate-modified bulk Pd. The results from this
paper are important not only for handling thiolate-protected Pd nanoparticles in catalysis and sensing, but also for the basic
comprehension of metallic nanoparticles and the relation of their surface structure with the synthesis method.