INVESTIGADORES
SCAFFARDI Lucia Beatriz
artículos
Título:
SIZING GOLD NANOPARTICLES BY OPTICAL EXTINCTION SPECTROSCOPY
Autor/es:
L. B. SCAFFARDI; N. PELLEGRI; O. DE SANCTIS; J. O. TOCHO
Revista:
NANOTECHNOLOGY
Editorial:
Institute of Physics Publishing (IOP)
Referencias:
Lugar: Londres; Año: 2005 vol. 16 p. 158 - 163
ISSN:
0957-4484
Resumen:
The measurement of optical extinction is used to determine the size of
nearly spherical gold nanoparticles suspended in solution, produced by a
reverse micelles process. The contrast between the maximum and the
minimum in the extinction spectra around 450 and 520 nm shows a linear
dependence with the mean radius of the gold particles less than 3 nm;
however, the method can be used to size particles up to 7 nm. Experimental
results for extinction spectra can be fitted by Mies theory if the optical
constants from bulk material values are modified by introducing the
limitation of the mean free path due to collisions of conduction electrons
with the boundary of the nanoparticles.