INVESTIGADORES
TORCHIA Gustavo Adrian
artículos
Título:
Optical extinction for determining size distribution of gold nanoparticles fabricated by ultrashort pulsed laser ablation
Autor/es:
G.A. TORCHIA, L. SCAFFARDI, C. MENDEZ, P. MORENO, J.O. TOCHO AND L. ROSO
Revista:
APPLIED PHYSICS. A - MATERIALS SCIENCE AND PROCESSING
Editorial:
SPRINGER
Referencias:
Año: 2008
ISSN:
0947-8396
Resumen:
This work presents a method based on measurements of optical extinction spectra to determine the size of spherical gold nanoparticles produced using femtosecond laser ablation process in deionized water. By using an improved theoretical model that modifies the contribution of the free electrons to the dielectric function introducing a size-dependent term, it is possible to fit the full experimental extinction spectrum considering a determined size distribution. Additionally, in order to obtain complementary measurements of size distribution, TEM analysis was performed. The results obtained showed that the predominant nanoparticle size distribution ranges from 1 nm to 11 nm radii. Optical extinction measurement together with an appropriate theoretical model based on Mie´s theory represents a simple, low cost, fast and easy method to describe a multimodal size distribution of spherical gold nanoparticles.
