Determination of the size distribution of metallic nanoparticles by optical extinction spectroscopy

A method is proposed to estimate the size distribution of nearly spherical metallic nanoparticles (NPs) from optical extinction spectroscopy (OES) measurements based on Mie's theory and an optimization algorithm. The described method is compared against two of the most widely used techniques fo...

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Bibliographic Details
Published in:Applied optics. Optical technology and biomedical optics 2009-01, Vol.48 (3), p.566
Main Authors: Peña, Ovidio, Rodríguez-Fernández, Luis, Rodríguez-Iglesias, Vladimir, Kellermann, Guinther, Crespo-Sosa, Alejandro, Cheang-Wong, Juan Carlos, Silva-Pereyra, Héctor Gabriel, Arenas-Alatorre, Jesús, Oliver, Alicia
Format: Article
Language:English
Subjects:
Algorithms
Copper - chemistry
Gold - chemistry
Metal Nanoparticles - analysis
Metal Nanoparticles - chemistry
Microscopy, Electron, Transmission
Models, Statistical
Nanotechnology - methods
Normal Distribution
Optics and Photonics
Scattering, Radiation
Spectrum Analysis - methods
Static Electricity
X-Rays
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Summary:A method is proposed to estimate the size distribution of nearly spherical metallic nanoparticles (NPs) from optical extinction spectroscopy (OES) measurements based on Mie's theory and an optimization algorithm. The described method is compared against two of the most widely used techniques for the task: transmission electron microscopy (TEM) and small-angle x-ray scattering (SAXS). The size distribution of Au and Cu NPs, obtained by ion implantation in silica and a subsequent thermal annealing in air, was determined by TEM, grazing-incidence SAXS (GISAXS) geometry, and our method, and the average radius obtained by all the three techniques was almost the same for the two studied metals. Concerning the radius dispersion (RD), OES and GISAXS give very similar results, while TEM considerably underestimates the RD of the distribution.
ISSN:2155-3165
DOI:10.1364/AO.48.000566