Determination of plasma frequency, damping constant, and size distribution from the complex dielectric function of noble metal nanoparticles

This paper develops a novel method for simultaneously determining the plasma frequency ωP and the damping constant γfree in the bulk damped oscillator Drude model, based on experimentally measured real and imaginary parts of the metal refractive index in the IR wavelength range, lifting the usual ap...

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Autores principales: Mendoza Herrera, Luis Joaquín, Muñetón Arboleda, David, Schinca, Daniel Carlos, Scaffardi, Lucía Beatriz
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/98362
https://ri.conicet.gov.ar/11336/11972
http://aip.scitation.org/doi/10.1063/1.4904349
Aporte de:
id I19-R120-10915-98362
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Damping constant
Dielectric function
Noble metals
spellingShingle Física
Damping constant
Dielectric function
Noble metals
Mendoza Herrera, Luis Joaquín
Muñetón Arboleda, David
Schinca, Daniel Carlos
Scaffardi, Lucía Beatriz
Determination of plasma frequency, damping constant, and size distribution from the complex dielectric function of noble metal nanoparticles
topic_facet Física
Damping constant
Dielectric function
Noble metals
description This paper develops a novel method for simultaneously determining the plasma frequency ωP and the damping constant γfree in the bulk damped oscillator Drude model, based on experimentally measured real and imaginary parts of the metal refractive index in the IR wavelength range, lifting the usual approximation that restricts frequency values to the UV-deep UV region. Our method was applied to gold, silver, and copper, improving the relative uncertainties in the final values for ωp (0.5%–1.6%) and for γfree (3%–8%), which are smaller than those reported in the literature. These small uncertainties in ωp and γfree determination yield a much better fit of the experimental complex dielectric function. For the case of nanoparticles (Nps), a series expansion of the Drude expression (which includes ωp and γfree determined using our method) enables size-dependent dielectric function to be written as the sum of three terms: the experimental bulk dielectric function plus two size corrective terms, one for free electron, and the other for bound-electron contributions. Finally, size distribution of nanometric and subnanometric gold Nps in colloidal suspension was determined through fitting its experimental optical extinction spectrum using Mie theory based on the previously determined dielectric function. Results are compared with size histogram obtained from Transmission Electron Microscopy (TEM).
format Articulo
Articulo
author Mendoza Herrera, Luis Joaquín
Muñetón Arboleda, David
Schinca, Daniel Carlos
Scaffardi, Lucía Beatriz
author_facet Mendoza Herrera, Luis Joaquín
Muñetón Arboleda, David
Schinca, Daniel Carlos
Scaffardi, Lucía Beatriz
author_sort Mendoza Herrera, Luis Joaquín
title Determination of plasma frequency, damping constant, and size distribution from the complex dielectric function of noble metal nanoparticles
title_short Determination of plasma frequency, damping constant, and size distribution from the complex dielectric function of noble metal nanoparticles
title_full Determination of plasma frequency, damping constant, and size distribution from the complex dielectric function of noble metal nanoparticles
title_fullStr Determination of plasma frequency, damping constant, and size distribution from the complex dielectric function of noble metal nanoparticles
title_full_unstemmed Determination of plasma frequency, damping constant, and size distribution from the complex dielectric function of noble metal nanoparticles
title_sort determination of plasma frequency, damping constant, and size distribution from the complex dielectric function of noble metal nanoparticles
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/98362
https://ri.conicet.gov.ar/11336/11972
http://aip.scitation.org/doi/10.1063/1.4904349
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