Nanoscale Dielectric Function of Fe, Pt, Ti, Ta, Al, and V: Application to Characterization of Al Nanoparticles Synthesized by Fs Laser Ablation

Development and applications of new nanomaterials and nanocomposites that include metal nanoparticles have received much attention in the last years. However, there are relatively few studies concerning basic physical characteristics of the dielectric function at the nanoscale, which is needed for p...

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Autores principales: Mendoza Herrera, Luis Joaquín, Muñetón Arboleda, David, Santillán, Jesica María José, Fernández van Raap, Marcela Beatriz, Scaffardi, Lucía Beatriz, Schinca, Daniel Carlos
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Física
Metal nanoparticles
Dielectric function
Plasmon resonance
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/143006
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-143006
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Metal nanoparticles
Dielectric function
Plasmon resonance
spellingShingle Física
Metal nanoparticles
Dielectric function
Plasmon resonance
Mendoza Herrera, Luis Joaquín
Muñetón Arboleda, David
Santillán, Jesica María José
Fernández van Raap, Marcela Beatriz
Scaffardi, Lucía Beatriz
Schinca, Daniel Carlos
Nanoscale Dielectric Function of Fe, Pt, Ti, Ta, Al, and V: Application to Characterization of Al Nanoparticles Synthesized by Fs Laser Ablation
topic_facet Física
Metal nanoparticles
Dielectric function
Plasmon resonance
description Development and applications of new nanomaterials and nanocomposites that include metal nanoparticles have received much attention in the last years. However, there are relatively few studies concerning basic physical characteristics of the dielectric function at the nanoscale, which is needed for predicting their optical and plasmonic response. The size-dependent complex dielectric function of metal Fe, Pt, Ti, Ta, Al, and V nanoparticles (NPs) is calculated for the first time for an extended wavelength range from UV to FIR, based on experimental bulk complex refractive index measurements in the mentioned range at room temperature. Calculation is based on a “top-down” approach, based on a stepwise modification of the Drude model. Bulk plasma frequency (ω; p) and damping constant (γ; free) in this model are determined using a method that improves the relative uncertainties in their values and provide an insight about the wavelength range over which the metal may be considered Drude like. Validation of ω; p and γ; free values is demonstrated by the improved accuracy with which the experimental bulk dielectric function is reproduced. For nanometric and subnanometric scales, dielectric function is made size dependent considering size-corrective terms for free and bound electron contributions to the bulk dielectric function. These results are applied to analyze the synthesis of Al NP suspensions using a 120-fs pulse laser to ablate an Al solid target in n-heptane and water. The presence of Al, Al-Al2O3, and air-Al core-shell structures is also reported for the first time in these type of colloids. Analysis of the structure, configuration, sizing, and relative abundance was carried out using optical extinction spectroscopy (OES). Sizing results are compared with those provided by atomic force microscopy (AFM) studies.
format Articulo
Articulo
author Mendoza Herrera, Luis Joaquín
Muñetón Arboleda, David
Santillán, Jesica María José
Fernández van Raap, Marcela Beatriz
Scaffardi, Lucía Beatriz
Schinca, Daniel Carlos
author_facet Mendoza Herrera, Luis Joaquín
Muñetón Arboleda, David
Santillán, Jesica María José
Fernández van Raap, Marcela Beatriz
Scaffardi, Lucía Beatriz
Schinca, Daniel Carlos
author_sort Mendoza Herrera, Luis Joaquín
title Nanoscale Dielectric Function of Fe, Pt, Ti, Ta, Al, and V: Application to Characterization of Al Nanoparticles Synthesized by Fs Laser Ablation
title_short Nanoscale Dielectric Function of Fe, Pt, Ti, Ta, Al, and V: Application to Characterization of Al Nanoparticles Synthesized by Fs Laser Ablation
title_full Nanoscale Dielectric Function of Fe, Pt, Ti, Ta, Al, and V: Application to Characterization of Al Nanoparticles Synthesized by Fs Laser Ablation
title_fullStr Nanoscale Dielectric Function of Fe, Pt, Ti, Ta, Al, and V: Application to Characterization of Al Nanoparticles Synthesized by Fs Laser Ablation
title_full_unstemmed Nanoscale Dielectric Function of Fe, Pt, Ti, Ta, Al, and V: Application to Characterization of Al Nanoparticles Synthesized by Fs Laser Ablation
title_sort nanoscale dielectric function of fe, pt, ti, ta, al, and v: application to characterization of al nanoparticles synthesized by fs laser ablation
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/143006
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