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Optical extinction for determining the size distribution of gold nanoparticles fabricated by ultra-short pulsed laser ablation

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Abstract

This work presents a method, based on measurements of the optical extinction spectra, to determine the size of spherical gold nanoparticles produced using the 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 certain size distribution. Additionally, in order to obtain complementary measurements of the size distribution, TEM analysis was performed. The results obtained showed that the predominant nanoparticle size distribution ranges from 1 to 11 nm in terms of radii. An 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.

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Authors and Affiliations

  1. Centro de Investigaciones Ópticas (CIOp), Casilla de Correo 124, 1900, La Plata, Argentina

    G. A. Torchia, L. B. Scaffardi & J. O. Tocho

  2. Servicio Láser, Universidad de Salamanca, Plaza de la Merced s/n, 37008, Salamanca, Spain

    G. A. Torchia, C. Méndez, P. Moreno & L. Roso

  3. Departamento de Ciencias Básicas, Facultad de Ingeniería, Universidad Nacional La Plata, La Plata, Argentina

    L. B. Scaffardi

  4. Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Argentina

    J. O. Tocho

Authors
  1. G. A. Torchia
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  2. L. B. Scaffardi
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  3. C. Méndez
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  4. P. Moreno
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  5. J. O. Tocho
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  6. L. Roso
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Correspondence to G. A. Torchia.

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Torchia, G.A., Scaffardi, L.B., Méndez, C. et al. Optical extinction for determining the size distribution of gold nanoparticles fabricated by ultra-short pulsed laser ablation. Appl. Phys. A 93, 967–971 (2008). https://doi.org/10.1007/s00339-008-4761-2

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  • DOI: https://doi.org/10.1007/s00339-008-4761-2

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