Size-dependent complex dielectric function of Ni, Mo, W, Pb, Zn and Na nanoparticles. application to sizing
David Muñetón Arboleda, Jesica M. J. Santillán, Luis J. Mendoza Herrera, Diego Muraca, Daniel C. Schinca and Lucía B. Scaffardi
ARTIGO
Inglês
Agradecimentos: This work was granted by PIP 0280 (CONICET) and 11/I151 (Facultad de Ingeniería, UNLP). We thank C2NANO-Brazilian Nanotechnology National Laboratory (LNNano) at Centro Nacional de Pesquisa em Energia e Materiais (CNPEM)/MCT (#14825 and 14827) and Research Proposal TEM-16976 for the...
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Agradecimentos: This work was granted by PIP 0280 (CONICET) and 11/I151 (Facultad de Ingeniería, UNLP). We thank C2NANO-Brazilian Nanotechnology National Laboratory (LNNano) at Centro Nacional de Pesquisa em Energia e Materiais (CNPEM)/MCT (#14825 and 14827) and Research Proposal TEM-16976 for the use of TEM. D. C. Schinca is Member of Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC). L B. Scaffardi and J M J Santillán are researchers of CONICET. D Muraca is Member of Instituto de Física 'GlebWataghin' (IFGW), Campinas, Brazil. D Muñetón Arboleda and L J Mendoza Herrera are PhD fellows of CONICET, Argentina
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Abstract: This work determines the size dependent metal nanoparticle (NP) dielectric function from a 'top-down' approach using the bulk experimental refractive index as a starting point. Free-electron damping constant (gamma(free)) and plasma frequency (omega(p)) parameters in the Drude model are...
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Abstract: This work determines the size dependent metal nanoparticle (NP) dielectric function from a 'top-down' approach using the bulk experimental refractive index as a starting point. Free-electron damping constant (gamma(free)) and plasma frequency (omega(p)) parameters in the Drude model are calculated for nickel (Ni), molybdenum (Mo), tungsten (W), lead (Pb), zinc (Zn) and sodium (Na) using a method developed in our group. Determined gamma(free) and omega(p) parameters allow to develop an expression that improves the precision in reproducing the discrete metal bulk dielectric function in a wide wavelength range (UV-FIR). The bulk dielectric function is modified for describing the nanometric case by adding size corrective terms for free and bound electrons contributions. As an application of this study we characterize Ni spherical NPs synthesized by ultrafast laser ablation of a solid target in water. Using Mie theory together with the size-dependent dielectric function, we theoretically reproduce its experimental extinction spectrum. From this fitting, composition and size distribution of the particles in the colloidal suspension may be derived. Transmission electron microscopy (TEM) results agree with the sizes and structure derived from optical extinction spectroscopy (OES)
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Aberto
Muraca, Diego, 1978-
Autor
Size-dependent complex dielectric function of Ni, Mo, W, Pb, Zn and Na nanoparticles. application to sizing
David Muñetón Arboleda, Jesica M. J. Santillán, Luis J. Mendoza Herrera, Diego Muraca, Daniel C. Schinca and Lucía B. Scaffardi
Size-dependent complex dielectric function of Ni, Mo, W, Pb, Zn and Na nanoparticles. application to sizing
David Muñetón Arboleda, Jesica M. J. Santillán, Luis J. Mendoza Herrera, Diego Muraca, Daniel C. Schinca and Lucía B. Scaffardi
Fontes
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Journal of physics. D, Applied physics Vol. 49, n. 7 (Feb., 2016), n. art. 075302, p. 1-10 |