Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures

We report for the first time on the formation of self-assembled fractals of spherical Ag nanoparticles (Nps) fabricated by femtosecond pulse laser ablation of a solid silver target in water. Fractal structures grew both in two and three Euclidean dimensions (d). Ramified-fractal assemblies of 2 nm h...

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Autores principales:	Santillán, Jesica María José, Fernández van Raap, Marcela Beatriz, Mendoza Zélis, Pedro, Coral Coral, Diego Fernando, Muraca, Diego, Schinca, Daniel Carlos, Scaffardi, Lucía Beatriz
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2015
Materias:	Física Fractal Silver nanoparticles Fs laser ablation SAXS AFM
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/132573
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-132573
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Física Fractal Silver nanoparticles Fs laser ablation SAXS AFM
spellingShingle	Física Fractal Silver nanoparticles Fs laser ablation SAXS AFM Santillán, Jesica María José Fernández van Raap, Marcela Beatriz Mendoza Zélis, Pedro Coral Coral, Diego Fernando Muraca, Diego Schinca, Daniel Carlos Scaffardi, Lucía Beatriz Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures
topic_facet	Física Fractal Silver nanoparticles Fs laser ablation SAXS AFM
description	We report for the first time on the formation of self-assembled fractals of spherical Ag nanoparticles (Nps) fabricated by femtosecond pulse laser ablation of a solid silver target in water. Fractal structures grew both in two and three Euclidean dimensions (d). Ramified-fractal assemblies of 2 nm height and 5–14 μm large, decorated with Ag Nps of 3 nm size, were obtained in a 2d geometry when highly diluted drops of colloidal suspension were dried at a fast heating rate over a mica substrate. When less-diluted drops were dried at slow heating rate, isolated single Nps or rosette-like structures were formed. Fractal aggregates about 31 nm size in 3d geometry were observed in the as-prepared colloidal suspension. Electron diffraction and optical extinction spectroscopy (OES) analyses performed on the samples confirmed the presence of Ag and Ag2O. The analysis of the optical extinction spectrum, using the electrostatic approximation of Mie theory for small spheres, showed the existence of Ag bare core, Ag–Ag2O and air–Ag core–shell Nps, Ag–Ag2O being the most frequent type [69 % relative abundance (r.a.)]. Core-size and shell-thickness distribution was derived from OES. In situ scattering measurements of the Ag colloidal suspension, carried out by small-angle X-ray scattering, indicate a mass fractal composed of packaged 〈D; SAXS〉 = (5 ± 1) nm particles and fractal dimension d; f = 2.5. Ex situ atomic force microscopy imaging displayed well-ramified structures, which, analyzed with box-counting method, yield a fractal dimension d; f = 1.67. The growing behavior of these 2d and 3d self-assembled fractals is consistent with the diffusion-limited aggregation model.
format	Articulo Articulo
author	Santillán, Jesica María José Fernández van Raap, Marcela Beatriz Mendoza Zélis, Pedro Coral Coral, Diego Fernando Muraca, Diego Schinca, Daniel Carlos Scaffardi, Lucía Beatriz
author_facet	Santillán, Jesica María José Fernández van Raap, Marcela Beatriz Mendoza Zélis, Pedro Coral Coral, Diego Fernando Muraca, Diego Schinca, Daniel Carlos Scaffardi, Lucía Beatriz
author_sort	Santillán, Jesica María José
title	Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures
title_short	Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures
title_full	Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures
title_fullStr	Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures
title_full_unstemmed	Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures
title_sort	ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures
publishDate	2015
url	http://sedici.unlp.edu.ar/handle/10915/132573
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bdutipo_str	Repositorios
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Ag nanoparticles formed by femtosecond pulse laser ablation in water: self-assembled fractal structures

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