Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Understanding the ion-induced elongation of silver nanoparticles embedded in silica
Year:2017
Research Areas
  • Nanomaterials,
  • Description,
  • Synthesis,
  • Interaction mechanisms,
  • Optical properties,
  • Engineering
Information
Abstract
The shape deformation (elongation) of metallic nanoparticles (NPs) embedded in a dielectric matrix produced by irradiation with swift heavy ions is a phenomenon that has been known for many years. The rods obtained in this way have their long axis aligned with the incident ion beam direction, which can be advantageous for many applications. The physics involved in the sphere-to-rod transformation has been extensively studied and some phenomenological models exist, but it is not yet fully understood. One of the reasons that complicate this task is the lack of information concerning the intermediate stages of the deformation mechanism. In this work we have studied the elongation of silver nanoparticles irradiated with 40 MeV Bromine ions by means of in situ optical measurements, transmission electron microscopy and molecular dynamics simulations. The localized surface plasmon resonance of silver nanoparticles has a strong dependence on the particle shape and size, which allowed us to obtain the geometrical parameters with remarkable accuracy by means of a fit of the optical spectra. Optical results have been compared with transmission electron microscopy images and molecular dynamics simulations and the agreement is excellent in both cases. An important advantage of in situ measurements is that they yield an extremely detailed information of the full elongation kinetics. Final NP elongation depends on a complex competition between single-ion deformation, Ostwald ripening and dissolution. Building and validating theoretical models with the data reported in this work should be easier than with the information previously available, due to the unprecedented level of kinetic details obtained from the in situ measurements.
International
Si
Congress
19th International Conference on Radiation Effects in Insulators (REI 19)
960
Place
Versalles (Francia)
Reviewers
Si
ISBN/ISSN
0000-0000
Start Date
02/07/2017
End Date
07/07/2017
From page
0
To page
0
Proceedings
Participants
  • Autor: Ovidio Yordanis Peña Rodriguez (UPM)
  • Autor: Alejandro Prada Valverde (UPM)
  • Autor: José Olivares (Centro de Micro-Análisis de Materiales (CMAM-UAM) y Instituto de Óptica (CSIC))
  • Autor: Alicia Oliver (Instituto de Física (UNAM))
  • Autor: Luis Rodríguez Fernández (Instituto de Física (UNAM))
  • Autor: Eduardo Bringa (CONICET y Facultad de Ciencias Exactas y Naturales (UNCuyo))
  • Autor: Jose Manuel Perlado Martin (UPM)
  • Autor: Antonio Juan Rivera de Mena (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Fusión Nuclear Inercial y Tecnología de fusión
  • Centro o Instituto I+D+i: Instituto de Fusión Nuclear
S2i 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)