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Title: Importance of ion bombardment during coverage of Au nanoparticles on their structural features and optical response

This work studies the changes in the optical response and morphological features of 6 ± 1 nm diameter Au nanoparticles (NPs) when covered by a layer of a-Al{sub 2}O{sub 3} by pulsed laser deposition (PLD). The laser fluence used for ablating the Al{sub 2}O{sub 3} target is varied in order to modify the kinetic energy (KE) of the species bombarding the NPs during their coverage. When the ion KE < 200 eV, the structural features and optical properties of the NPs are close to those of uncovered ones. Otherwise, a shift to the blue and a strong damping of the surface plasmon resonance is observed as fluence is increased. There are two processes responsible for these changes, both related to aluminum ions arriving to the substrate during the coverage process, i.e., sputtering of the metal and implantation of aluminum species in the metal. Both processes have been simulated using standard models for ion bombardment, the calculated effective implanted depths allow explaining the observed changes in the optical response, and the use of a size-dependent sputtering coefficient for the Au NPs predicts the experimental sputtering fractions. In spite of the work is based on PLD, the concepts investigated and conclusions can straightforwardly be extrapolated to other physicalmore » vapor deposition techniques or processes involving ion bombardment of metal NPs by ions having KE > 200 eV.« less
Authors:
; ;  [1]
  1. Laser Processing Group, Instituto de Óptica, CSIC, Serrano 121, E-28006 Madrid (Spain)
Publication Date:
OSTI Identifier:
22271174
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALUMINIUM; ALUMINIUM IONS; ALUMINIUM OXIDES; COMPUTERIZED SIMULATION; ENERGY BEAM DEPOSITION; GOLD; ION BEAMS; LASER RADIATION; LAYERS; NANOSTRUCTURES; OPTICAL PROPERTIES; PARTICLE SIZE; PARTICLES; PHYSICAL VAPOR DEPOSITION; PULSED IRRADIATION; SPUTTERING; SUBSTRATES; SURFACES