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Title: Ion beam irradiation of embedded nanoparticles: Toward an in situ control of size and spatial distribution

Abstract

Irradiation of chemically synthesized Au nanoparticles embedded in a dielectric matrix promotes the formation of a halo of satellites around the original cluster. We show that the complete dissolution of the nanoparticles (NC) results in the formation of a narrow size distribution of small precipitates with a mean size of 2 nm and a standard deviation of 0.4 nm. By combining the chemical synthesis of the nanoparticles and the irradiation to induce their dissolution and precipitation, we give a guideline method for overcoming the difficulty of controlling the size and spatial distribution of the embedded NC associated with ion implantation technique. In particular, we showed that the irradiation can be used to tailor the size of the already formed NC. Moreover, we establish that the satellites cluster evolution under irradiation can be described by a two step process. These two steps are discussed in terms of classical and inverse Ostwald ripening mechanisms.

Authors:
; ; ; ;  [1];  [2];  [2]
  1. Laboratoire des Solides Irradies, Ecole Polytechnique/CEA-DRECAM/CNRS, 91128 Palaiseau Cedex (France)
  2. (France)
Publication Date:
OSTI Identifier:
20884977
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 1; Other Information: DOI: 10.1063/1.2402351; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DIELECTRIC MATERIALS; DISSOLUTION; GOLD; ION BEAMS; ION IMPLANTATION; IRRADIATION; NANOSTRUCTURES; PARTICLES; PRECIPITATION; SPATIAL DISTRIBUTION

Citation Formats

Rizza, G., Cheverry, H., Gacoin, T., Lamasson, A., Henry, S., Groupe de Chimie du Solide, Laboratoire de Physique de la Matiere Condensee, UMR CNRS 7643, Ecole Polytechnique, 91128 Palaiseau, and Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, CNRS-IN2P3, Ba circumflex t 108, 91405 Orsay, Campus. Ion beam irradiation of embedded nanoparticles: Toward an in situ control of size and spatial distribution. United States: N. p., 2007. Web. doi:10.1063/1.2402351.
Rizza, G., Cheverry, H., Gacoin, T., Lamasson, A., Henry, S., Groupe de Chimie du Solide, Laboratoire de Physique de la Matiere Condensee, UMR CNRS 7643, Ecole Polytechnique, 91128 Palaiseau, & Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, CNRS-IN2P3, Ba circumflex t 108, 91405 Orsay, Campus. Ion beam irradiation of embedded nanoparticles: Toward an in situ control of size and spatial distribution. United States. doi:10.1063/1.2402351.
Rizza, G., Cheverry, H., Gacoin, T., Lamasson, A., Henry, S., Groupe de Chimie du Solide, Laboratoire de Physique de la Matiere Condensee, UMR CNRS 7643, Ecole Polytechnique, 91128 Palaiseau, and Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, CNRS-IN2P3, Ba circumflex t 108, 91405 Orsay, Campus. Mon . "Ion beam irradiation of embedded nanoparticles: Toward an in situ control of size and spatial distribution". United States. doi:10.1063/1.2402351.
@article{osti_20884977,
title = {Ion beam irradiation of embedded nanoparticles: Toward an in situ control of size and spatial distribution},
author = {Rizza, G. and Cheverry, H. and Gacoin, T. and Lamasson, A. and Henry, S. and Groupe de Chimie du Solide, Laboratoire de Physique de la Matiere Condensee, UMR CNRS 7643, Ecole Polytechnique, 91128 Palaiseau and Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, CNRS-IN2P3, Ba circumflex t 108, 91405 Orsay, Campus},
abstractNote = {Irradiation of chemically synthesized Au nanoparticles embedded in a dielectric matrix promotes the formation of a halo of satellites around the original cluster. We show that the complete dissolution of the nanoparticles (NC) results in the formation of a narrow size distribution of small precipitates with a mean size of 2 nm and a standard deviation of 0.4 nm. By combining the chemical synthesis of the nanoparticles and the irradiation to induce their dissolution and precipitation, we give a guideline method for overcoming the difficulty of controlling the size and spatial distribution of the embedded NC associated with ion implantation technique. In particular, we showed that the irradiation can be used to tailor the size of the already formed NC. Moreover, we establish that the satellites cluster evolution under irradiation can be described by a two step process. These two steps are discussed in terms of classical and inverse Ostwald ripening mechanisms.},
doi = {10.1063/1.2402351},
journal = {Journal of Applied Physics},
number = 1,
volume = 101,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • Samples composted of chemically synthesized Au nanoparticles (NPs) (16.0{+-}2.0 nm) embedded within a planar silica film are used as model system to investigate the evolution of a second phase under irradiation when the temperature and the ion stopping power are changed. Samples are irradiated with 4 MeV Au{sup 2+} ions and 4 MeV Br{sup 2+} ions for temperature ranging from 30 deg. C up to 800 deg. C and for fluences up to 8x10{sup 16} cm{sup -2}. We show that at room temperature the complete dissolution of the NPs leads to the formation of smaller precipitates with a narrower sizemore » distribution, i.e., 2.0{+-}0.3 nm. However, when the temperature is increased and/or the nuclear stopping power is decreased, a reduction in the dissolution rate was observed. This leads to the formation of a bimodal size distribution. Finally, the evolution of the density of the precipitates with the temperature is discussed in term of the thermal stability of the irradiation-induced defects within the silica matrix.« less
  • Elemental Cu nanoparticles embedded in SiO{sub 2} were irradiated with 5 MeV Sn{sup 3+}. The nanoparticle structure was studied as a function of Sn{sup 3+} fluence by extended x-ray absorption fine structure spectroscopy, small-angle x-ray scattering, and transmission electron microscopy. Prior to irradiation, Cu nanoparticles exhibited the face-centered-cubic structure. Upon irradiation at intermediate fluences (1x10{sup 13} to 1x10{sup 14} ions/cm{sup 2}), the first nearest neighbor Cu-Cu coordination number decreased, while the Debye-Waller factor, bondlength, and third cumulant of the bondlength distribution increased. In particular, at a fluence of 1x10{sup 14} ions/cm{sup 2} we argue for the presence of an amorphousmore » Cu phase, for which we deduce the structural parameters. Low temperature annealing (insufficient for nanoparticle growth) of the amorphous Cu returned the nanoparticles to the initial preirradiation structure. At significantly higher irradiation fluences (1x10{sup 15} to 1x10{sup 16} ions/cm{sup 2}), the nanoparticles were dissolved in the matrix with a Cu coordination similar to that of Cu{sub 2}O.« less
  • ZnO nanoparticles (NPs) embedded in amorphous SiO{sub 2} were irradiated with 200 MeV Xe{sup 14+} swift heavy ions (SHIs) to a fluence of 5.0 × 10{sup 13} ions/cm{sup 2}. Optical linear dichroism was induced in the samples by the irradiation, indicating shape transformation of the NPs from spheres to anisotropic ones. Transmission electron microscopy observations revealed that some NPs were elongated to prolate shapes; the elongated NPs consisted not of ZnO but of Zn metal. The SHI irradiation induced deoxidation of small ZnO NPs and successive shape elongation of the deoxidized metal NPs.
  • The field emission (FE) properties of nickel nanoparticles embedded in thin silica matrix irradiated with 100 MeV Au{sup +7} ions at various fluences are studied here. A large increase in FE current density is observed in the irradiated films as compared to their as deposited counterpart. The dependence of FE properties on irradiation fluence is correlated with surface roughness, density of states of valence band and size distribution of nanoparticles as examined with atomic force microscope, X-ray photoelectron spectroscopy, and grazing incidence small angle x-ray scattering. A current density as high as 0.48 mA/cm{sup 2} at an applied field 15 V/μm has beenmore » found for the first time for planar field emitters in the film irradiated with fluence of 5.0 × 10{sup 13} ions/cm{sup 2}. This significant enhancement in the current density is attributed to an optimized size distribution along with highest surface roughness of the same. This new member of field emission family meets most of the requirements of cold cathodes for vacuum micro/nanoelectronic devices.« less