Mechanism of elongation of gold or silver nanoparticles in silica by irradiation with swift heavy ions

Koichi Awazu, Xiamin Wang, Makoto Fujimaki, Junji Tominaga, Shinji Fujii, Hirohiko Aiba, Yoshimichi Ohki, Tetsuro Komatsubara

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

It has been reported that elongated Au nanoparticles oriented parallel to one another can be synthesized in SiO2 by ion irradiation. Our aim was to elucidate the mechanism of this elongation. We prepared Au and Ag nanoparticles with a diameter of 20 nm in an SiO2 matrix. It was found that Au nanoparticles showed greater elongated with a higher flux of ion beam and with thicker SiO2 films. In contrast, Ag nanoparticles split into two or more shorter nanorods aligned end to end in the direction parallel to the ion beam. These experimental results are discussed in the framework of a thermal spike model of Au and Ag nanorods embedded in SiO2. The lattice temperature exceeds the melting temperatures of SiO2, Au and Ag for 100 ns after one 110 MeV Br10+ ion has passed through the middle of an Au or Ag nanorod. Crown

Original languageEnglish
Pages (from-to)941-943
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume267
Issue number6
DOIs
Publication statusPublished - 2009 Mar 1

Keywords

  • Au nanoparticles
  • Nanofabrication
  • Silica glass
  • Swift heavy ion

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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