Formation and coalescence of tungsten nanoparticles under electron beam irradiation

Yoshitaka Tamou, Shun ichiro Tanaka

Research output: Contribution to journalConference articlepeer-review

29 Citations (Scopus)


Powder particles of tungsten oxide (WO3) were irradiated by an electron beam with an energy of 200 keV in a transmission electron microscope (TEM) at room temperature. A number of nanocrystals were induced inside the single crystal particle as a result of irradiation damage. Electron energy loss spectroscopy (EELS) analysis revealed a decrease in the oxygen content in the particle which suggested decomposition of the tungsten oxide. In the vicinity of the irradiated area, a number of spherical ultrafine particles of 2-6 nm in diameter were observed. It is revealed that these ultrafine particles are oxide free tungsten. These nanoparticles migrated under the subsequent electron beam irradiation. A few nanoparticles which came into contact were observed to coalesce each other to form a single crystal. The mobility of the atoms was enhanced by the electron beam irradiation under ultrahigh vacuum in a TEM.

Original languageEnglish
Pages (from-to)123-126
Number of pages4
JournalNanostructured Materials
Issue number1
Publication statusPublished - 1999
Externally publishedYes
EventProceedings of the 1998 4th International Conference on Nanostructured Materials (NANO '98) - Stockholm, Swed
Duration: 1998 Jun 141998 Jun 19

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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