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.
|Number of pages||4|
|Publication status||Published - 1999|
|Event||Proceedings of the 1998 4th International Conference on Nanostructured Materials (NANO '98) - Stockholm, Swed|
Duration: 1998 Jun 14 → 1998 Jun 19
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics