A new attempt on reduction of ultrafine oxide particles

H. Suzuki, T. Tanigaki, T. Sato, O. Kido, Y. Atou, Y. Kimura, C. Kaito

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


A method to coat the surface of ultrafine particles by an amorphous carbon layer was developed and a characteristic reduction of the ultrafine particles has been observed for WO3 ultrafine particles. The carbon layer formation and the reduction process have been observed in situ in a transmission electron microscope. The growth of the carbon layer predominately occurred upon heating at 200°C by using a heating stage. The characteristic graphitization of the carbon layer took place at about 400°C. The characteristic gap formation at the interface of the carbon layer and WO3 particles started at about 400°C. The reduction indicates that a reaction between O and C atoms occurred and CO or CO2 gas evaporated into vacuum during the observation. The WO3 particles with the gap between carbon layers were also reduced.

Original languageEnglish
Pages (from-to)99-106
Number of pages8
JournalPhysics of Low-Dimensional Structures
Publication statusPublished - 2002 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)


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