Effect of convection gas on the synthesis of nanophase tin oxides during a gas condensation method

Jae Pyoung Ahn, Jong Ku Park, Byoung Kee Kim, Moo Young Huh

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Tin oxide powders of nanometer size have been synthesized by a gas condensation method using helium or a mixture of oxygen and helium as the convection gas. Changes in the average size, morphology, and crystal phases were investigated during heat treatment at temperatures between 350°C and 720°C in the air. Spherical tin oxide powders of 15 nm in average diameter were synthesized in a helium atmosphere, which was composed of Sn, SnO, and Sn2O3, phases. After annealing at 720°C, these multiphase particles transformed to a single SnO2 phase and became an irregular shape of about 50 nm in diameter. This rapid coarsening was attributed to fast mass transfer among particles. The spherical SnO2 powder of 7 nm in average diameter was directly synthesized using a gas mixture of oxygen and helium. Upon annealing up to 720°C, morphological changes were barely observed in the powder synthesized using a convection atmosphere containing oxygen.

Original languageEnglish
Pages (from-to)188-192
Number of pages5
JournalMetals and Materials International
Volume3
Issue number3
DOIs
Publication statusPublished - 1997

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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