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

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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
Publication statusPublished - 1997 Dec 1

Fingerprint

Helium
Tin oxides
Powders
tin oxides
Condensation
convection
condensation
Gases
helium
synthesis
Oxygen
gases
oxygen
Annealing
atmospheres
annealing
Coarsening
Gas mixtures
mass transfer
gas mixtures

ASJC Scopus subject areas

  • Engineering(all)

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Effect of convection gas on the synthesis of nanophase tin oxides during a gas condensation method. / Ahn, Jae Pyoung; Park, Jong Ku; Kim, Byoung Kee; Huh, Moo Young.

In: Metals and Materials International, Vol. 3, No. 3, 01.12.1997, p. 188-192.

Research output: Contribution to journalArticle

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