Preparation of size and habit-controlled nano crystallites of tungsten oxide

Yong Gyu Choi, Go Sakai, Kengo Shimanoe, Yasutake Teraoka, Norio Miura, Noboru Yamazoe

研究成果: Contribution to journalConference article査読

36 被引用数 (Scopus)

抄録

An aqueous sol dispersing nano crystallites of WO3·2H2O was subjected to a centrifugal treatment for 1 or 10 h, to obtain two kinds of WO3·2H2O gels with very different morphology of crystals. The WO3 thick film devices fabricated with these gels were investigated for several properties including NO2 sensing characteristics. It was found that the devices prepared under proper conditions exhibited excellent NO2 sensing properties to cover environmental standard of NO2. The sensitivity to NO2 as well as the rate of response depended markedly on calcination temperature of the devices. The morphology of WO3 crystals, i.e. lamellae or disks, was almost the same as that of WO3·2H2O gel unless calcination temperature exceeded 500 °C. Based on the surface analysis using N2 adsorption technique, the above changes were estimated to result from a change in microstructure of the WO3 crystals.

本文言語英語
ページ(範囲)486-494
ページ数9
ジャーナルSensors and Actuators, B: Chemical
93
1-3
DOI
出版ステータス出版済み - 8 1 2003
イベントProceedings of the Ninth International Meeting on Chemical Engineering - Boston, MA, 米国
継続期間: 7 7 20037 10 2003

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 器械工学
  • 凝縮系物理学
  • 表面、皮膜および薄膜
  • 金属および合金
  • 電子工学および電気工学
  • 材料化学

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