Gas sensing characteristics and porosity control of nanostructured films composed of TiO2 nanotubes

Min Hyun Seo, Masayoshi Yuasa, Tetsuya Kida, Jeung Soo Huh, Kengo Shimanoe, Noboru Yamazoe

研究成果: Contribution to journalArticle査読

226 被引用数 (Scopus)

抄録

Preparation and morphology control of TiO2 nanostructured films for gas sensor applications were investigated. To examine the effect of the morphology of sensing films on the sensing characteristics, TiO2 with different morphologies, nanoparticles and nanotubes, were used for the film preparation. TiO2 nanotubes were prepared by a hydrothermal treatment of TiO2 nanoparticles in a NaOH solution at 160, 200, and 230 °C for 24 h and subsequent washing with an HCl solution. Uniform sized TiO2 nanotubes of 1 μm in length and 50 nm in diameter were formed at 230 °C. The sensing films composed of nanotubes prepared at 230 °C showed a high sensor response to toluene at 500 °C as compared with those composed of TiO2 nanoparticles. Scanning electron microscope (SEM) analysis and pore size distribution measurements indicated that the sensing films composed of the TiO2 nanotubes had a high porous morphology with a peak pore size of around 200 nm, which can promote the diffusion of toluene deep inside the films and improve the sensor response. The obtained results demonstrated the importance of microstructure control of sensing layers for improving the sensitivity to large size molecules like volatile organic compounds (VOCs).

本文言語英語
ページ(範囲)513-520
ページ数8
ジャーナルSensors and Actuators, B: Chemical
137
2
DOI
出版ステータス出版済み - 4 2 2009

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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