Effects of crystallite size and donor density on the sensor response of SnO 2 nano-particles in the state of volume depletion

Koichi Suematsu, Masayoshi Yuasa, Tetsuya Kida, Noboru Yamazoe, Kengo Shimanoe

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Abstract

To verify theoretical model based on the surface depletion effect of oxide semiconductor in small crystallite, the SnO 2 particles of different crystallite size and donor density were prepared by controlling heat-treatment temperature and Fe 3+ doping concentration, respectively. In addition, Fe 3+-doped SnO 2 was compared with Fe 2O 3-loaded SnO 2 to discuss the effect of donor density. The electrical resistance and sensor response of prepared SnO 2 films were measured in various partial pressures of oxygen and hydrogen. As results, both undoped-and Fe 3+-doped SnO 2 showed the volume depletion in the oxygen concentration of more than 2.5% at 350°C. The dependence of electrical resistance on oxygen partial pressure for smaller crystallite had steeper slope. Furthermore Fe 3+-doping improved the sensor response to hydrogen, while the Fe 2O 3-loading did not work. Good agreement between experimental data the volume depletion theory was found.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume159
Issue number4
DOIs
Publication statusPublished - Feb 29 2012

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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