Simultaneous measurement of electrical conductivity and the amount of adsorbed oxygen in porous ZnO.

DOI PDF 被引用文献3件 参考文献15件
  • Fujitsu Satoru
    Department of Industrial Chemistry, Faculty of Engineering, University of Tokyo
  • Toyoda Hiroshi
    Department of Industrial Chemistry, Faculty of Engineering, University of Tokyo
  • Koumoto Kunihito
    Department of Industrial Chemistry, Faculty of Engineering, University of Tokyo
  • Yanagida Hiroaki
    Research Center for Advanced Science and Technology, University of Tokyo
  • Chikazawa Masatoshi
    Department of Industrial Chemistry,Faculty of Technology, Tokyo Metropolitan University
  • Kanazawa Takafumi
    Department of Industrial Chemistry,Faculty of Technology, Tokyo Metropolitan University

抄録

Changes in electrical conductivity and the amount of adsorbed oxygen in porous ZnO were measured simultaneously in the temperature range of 200–600 °C. The saturated amount of adsorbed oxygen increased initially, went through a maximum at 500 °C, and then decreased with increasing temperature. The conductivity decreased exponentially with increase in the amount of adsorbed oxygen, which indicates that the energy barrier formed due to the chemisorbed oxygen controls the total conductivity. In a high temperature region, not only the chemisorbed oxygen, but also the oxygen diffused into the grain boundaries played important roles in changing the electrical conductivity. The diffused oxygen was examined by means of a depth profile of tracer 18O measured by SIMS. The formation of the energy barrier at the grain boundary was confirmed by current-voltage characteristic measurements.

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