Journal of Materials Science

, Volume 32, Issue 11, pp 2991–2996 | Cite as

Fabrication of a CuO-infiltrated ZnO composite and its gas sensing properties

  • Gakuji Uozumi
  • Masaru Miyayama
  • Hiroaki Yanagida


CuO–ZnO composites were fabricated by heating with infiltrating a cupric solution into a porous ZnO matrix. The composites possess a nonlinear, rectifying current–voltage character due to the presence of a p–n junction produced by the CuO and ZnO semiconductors. This junction is essential for the creation of voltage-dependent sensing properties of humidity and flammable gases. The forward current (CuO: positive bias) greatly increased with increasing the relative humidity, while the reverse current only slightly increased with an equivalent increase in the relative humidity. This asymmetric current change with the humidity is similar to that observed for conventional CuO and ZnO sintered specimens heterocontact produced by mechanically pressing the specimens together. The current was increased by the introduction of CO and H2 (4000 p.p.m.) at 250°C, with the current increase due to CO exceeding that of the H2 in the measured bias region within ±6 V. The utility of the new processing method for forming p–n semiconductor junctions open to the atmosphere has been shown.


Forward Bias Forward Current Humidity Dependence Cupric Hydroxide Average Relative Density 
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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • Gakuji Uozumi
    • 1
  • Masaru Miyayama
    • 2
  • Hiroaki Yanagida
  1. 1.Research Center for Advanced Science and TechnologyThe University of TokyoMeguro-ku TokyoJapan
  2. 2.Department of Applied Chemistry, Faculty of EngineeringThe University of TokyoBunkyo-ku TokyoJapan

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