IMPEDANCE CHARACTERISTICS OF HUMIDITY SENSING ELEMENTS ON V-DOPED TiO2

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  • TITLE: IMPEDANCE CHARACTERISTICS OF HUMIDITY SENSING ELEMENTS ON V-DOPED TiO2
  • AUTHOR(S): Zvezditza Nenova
  • ABSTRACT: This paper presents the results from the investigations of the impedance characteristics of humidity sensor elements based on V-doped TiO2, prepared via a sol-gel method. Measurements have been taken at relative humidity in the range of 17% to 93% at frequencies from 20 Hz to 5 MHz and temperature 25ºC. Using the ZView software package, Nyquist plots of the sensor elements have been obtained, and the relationship between these plots and the humidity sensing mechanism has been explained. A comparison with the impedance characteristics of TiO2-based reference elements without doping has been made, confirming the positive effect of V-doping on these characteristics. An equivalent electrical circuit of the humidity sensors investigated has been obtained, representing parallel connected resistance and capacitance.
  • PAGES: 109-
  • DOWNLOAD: IMPEDANCE CHARACTERISTICS OF HUMIDITY SENSING ELEMENTS ON V-DOPED TiO2