Surface composition of alkali-dope TiO2 films for sensors investigated by XPS

Roberto Zanoni*, Guido Righini, Angelo Montenero, Guglielmina Gnappi, Andrea Bearzotti, Giampiero Montesperelli, Enrico Traversa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


X-ray photoelectron spectroscopy (XPS) results are presented on a series of alkali-doped and undoped TiO2 films prepared by the sol-gel technique. TiO2 films are deposited onto Al2O3 and quartz substrates, using titanium isopropylalkoxide as the prescursor, by dip-coating from the appropriate solutions. After dipping, the films are dried at 100 °C for one day and then heated to 300 °C for 30 min. The surface composition of the films is discussed, and the effects of Li, Na and K doping are compared. The effect of doping on the humidity-sensitive electrical properties of the films is evaluated by measuring the current flowing at various relative-humidity values upon application of a constant d.c. voltage.

Original languageEnglish (US)
Pages (from-to)886-888
Number of pages3
JournalSensors and Actuators: B. Chemical
Issue number1-3
StatePublished - Apr 1995
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the National Research Council of Italy (CNR), under the auspices of the Targeted Project ‘Special Materials for Advanced Technologies’.


  • Humidity sensors
  • Titania
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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