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

✍ Scribed by Roberto Zanoni; Guido Righini; Angelo Montenero; Guglielmina Gnappi; Andrea Bearzotti; Giampiero Montesperelli; Enrico Traversa

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 354 KB
• Volume: 25
• Category: Article
• ISSN: 0925-4005
• DOI: 10.1016/0925-4005(95)85195-x

✦ Synopsis

X-ray photoelectron spectroscopy (XPS) results are presented on a series of alkali-doped and undoped TiO, films prepared by the sol-gel technique. TiOz films are deposited onto AIrOr and quartz substrates, using titanium isopropylalkoxide as the precursor, 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.