Copper and nickel doping effect on interaction of SnO2 films with H2S
Abstract
The pyrosol spraying deposition technique has been used for the
synthesis of SnO
2
, SnO
2
–CuO and
SnO
2
–NiO polycrystalline films with grain size of
3–10 nm. The composition, microstructure and electrical properties
of the films have been investigated by X-ray diffraction, electron probe
microanalysis, Auger electron spectroscopy and X-ray photoelectron
spectroscopy. The interaction of SnO
2
,
SnO
2
–CuO and SnO
2
–NiO polycrystalline
films with the reducing gases: H
2
S,
C
2
H
5
OH, CO and CH
4
has been investigated
by conductance measurements. It has been found that copper and nickel have
a significant effect on the sensitivity of SnO
2
films to
H
2
S. The model of interaction of SnO
2
films with
H
2
S gas and different sensor properties of tin dioxide films
doped with copper and nickel are discussed with regard to the position of
these metals in the films.
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