SCHEDULED MAINTENANCE
Optical recognition of CO and H2 by use of gas-sensitive Au–Co3O4 composite films
Abstract
Gold–cobalt oxide (Au–Co
3
O
4
)
composite films have been prepared by the sputter-deposition of gold onto
a glass plate substrate followed by pyrolysis of spin-coated cobalt
2-ethylhexanoate. The films comprise small Au particles and
Co
3
O
4
nanocrystals, and exhibit different and
independent optical responses to CO and H
2
in air. Carbon
monoxide caused only a decrease in absorbance, while H
2
caused
both a decrease and an increase in absorbance at different wavelengths.
Among solid-state gas sensor materials, this
Au–Co
3
O
4
composite film is probably the first
example of an inorganic material which can be used for the recognition of
CO and H
2
molecules through optical absorbance
changes.
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