The SnO2 films deposited from inorganic precursors via sol-gel dip coating
method have been found to be highly sensitive to ethanol vapor. An average
sensitivity as high as ca. 240 obtained in the films, has been attributed t
o their nano-crystalline nature as revealed by Glancing angle X-ray diffrac
tion (GAXRD) and Atomic force microscope (AFM). The sensitivity was linear
in the low concentration range. The films showed fast response and recovery
times. The dependence of grain size of the films on the nature of the subs
trate and the associated effect on sensitivity has been investigated. (C) 1
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