Abstract
Hectorite clay films deposited on interdigitated arrays undergo a change in AC impedance on exposure to water vapor in nitrogen. This impedance change appears to saturate at relative humidities of slightly greater than 10%. For this range of relative humidities, the clay film can act as a humidity sensor. The films do not respond to ethanol vapor; thus, the films may be used to detect the presence of water in ethanol. The response of the films to water vapor is rapid and reversible.
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