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A polymer-absorption chemical gas sensor has been microfabricated and tested to discriminate varying concentrations of ethanol vapors. The polymer, PEDOT (3,4- polyethylenedioxythiopene-polystyrenesulfonate) was combined with carbon to function as the sensing device. The sensor demonstrated well-defined responses to the smallest tested ethanol concentrations of 0.1 μl (185 ppm) and is expected to be accurate to much smaller ppm levels. When packed with the proposed external feedback network, the device may be suitable for field-breath alcohol level detection as an alternative to expensive fuel-cell and chromatography based devices. The proposed device will be portable, user friendly and inexpensive to operate.

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