Abstract
Lactic acid in liquids is generally detected by electrochemical sensors. In this research, for the first time, a gas sensor is reported which is sensitive to the lactic acid vapor. This polypyrrole-based polymer gas sensor is fabricated using the chemical polymerization method and the sensitivity of the sensor is evaluated at five different concentration levels in the range of 2%–10%. It is presented that the corresponding calibration curve is linear in this range. Moreover, the repeatability of the sensor response is investigated by carrying out several experiments at a constant concentration. Analyte examination of the proposed sensor is performed by exposing ammonia and lactic acid vapor and due to high selectivity of the sensor, its resistance changes at different directions. Unlike to reducing gas such as NH3, the sensor resistance increases at lactic acid exposure. This single-sensor gas device is prone to be applied as a potential electronic nose for sweat recognition usages.
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