Microwave-based sensors for exhaled acetone and ethanol detection

In this paper, the microwave-based gas sensors were tested as a potentially sensors in portable breath analyzers for monitoring biomarkers in exhaled breath, such as: acetone and ethanol. The obtained sensor's response was approximately 14 MHz/ppm for acetone and 3 MHz/ppm for ethanol. The comb copolymer phthalocyanine thin films were deposited as a sensitive layer. Fabricated sensors have been also verified under exposure to other volatile organic compounds, such as: methanol, butanol. The obtained results showed that microwave-based gas senors can be applied for acetone measurements.