Journal
IEEE SENSORS JOURNAL
Volume 15, Issue 1, Pages 248-254Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2014.2345477
Keywords
Microwave resonator; PDMS swelling; resonance frequency
Funding
- Canada Excellence Research Chairs Program
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A microwave (MW)-based sensing platform for detection of acetone vapor is demonstrated. The sensing platform comprises of an MW resonator coated with a thin layer of polydimethylsiloxane (PDMS) that acts as a sorbent layer for acetone. Absorption-induced swelling of PDMS changes the permittivity and results in reproducible variations in the resonance frequency of the resonator. Here, we demonstrate the detection of acetone, as the model analyte, with the concentrations of 0-265 ppt. In addition, since the technique is based on electromagnetic fields spilling into space, we show the ability of the sensor to detect acetone in a noncontact fashion.
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