Journal
IEEE SENSORS JOURNAL
Volume 17, Issue 14, Pages 4349-4356Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2017.2711000
Keywords
Capacitive sensors; carbon dioxide; dielectric; fluoropolymers; gas sensors; P(VDF-HFP)
Funding
- Institute of Materials Research and Engineering [IMRE/13-3P1103]
- A*STAR [IMRE/13-3P1103]
- NXP Semiconductors [IMRE/13-3P1103]
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P(VDF-HFP) polymer is investigated through both theoretical and experimental approaches as a sensing material for capacitive CO2 sensor applications. Analysis based on the Clausius-Mossotti model shows that larger CO2 solubility and larger dielectric constant contribute to high CO2 capacitive sensitivity, which shows that P(VDF-HFP) polymer has significantly higher CO2 sensitivity compared with Teflon when they have comparable CO2 solubility, which is supported by subsequent experimental demonstration. Cross-sensitivity to humidity and temperature are evaluated and discussed for both P(VDF-HFP) and Teflon polymers. Fourier Transform Infrared spectroscopy (FTIR) analysis further reveals that the electrostatic interaction of P(VDF-HFP) with CO2 is stronger than Teflon. The theoretical analyses and experimental demonstration indicate that P(VDF-HFP) is a promising sensing material to be applied for capacitive CO2 sensors operated at room temperature.
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