Lei Zhang, Mojtaba Rahimabady, Sze Yu Tan, Chin Yaw Tan, Shuting Chen, Yi Fan Chen, Kui Yao, Aurelie Humbert, Dimitri Soccol, Keyan Zang and Michael Bolt, “P(VDF-HFP) Polymer as Sensing Material for Capacitive Carbon Dioxide Sensors," IEEE Sensors Journal, Vol. 17, No. 14, pp. 4349-4356, 15 Jul 2017. (DOI: 10.1109/JSEN.2017.2711000).
Abstract:
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 to 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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Funding Info:
This work was supported by a joint project between the Institute of Materials Research and Engineering, A∗STAR, and NXP Semiconductors under Project IMRE/13-3P1103.