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We attempted to fabricate a CO2 sensor that utilizes a quartz crystal microbalance (QCM) coated with an acrylonitrile–styrene copolymer (AS) sensitive membrane. The concentration of CO2 gas diluted with dry N2 gas was determined by measuring the shift in the resonant frequency of the QCM. Since the Earth's atmosphere consists of N2, O2, CO2, Ar, and moisture, the sensitivity of the QCM to Ar, O2,...
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