Figure 11.

Electrical response of pDMAPMAm in the solid state upon continuous exposure to CO₂ for an extended time. (a) Resistance change of the fabricated sensor on exposure to a concentration of 10 vol % CO₂ versus time. The initial decrease in resistance of the pDMAPMAm films over time is denoted here as the “short-term” response of the sensor, while the overall response of the pDMAPMAm films over the whole course of experiments until the final plateau is reached is denoted as “long-term”. (b) Correlation between normalized resistance changes and the concentration of CO₂. Region 1 (R1) and region 2 (R2) are defined for CO₂ concentrations below and above 10 vol %, respectively. Experiments were repeated three times and standard deviations were estimated at each CO₂ concentration.