Abstract
AbstractThis study addresses the role of PANI–CA composites in the detection of acetone vapors with high sensitivity and selectivity in the presence of alcohols. The PANI–CA composites were fabricated by the solution-casting method and were cut to 4 cm × 3 mm rectangular strips of about 20-μm thickness. The composite strips behave as gas sensors/chemoactuators and respond to gaseous species by converting their relative concentration to a corresponding mechanical motion (bending). The bending-recovery responses of PANI/CA sensor was examined thoroughly by exposing it to varying headspace concentrations of acetone and alcohols, and by removing the analyte once the sensor reached its maximum bending angle. Sensitivity was determined by comparing the bending response of the composite strips to different headspace concentrations of acetone. Selectivity was determined through analysis of the angle change in 50/50 ml solutions of four different (potentially interfering) chemicals. The results indicate that the s...
Highlights
Sensors and actuators with gas-detecting capability have recently gained considerable attention due to their critical applications in industry, agriculture, electronics, and medicine
This study addresses the role of PANI–cellulose acetate (CA) composites in the detection of acetone vapors with high sensitivity and selectivity in the presence of alcohols
The strip was tested in different headspace concentrations of acetone and the maximum bending angle was calculated to figure out the sensitivity of the strip to the acetone
Summary
Sensors and actuators with gas-detecting capability have recently gained considerable attention due to their critical applications in industry, agriculture, electronics, and medicine Some of these applications include detection of disease by breath analysis, detecting and monitoring flammable and hazardous gases in environment, and air-quality monitoring. In conducting polymer-based electromechanical actuators, an electrical stimulus triggers volume change and movement is induced during the electrochemical doping-de-doping process.[17,18] More importantly, changes in the conducting polymers’chemical environment can prompt motion or mechanical work in them.
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