Gas Sensor with Different Morphology of PANI Layer.

Area of Science:

• Materials Science
• Chemical Sensors
• Polymer Chemistry

Background:

• Gas sensors are crucial for environmental monitoring and industrial safety.
• Polyaniline (PANI) offers advantages like ease of synthesis and low cost for sensor applications.
• Resistive sensors based on polyaniline films demonstrate high sensitivity to gas concentrations at room temperature.

Purpose of the Study:

• To design and evaluate a polymer-film-based resistive sensor for gas detection.
• To investigate the effect of different polyaniline (PANI) polymerization methods on sensor performance.
• To assess the sensitivity of PANI films to various gases including ammonia, carbon monoxide, and volatile organic compounds.

Main Methods:

• Synthesis of polyaniline (PANI) active layers using three different polymerization solutions: aqueous, sulfuric acid, and acetic acid.
• Fabrication of resistive sensors utilizing the synthesized PANI films.
• Evaluation of sensor performance in a controlled environment for detecting ammonia, carbon monoxide, nitrogen monoxide, acetone, toluene, and relative humidity in synthetic air.

Main Results:

• Polyaniline (PANI) films exhibit a shift in electrical resistance proportional to gas concentration.
• PANI layers polymerized in acetic acid solutions demonstrated notable sensitivity towards ammonia.
• The developed sensors function effectively at room temperature, highlighting their practical applicability.

Conclusions:

• Polyaniline-based resistive sensors are a cost-effective solution for gas detection.
• The choice of polymerization solution significantly impacts the sensitivity of PANI films to specific gases.
• PANI films synthesized via acetic acid polymerization show promise for selective ammonia sensing applications.