Design and Prototype Development of a Sensor Structure for Gas Sensing Applications

The study of gas-sensitive materials and sensor fabrication techniques are among the great interest research topic today with the increasing interest in sensitive and low-cost gas sensing processes. In this study, a gas sensor developed with polyaniline (PANI) films as a sensing layer for NH3 detection and performed. Sensors were fabricated using a PCB fabrication method with three different interdigitated electrode (IDT) geometries, in which geometries has 5, 10, 20 IDT fingers. The electrical resistance of the sensors was monitored during gas sensing process. The resistance increased rapidly, reaching a maximum in 120 seconds and then returned to the baseline in 600 seconds, exhibiting a stable response pattern. From these measurements, the response time and recovery time were determined to be 120 seconds and 480 seconds, respectively. The findings showed that although the properties of the material constituting the sensing layer significantly affect the sensor performance, changes in the electrode geometry have a limited effect on the gas sensing behavior. PANI offer practical and efficient approach for gas sensing applications as NH₃ detection and it provides a suitable, reliable and low-cost solution for environmental and biomedical monitoring applications.