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

Abstract

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.

Keywords

• PANI
• gas sensor
• Ammonia
• IDT
• PCB

Gaz Sensörü Uygulamaları İçin Sensör Yapısı Tasarımı ve Prototip Geliştirilmesi

Abstract

Gaz duyarlı malzemelerin incelenmesi ve sensör üretim teknikleri, hassas ve düşük maliyetli gaz algılama süreçlerine olan ilginin artmasıyla günümüzde büyük ilgi gören araştırma konuları arasındadır. Bu çalışmada, NH3 tespiti için algılama katmanı olarak polianilin (PANI) filmler kullanan bir gaz sensörü geliştirilmiş ve gerçekleştirilmiştir. Sensörler, üç farklı iç içe geçmiş elektrot (IDT) geometrisi ile uygun maliyetli bir üretim yöntemi kullanılarak üretilmiş ve sensörlerin elektriksel direnci gaz algılama işlemi boyunca izlenmiştir. Direnç hızla artmış, 120 saniyede maksimuma ulaşmış ve ardından 600 saniyede temel seviyeye geri dönerek kararlı bir tepki deseni göstermiştir. Bu ölçümlerden tepki süresi ve toparlanma süresi sırasıyla 120 saniye ve 480 saniye olarak belirlenmiştir. Bulgular, algılama katmanını oluşturan malzemenin özelliklerinin sensör performansını önemli ölçüde etkilemesine rağmen, elektrot geometrisindeki değişikliklerin gaz algılama davranışı üzerinde sınırlı bir etkisi olduğunu göstermiştir. PANI, NH₃ tespiti gibi gaz algılama uygulamaları için pratik ve etkili bir yaklaşım sunar ve çevresel ve biyomedikal izleme uygulamaları için uygun, güvenilir ve düşük maliyetli bir çözüm sağlar.

Keywords

• PANI
• gaz sensörü
• Amonyum
• IDT
• PCB

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