Abstract
Fabricating affordable, biocompatible, and biodegradable gas sensors presents challenges due to complex
and costly traditional methods. Despite advancements, most paper-based gas sensors remain time-consuming and environmentally unfriendly. This study introduces a novel approach utilizing PEDOT, known for its biocompatibility and biodegradability, as both sensing and electrode material. PEDOT was deposited using dispense printing and spray coating techniques. The active layer was characterized for ammonia (NH3) detection, evaluating passive (25°C) and active (60°C) recovery methods within the 10-50 ppm range. The sensor exhibits a linear sensitivity of 0.15%/ppm at 25°C and 0.10%/ppm at 60°C, with high reproducibility (standard deviation 0.5) and transient dissolution noted in citric acid over 7 days. Notably, active recovery enhances sensitivity by 50% compared to passive recovery. Optimal sensor performance was observed at 30% RH, demonstrating minimal variability. This flexible and biocompatible sensor shows promise for NH3 sensing in delicate applications such as plant and health wearables, suggesting potential for eco-friendly applications in green electronics.