Akademik Veri Yönetim Sistemi
5th International Conference on Light and Light-based Technologies, Ankara, Türkiye, 15 - 17 Mayıs 2025, ss.102, (Özet Bildiri)
The rising demand for fresh, minimally processed, and ready-to-eat foods,along with the increasing complexity of global supply chains, poses serious food safetychallenges. Key concerns include temperature fluctuations, packaging failures, andmicrobial spoilage, especially in animal-based products like meat, fish, and poultry.Gas sensor technologies have thus gained attention for their ability to detect earlysigns of spoilage in packaged foods. Among these, flexible substrate-based sensorsthat detect ammonia (NH₃), a key spoilage indicator, have emerged as promising toolsfor smart packaging.This study presents an eco-friendly, low-cost, and flexible NH₃ gas sensor suitable forintegration into food packaging. The sensor was fabricated on paper using aerosol jetprinting (AJP), where interdigitated electrodes were formed with carbon nanoparticleink (Novacentrix JR-038). Among the paper types tested—Whatman Grade 2,nitrocellulose, and standard filter paper—Whatman Grade 2 was selected for itsdurability and heat resistance. The sensing mechanism is based on the interactionbetween NH₃ and adsorbed water molecules, producing OH⁻ ions(NH₃+H₂O→NH₄⁺+OH⁻), which increase conductivity and cause a measurableresistance to change between electrodes.The sensor was annealed at 100 °C for 10 minutes, achieving a surface resistance of210 kΩ. In testing, aqueous ammonia gradually evaporated, reaching ~140 ppm NH₃in 20 minutes. During this period, the sensor's resistance dropped from 600 MΩ to9 MΩ, indicating successful gas detection. These results highlight the potential ofaerosol jet printed carbon-based sensors as effective components of smart packagingto enhance food safety and reduce waste.