Plasma-Polymerized Thiophene-Reduced Graphene Oxide Composite Film Sensor for Ammonia/Amine Detection at Room Temperature

Industrialization has led to an increasing need for specific and selective gas sensors in the past few decades. Environmental monitoring of certain volatile compounds such as ammonia is necessary. Advancements food storage sector have created cheap effective amine chemosensors. Classical chemosensors still face several issues, a lack selectivity low sensitivity toward amines. Sensitivity defined relative change response expressed percentage. In this work, we resolved issues associated with sensors, selectivity, long-term instability, unreliability under higher temperatures using plasma-polymerized thiophene (PPTh) reduced graphene oxide (rGO) composite films. PPTh films were prepared RF plasma polymerization optimized deposition parameters. Several samples evaluated their sensing understand optimal rGO ratio PPTh-rGO composite. These shown 4 times ammonia/amines than individual Ammonia, methylamine (MA), dimethylamine (DMA), trimethylamine (TMA) primary analytes tested The measured ranges from 1328 2354 at 1000 ppm. order was found be MA > Ammonia DMA TMA. Polymer swelling, charge carriers, disruption conductive pathways can explain possible mechanisms. high 110 ammonia/amine over other commonly used organic compounds. these stable any temperature fluctuations 30 °C 150 °C. Additionally, showed months. Thus, effectively develop highly environmental ammonia/amines.