Room Temperature Triethylamine Gas Sensor Based on Flower-Like SnS 2 –PANI Composites

Current semiconductor gas sensors face inherent limitations from high operational temperatures, constraining practical deployment. To address this, we developed a room-temperature triethylamine (TEA) gas sensor based on flower-like SnS2-PANI heterostructures. Comparative assessment of five sensor variants—pristine PANI, SnS2, and 10%/20%/30% SnS2-PANI composites—revealed that the 20% SnS2-PANI sensor exhibited commendable selectivity and sensitivity to TEA gas at ambient temperature. Specifically, this sensor achieved a response rate of 75.4% for 100 ppm TEA gas. The concentration gradient fitting curve demonstrated strong linearity, indicating its suitability for quantitative TEA measurement across varying concentrations. The three-dimensional flower-like morphology enhances the specific surface area accessible for gas molecule interactions, thereby providing a greater availability of active sites. Additionally, the p-n heterojunction involving PANI and SnS2facilitates the adsorption and reaction processes of TEA gas while also promoting protonation and deprotonation dynamics of both the gas molecules and PANI. This research highlights the potential of flower-like SnS2-PANI sensors for room-temperature TEA detection and demonstrates their viability for real-time environmental TEA measurement in industrial emission scenarios.