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Endalamaw Ewnu Kassa

Catalysis 2023
Endalamaw Ewnu Kassa, Speaker at Chemistry Conferences
Ming Chi University of Technology, Taiwan
Title : Optimal solvent selection to develop highly responsive and selective MAPbI3-based ammonia gas sensors


Metal halide perovskite materials have emerged as promising candidates for the development of highly responsive ammonia gas sensors due to their sensitivity to low gas concentrations, with potential applications in safeguarding human health and environmental ecosystems. Typically, dimethylformamide (DMF) has been the preferred solvent for preparing MAPbI3 perovskite solutions in sensor fabrication. In this study, we explored the impact of an alternative solvent, dimethylacetamide (DMaC), on sensor response by comparing it with DMF solvent. Our findings reveal that solvent selection significantly influences the ammonia gas sensor's response. When DMaC was used as the solvent for MAPbI3 solution preparation, we observed a remarkable response of 237% and 22% response achieved with DMF solvent. This enhancement in sensor response can be attributed to DMaC's exceptional solubility power and low viscosity, facilitating the efficient preparation of MAPbI3 solutions, resulting in improved gas-sensing capabilities. In conclusion, our study showed the critical role of solvent choice in optimizing perovskite-based ammonia gas sensors. DMaC with its unique characteristics, emerges as a selective solvent for MAPbI3 solution preparation, offering the potential for significantly enhanced sensor response. This work paves the way for future advancements in gas-sensing technology, contributing to improved environmental protection and human safety


Endalamaw Ewnu Kassa is currently pursuing a master’s degree in electronic engineering (MSc) at Ming Chi University of Technology (MCUT) in Taiwan, building on his prior educational background with a bachelor’s degree in physics (BSc) from Wollo University in Ethiopia. In January 2022, he joined organic electronic research group at MCUT, Taiwan. He is keenly exploring the realms of perovskite-based gas sensor technology, organic photodetectors (OPD), and light-emitting diodes (LED). From 2017 to 2021, he served as an assistant lecturer and assistant lab technician, accumulating valuable professional experience in academia.