SnO₂-BASED CO SENSORS: RECENT ADVANCES AND FUTURE DIRECTIONS

SnO 2 -based CO sensors have garnered significant attention due to their remarkable potential in gas sensing applications.This review paper presents a comprehensive analysis of the recent advances and future directions in SnO 2 -based CO sensor development.A detailed examination of various synthesis methods, nanostructured designs, and innovative strategies to enhance the sensitivity and selectivity is provided.The study highlights the pivotal role of advanced fabrication techniques, such as quasi-molecular imprinting and doping with noble metals in improving sensor performance.A comparative analysis with other metal oxide-based sensors, including ZnO, In 2 O 3 , and WO 3 , elucidates on SnO 2 's advantages in terms of the sensitivity and stability.However, challenges including the manufacturing complexity, scalability, stability, and crosssensitivity are addressed, emphasising the need for continued research in these areas.The review also underscores the potential of AI and ML integration for enhanced sensor performance and real-time data analysis.The paper concludes by outlining future directions, including the exploration of hierarchical and composite structures, advancements in catalysts and dopants, scalable manufacturing processes, and applications in various sectors such as healthcare, industrial automation, and environmental monitoring.