Chemiresistive Gas Sensors: Bibliometric Trends and Recent Research Progress

The rapid increase in industrialization and technological progress in recent years has led to the emission of various toxic and harmful gases, which contribute to the deterioration of air quality; Therefore, air quality monitoring has become of paramount importance. Among the various sensor technologies available, chemiresistive gas sensors (CGSs) have attracted considerable attention due to their simplicity in construction, cost-effectiveness, and ability to detect a wide range of gases. This review provides a comprehensive overview of the importance of CGSs in diverse applications, including environmental monitoring, industrial safety, and healthcare. The present review discusses bibliometric analysis highlighting publication trends, citation metrics, collaboration networks, and keyword usage, providing insights into the research field by analyzing Scopus data from 2013 to 2023. It also summarizes recent advances in CGS technology, including new sensor materials, fabrication techniques, and integration of CGS into smart devices. Despite significant progress, challenges such as excellent selectivity and sensitivity, and long-term stability still remain uncertain. We also discuss future research directions aimed at addressing these challenges, including development of novel materials, use of machine learning for improved selectivity, and miniaturization of sensors for various applications, including flexible and wearable applications.