Recent Trends in Chemiresistive Gas Sensing Materials

This chapter discusses the device design, mechanism, innovative materials, and factors influencing sensing activity. It describes prospective materials and conventional analytes for chemiresistive sensing and explores next directions, key challenges, prospects for commercialization, and opportunities for next-generation chemiresistive sensors. Chemiresistive sensors are based on the simple change in resistance in response to the binding of analytes. The analyte is a chemical that is to be sensed by chemiresistive sensors. Sensing materials are the heart of chemiresistive sensors and they interact and sense the analyte and produce the response. In 1985, the best chemiresistive application was from copper phthalocyanine complex. Polymers are the second foremost explored chemiresistive sensor material after metal oxides. Composites-based chemiresistive sensors are evolving in recent times based on the fact that combining two high-performing materials provides peak performance. Complexes were attempted for chemiresistive sensing because of their binding/anchoring properties with gas molecules.