Fast detection of low concentration carbon monoxide using calcium-loaded tin oxide sensors

摘要: Abstract Solid state sensors with noble metal-loaded tin oxide as sensing elements are widely used for the detection of flammable and toxic gases volatile organic compounds (VOCs). Apart from rendering high cost, incorporation metals often increases preconditioning time introduces a drift in baseline properties sensors. Herein, we report on development stable economically viable sensor modules fast efficient carbon monoxide (CO) air. The layer comprises sonochemically synthesized calcium-loaded (Ca-SnO 2 ) nanocrystals, which calcium primarily gets segregated at SnO grain boundaries (CaO) thereby restricts growth particles. Due to larger ionic radius Ca 2+ compared that Sn 4+ , minute quantity can be doped well into lattice. variation concentration has prominent effect performance, where 5 wt% loading shows highest response. exhibit lower limit 1 ppm CO response (10–12 s) recovery (30–45 s) our sensors, different concentrations CO, equivalent or less those commercially available metal-oxide Additionally, highly minimal even after being operational over 1.5 years is observed.