Characteristics and sensing properties of CO gas sensors based on LaCo1 − xFexO3 nanoparticles

LaCo1 − xFexO3 (x ranging from 0 to 1) nanoparticles were prepared using the co-precipitation method, and the CO gas sensing properties of LaCo1 − xFexO3 nanoparticles were investigated. The LaCo0.3Fe0.7O3 sensor shows the highest response at 250 °C (S = 40.9), and reliable dynamic response-and-recovery to different CO concentrations at a temperature as low as 50 °C. On the other hand, the LaCo0.2Fe0.8O3 sensor exhibits the fastest response and recovery in the entire temperature region of 250 to 450 °C. The excellent CO sensing properties could be ascribed to the intense oxidation of CO by adsorbed O2 on the LaCo1 − xFexO3 (x = 0.6, 0.7, 0.8) surface.