WO3/La0.8Pb0.2FeO3 perovskite heterostructure for highly active and selective hydrogen sulfide detection

Abstract

In this study, tungsten oxide (WO3) nanofibers were prepared using electrospinning technology and combined with La0.8Pb0.2FeO3 (LPFO) perovskite materials to form a heterostructure film, and then used to evaluate the potential as a gas sensing material. The results show that the pure WO3 nanofiber gas sensor has an excellent sensing effect on nitrogen dioxide (NO2) and hydrogen sulfide (H2S), and the WO3/LPFO heterostructure film gas sensor still has a high response to H2S, but the response to NO2 is suppressed. This WO3/LPFO heterostructure film gas sensor greatly improves the gas selectivity, making the selectivity more specific. The WO3/LPFO heterostructure film gas sensor exhibits excellent gas selectivity for H2S gas, the optimal operating temperature is 175 °C, and the response is about 89.5% under 1.25 ppm H2S gas.