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

In this study, tungsten oxide (WO₃) nanofibers were prepared using electrospinning technology and combined with La_0.8Pb_0.2FeO₃ (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.