Abstract
Lanthanum ferrite nanofibers were electrospun from a chemical sol and calcined at 600 °C to obtain single-phase LaFeO3 (LFO) perovskite. High-resolution transmission electron microscopy in conjunction with 3D tomographic analysis confirmed an interwoven network of hollow and porous (surface) LFO nanofibers. Owing to their high surface area and p-type behavior, the nanofiber meshes showed high chemoselectivity toward reducing toxic gases (SO2, H2S) that could be reproducibly detected at very low concentrations (<1 ppm), well below the threshold values for occupational safety and health. An increased sensitivity was observed in the temperature range of 150–300 °C with maximum sensor response at 250 °C. The surface reaction at the heterogeneous solid (LFO)/gas (SO2) interface that confirmed the formation of La2(SO4)3 was investigated by X-ray photoelectron spectroscopy. Moreover, the LFO fibers showed a high selectivity in the detection of oxidizing and reducing gases. Whereas superior detection of NH3 and H...
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