Direct fabrication of La_(0.7)Sr_(0.3)FeO_3 hollow nanofibers by electrospinning and their gas sensing properties

摘要

La_(0.7)Sr_(0.3)FeO_3 hollow nanofibers are prepared by a facile single capillary electrospinning and calcination process. The hollow nanofibers are characterized by Scanning electron microscopy, Transmission electron microscopy and X-ray diffraction. The results indicate that the outer diameters of the hollow nanofibres range in 80-200 nm, and shell thickness are about 20 nm. Formaldehyde gas sensing properties are carried out in the concentration range of 0.1-100 ppm at the optimum operating temperature 240°C. The response and recovery times, and the cross-response to ethanol, toluene, benzene, acetone, methanol, ammonia are measured.