Direct fabrication of La0.7Sr0.3FeO3 nanofibers with tunable hollow structures by electrospinning and their gas sensing properties

Abstract

La 0.7 Sr 0.3 FeO 3 nanofibers with tunable hollow structures are prepared by a facile single capillary electrospinning and annealing process. The hollow nanofibers are characterized by thermogravimetry and differential thermal analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and nitrogen physisorption isotherms. The tunable hollow structures are controlled by adjusting the weight ratio of (La(NO 3 ) 3 Á6H 2 O ? Sr(NO 3 ) 2 ? Fe(NO 3 ) 3 Á 9H 2 O)/PVP. With the increasing of nitrate/PVP ratio, the diameter and the shell thickness of hollow nanofibers increase. Formaldehyde gas sensing properties are carried out in the concentration range of 0.1-100 ppm at the operating temperature of 240°C. The gas sensing mechanism is also discussed.

Electrospun magnetic CoFe2O4/Ag hybrid nanotubes for sensitive SERS detection and monitoring of the catalytic degradation of organic pollutants

“…4a, dominant and distinct peak of PVP at 1674 cm À1 is ascribed to the C]O stretching vibration, while the peaks at 1289 and 651 cm À1 are related to the C-O-C stretching vibration, and the peak at 2923 and 1493 cm À1 can be assigned of CH 2 absorption, the peak at 1374 cm À1 is due to the aliphatic CH group vibration. 34 In addition, the peak at 3500 cm À1 can be attributed to the symmetric vibration of -OH group of the residue water. However, the typical bands corresponding to the PVP molecules almost disappear aer calcination at 550 C. Meanwhile, a new peak at 586 cm À1 attributed to stretching vibrations of tetrahedral complexes is clearly observed, indicating the decomposition of PVP and the formation of (Fig.…”

The Electrospun Ceramic Hollow Nanofibers

“…For instance, as Choi et al [ 28 ] state, zinc oxide (ZnO) hollow nanofibers show higher electronic transport properties compared to their thin film counterparts. Also, hollow nanofibers are able to provide promising photocatalytic activity [ 21 , 29 ], increased crystallinity [ 30 ] and porosity [ 31 , 32 ], optimized electrochemical [ 33 ], magnetic, optical and luminescence properties [ 34 , 35 ], as well as high energy storage capacity [ 36 ].…”