Fabrication of WS_2 Nanofibers from WO_3 Nanofibers Prepared by an Electrospinning Method

摘要

This paper describes a procedure of synthesizing long WS_2 nanofibers. WO_3 nanofibers were prepared as precursors by electrospinning of ammonium meta-tungstate (AMT), polyvinyl alcohol (PVA) and alcohol solution followed by calcination at 550℃ in air. WS_2 nanofibers were obtained by sulfurization of the WO_3 nanofibres at 800℃ in an argon atmosphere, with sulfur powder acting as sulfuration reducer. The nanofibres were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and transmission electron microscopy (TEM). The results show that the final products are pure WS_2 nanofibres, which have high aspect ratio. The WS_2 nanofibers with rough surface were formed of nanoparticles, while some nanoflakes appeared on the surface of WS_2 nanofibres. The diameters of the WS_2 nanofibers were between 200 and 300 nm, which is similar to WO_3 nanofibers. In addition, the WS_2 nanofibers were polycrystalline.