Synthesis and characterization of WS2/SiO2 microfibers

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Authors

KUNDRÁT Vojtěch ROSENTSVEIG Rita BRONTVEIN Olga TENNE Reshef PINKAS Jiří

Year of publication 2021
Type Article in Periodical
Magazine / Source Journal of Materials Science
MU Faculty or unit

Faculty of Science

Citation
Web https://link.springer.com/article/10.1007%2Fs10853-021-05979-y
Doi http://dx.doi.org/10.1007/s10853-021-05979-y
Keywords Electrospinning; Tungsten disulfide; Silicotungstic Acid; Polyvinyl alcohol; Fibers
Description Tungsten disulfide polycrystalline microfibers were successfully synthesized by a process involving electrospinning, calcination, and sulfidation steps. We used an aqueous solution of silicotungstic acid (H4SiW12O40) and polyvinyl alcohol as precursors for the synthesis of composite fibers by the needle-less electrospinning technique. The obtained green composite fibers (av. diam. 460 nm) were converted by calcination in air to tungsten oxide WO3 fibers with traces of SiO2 and a smaller diameter (av. diam. 335 nm). The heat treatment of the WO3 fibers under flowing H2/H2S/N2 stream led to conversion to tungsten disulfide WS2 with retention of the fibrous morphology (av. diam. 196 nm). Characterization of the intermediate and final fibers was performed by the XRD, SEM, TEM, HAADF STEM EDS, elemental analyses ICP-OES, and IR spectroscopy methods.
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