Synthesis and characterization of WS2/SiO2 microfibers
- 1. Department of Chemistry, Masaryk University, Kotlarska 2, 61137 Brno, Czech Republic
- 2. Department of Materials and Interfaces, Weizmann Institute of Science, 76100 Rehovot, Israel
- 3. Department of Chemical Research Support, Weizmann Institute of Science, 7610001 Rehovot, Israel
- 4. CEITEC MU, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic
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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electrospin_WS2_Kundrat_J Mat Sci 2021 56 10834-10846.pdf
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