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<p>Tungsten disulfide (WS<sub>2</sub>) is a member of the transition metal dichalcogenide family with a layer-number-dependent bandgap and numerous potential applications in optics and optoelectronics; however, the controlled growth process is still challenging. Herein, we report the synthesis details of single- and few-layer WS<sub>2</sub> via sulfurization of WO<sub>3</sub> films, using sodium sulfide (Na<sub>2</sub>S)-assisted substrate pretreatment. Na<sub>2</sub>S plays a role as a source of H<sub>2</sub>S, providing a low-cost efficient and eco-friendly growth method. A combination of x-ray diffraction (XRD) analysis, atomic force microscopy, and Raman spectroscopy confirms that the obtained WS<sub>2</sub> samples indeed consist of a single S-W-S layer. WS<sub>2</sub> demonstrated strong visible-wavelength photoluminescence at room temperature. In addition, we demonstrate a polarization-plane rotation when linearly polarized light propagates through the WS<sub>2</sub> nanolayer, which opens many possibilities for ultrathin optics applications.</p>

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Na2S-Mediated CVD Synthesis of 2D WS2 Flakes

  • 期刊论文

  • 发表日期：

    2025年4月20日

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  • Vladimira Videva,
  • Blagovest Napoleonov,
  • Nikolay Minev,
  • Irnik Dionisiev,
  • Peter Rafailov,
  • Daniela Kovacheva,
  • Deyan Dimov,
  • Velichka Strijkova,
  • Stefan Petrov,
  • Dimitre Dimitrov,
  • Shiuan Huei Lin,
  • Vera Marinova

摘要

Tungsten disulfide (WS2) is a member of the transition metal dichalcogenide family with a layer-number-dependent bandgap and numerous potential applications in optics and optoelectronics; however, the controlled growth process is still challenging. Herein, we report the synthesis details of single- and few-layer WS2 via sulfurization of WO3 films, using sodium sulfide (Na2S)-assisted substrate pretreatment. Na2S plays a role as a source of H2S, providing a low-cost efficient and eco-friendly growth method. A combination of x-ray diffraction (XRD) analysis, atomic force microscopy, and Raman spectroscopy confirms that the obtained WS2 samples indeed consist of a single S-W-S layer. WS2 demonstrated strong visible-wavelength photoluminescence at room temperature. In addition, we demonstrate a polarization-plane rotation when linearly polarized light propagates through the WS2 nanolayer, which opens many possibilities for ultrathin optics applications.