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Vertically-oriented two-dimensional (2D) tungsten disulfide (WS 2 ) nanosheets were successfully grown on a Si substrate at a temperature range between and 550 °C via the direct chemical reaction between WCl 6 and S in the gas phase. The growth process was carefully optimized by adjusting temperature, the locations of reactants and substrate, and carrier gas flow. Additionally, vertically-oriented 2D WS 2 nanosheets with a few layers were tested as a surface-enhanced Raman scattering substrate for detecting rhodamine 6G (R6G) molecules where enhancement occurs from chemical enhancement by charge transfer transition from semiconductor). Raman spectra of R6G molecules adsorbed on vertically-oriented 2D WS 2 nanosheets exhibited strong Raman enhancement effects up to 9.2 times greater than that on the exfoliated WS 2 monolayer flake sample. From our results, we suggest that the WS 2 nanosheets can be an effective surface-enhanced Raman scattering substrate for detecting target molecules.

Vertically-Oriented WS2 Nanosheets with a Few Layers and Its Raman Enhancements