Vertically-Oriented WS2 Nanosheets with a Few Layers and Its Raman Enhancements
1
Department of Chemistry & Nanoscience, Ewha Womans University, Seoul 03760, Korea
2
Department of Physics, Ewha Womans University, Seoul 03760, Korea
3
National Institute for Nanomaterials Technology (NINT), Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
*
Authors to whom correspondence should be addressed.
†
Authors equally contribute to this work.
Nanomaterials 2020, 10(9), 1847; https://doi.org/10.3390/nano10091847
Received: 18 August 2020
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Revised: 10 September 2020
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Accepted: 12 September 2020
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Published: 16 September 2020
(This article belongs to the Special Issue Characterization, Synthesis and Applications of 2D Nanomaterials)
Vertically-oriented two-dimensional (2D) tungsten disulfide (WS2) nanosheets were successfully grown on a Si substrate at a temperature range between and 550 °C via the direct chemical reaction between WCl6 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 WS2 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 WS2 nanosheets exhibited strong Raman enhancement effects up to 9.2 times greater than that on the exfoliated WS2 monolayer flake sample. From our results, we suggest that the WS2 nanosheets can be an effective surface-enhanced Raman scattering substrate for detecting target molecules.
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Keywords:
tungsten disulfide; nanosheet; chemical vapor deposition; surface-enhanced Raman scattering
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MDPI and ACS Style
Shin, Y.; Kim, J.; Jang, Y.; Ko, E.; Lee, N.-S.; Yoon, S.; Kim, M.H. Vertically-Oriented WS2 Nanosheets with a Few Layers and Its Raman Enhancements. Nanomaterials 2020, 10, 1847. https://doi.org/10.3390/nano10091847
AMA Style
Shin Y, Kim J, Jang Y, Ko E, Lee N-S, Yoon S, Kim MH. Vertically-Oriented WS2 Nanosheets with a Few Layers and Its Raman Enhancements. Nanomaterials. 2020; 10(9):1847. https://doi.org/10.3390/nano10091847
Chicago/Turabian StyleShin, Yukyung, Jayeong Kim, Yujin Jang, Eunji Ko, Nam-Suk Lee, Seokhyun Yoon, and Myung H. Kim. 2020. "Vertically-Oriented WS2 Nanosheets with a Few Layers and Its Raman Enhancements" Nanomaterials 10, no. 9: 1847. https://doi.org/10.3390/nano10091847
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