Vertically-oriented WS2 nanosheets with a few layers and its raman enhancements

Yukyung Shin, Jayeong Kim, Yujin Jang, Eunji Ko, Nam Suk Lee, Seokhyun Yoon, Myung Hwa Kim

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Vertically-oriented two-dimensional (2D) tungsten disulfide (WS2) nanosheets were successfully grown on a Si substrate at a temperature range between and 550C 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.

Original languageEnglish
Article number1847
Pages (from-to)1-9
Number of pages9
JournalNanomaterials
Volume10
Issue number9
DOIs
StatePublished - Sep 2020

Keywords

  • Chemical vapor deposition
  • Nanosheet
  • Surface-enhanced Raman scattering
  • Tungsten disulfide

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