Vertically-Oriented WS2 Nanosheets with a Few Layers and Its Raman Enhancements
- 주제(키워드) tungsten disulfide , nanosheet , chemical vapor deposition , surface-enhanced Raman scattering
- 주제(기타) Nanoscience & Nanotechnology
- 주제(기타) Materials Science, Multidisciplinary
- 설명문(일반) [Shin, Yukyung; Kim, Myung Hwa] Ewha Womans Univ, Dept Chem & Nanosci, Seoul 03760, South Korea; [Kim, Jayeong; Jang, Yujin; Ko, Eunji; Yoon, Seokhyun] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Lee, Nam-Suk] Pohang Univ Sci & Technol POSTECH, Natl Inst Nanomat Technol NINT, Pohang 37673, South Korea
- 등재 SCIE, SCOPUS
- OA유형 Green Published, gold
- 발행기관 MDPI
- 발행년도 2020
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000174543
- 본문언어 영어
- Published As http://dx.doi.org/10.3390/nano10091847
- PubMed https://pubmed.ncbi.nlm.nih.gov/32947770
초록/요약
Vertically-oriented two-dimensional (2D) tungsten disulfide (WS2) nanosheets were successfully grown on a Si substrate at a temperature range between and 550 degrees 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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