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

Title
Vertically-Oriented WS2 Nanosheets with a Few Layers and Its Raman Enhancements
Authors
Shin, YukyungKim, JayeongJang, YujinKo, EunjiLee, Nam-SukYoon, SeokhyunKim, Myung Hwa
Ewha Authors
윤석현김명화
SCOPUS Author ID
윤석현scopus; 김명화scopus
Issue Date
2020
Journal Title
NANOMATERIALS
ISSN
2079-4991JCR Link
Citation
NANOMATERIALS vol. 10, no. 9
Keywords
tungsten disulfidenanosheetchemical vapor depositionsurface-enhanced Raman scattering
Publisher
MDPI
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
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.
DOI
10.3390/nano10091847
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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