On the Morphology and Optical Properties of Molybdenum Disulfide Nanostructures from a Monomolecular Layer to a Fractal-Like Substructure
- Authors: Domashevskaya E.P.1, Goloshchapov D.L.1, Dambos A.K.1, Rudnev E.V.1, Grechkina M.V.1, Ryabtsev S.V.1
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Affiliations:
- Voronezh State University
- Issue: Vol 53, No 7 (2019)
- Pages: 923-929
- Section: Semiconductor Structures, Low-Dimensional Systems, and Quantum Phenomena
- URL: https://journals.rcsi.science/1063-7826/article/view/206494
- DOI: https://doi.org/10.1134/S106378261907008X
- ID: 206494
Cite item
Abstract
The impact of layer thickness on the morphology and optical properties of MoS2 nanostructures, including monomolecular layers, formed by the carrier-gas-assisted transport of sulfur vapor to the hot zone of a reactor containing metallic molybdenum and subsequent deposition on mica (muscovite) substrates is investigated. Molybdenum disulfide nanostructures of different thicknesses grown at different temperatures of gas-transport synthesis are studied by atomic-force microscopy, optical absorption spectroscopy, and Raman spectroscopy. It is found that synthesis at temperatures of 525–600°C makes it possible to obtain monomolecular MoS2 layers containing trigonal domains and featuring direct-gap optical transitions at 1.84 eV with the formation of excitons at room temperature. Fractal-type MoS2 substructures are obtained for the first time. The frequencies of intralayer and interlayer vibrational modes \(E_{{2g}}^{1}\) and A1g, respectively, in their Raman spectra (377.5 and 403.8 cm–1, respectively) differ both from the corresponding values for a monomolecular layer and the known frequencies for bulk samples. The frequency of the \(E_{{2g}}^{1}\) intralayer mode in these samples (377.5 cm–1) is the lowest of all previously reported.
About the authors
E. P. Domashevskaya
Voronezh State University
Author for correspondence.
Email: ftt@phys.vsu.ru
Russian Federation, Voronezh, 394006
D. L. Goloshchapov
Voronezh State University
Email: ftt@phys.vsu.ru
Russian Federation, Voronezh, 394006
Al Khailani Hasan Ismail Dambos
Voronezh State University
Email: ftt@phys.vsu.ru
Russian Federation, Voronezh, 394006
E. V. Rudnev
Voronezh State University
Email: ftt@phys.vsu.ru
Russian Federation, Voronezh, 394006
M. V. Grechkina
Voronezh State University
Email: ftt@phys.vsu.ru
Russian Federation, Voronezh, 394006
S. V. Ryabtsev
Voronezh State University
Email: ftt@phys.vsu.ru
Russian Federation, Voronezh, 394006