A novel two-step route to unidirectional growth of multilayer MoS2 nanoribbons

Denys Igorevich Miakota*, Ganesh Ghimire, Rajesh Ulaganathan, Moises Espindola Rodriguez, Stela Canulescu

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Alkali-assisted chemical vapour deposition (CVD) of transition metal dichalcogenides (TMDs) has been shown to promote the growth of large single crystals of TMD monolayers. The morphology control of TMDs is a key parameter for the scalable synthesis of versatile layered materials. This work demonstrates that the alkali-assisted synthesis provides a route toward fabricating highly crystalline MoS2 nanoribbons. Our proposed method involves a vapour-liquid-solid phase reaction between MoOx (2 < x < 3) precursors grown by Pulsed Laser Deposition (PLD) and metal alkali halide (i.e., NaF). The growth process evolves via the emergence of the Na–Mo–O liquid phase, which mediates the formation of MoS2 multilayer nanoribbons in a sulfur-rich environment. Moreover, the as-grown MoS2 nanoribbons are surrounded by mono- and multilayer triangles of MoS2 and exhibit a preferential alignment defined by both MoS2 crystal symmetry and the underlying Al2O3 substrate. In addition, we observe a significant built-in strain in the as-grown MoS2 nanostructures, which increase in magnitude from the multilayer nanoribbons to the triangular monolayers and can be effectively released upon transfer onto another substrate. The growth method developed here can enable flexibility in designing nanoelectronic devices based on TMDs with tunable dimensions.
Original languageEnglish
Article number156748
JournalApplied Surface Science
Volume619
Number of pages8
ISSN0169-4332
DOIs
Publication statusPublished - 2023

Keywords

  • 2D materials
  • TMDs
  • MoS2
  • Chemical Vapor Deposition (CVD)
  • Pulsed Laser Deposition (PLD)
  • MoS2 nanoribbons

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