Substrate-directed synthesis of MoS 2 nanocrystals with tunable dimensionality and optical properties.

Autor: Chowdhury T; Department of Chemistry, Johns Hopkins University, Baltimore, MD, USA., Kim J; Department of Chemistry, Johns Hopkins University, Baltimore, MD, USA., Sadler EC; Department of Chemistry, Johns Hopkins University, Baltimore, MD, USA., Li C; Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, USA., Lee SW; Department of Physics, Korea University, Seoul, Republic of Korea., Jo K; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, USA., Xu W; Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA., Gracias DH; Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA., Drichko NV; Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, USA., Jariwala D; Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, USA., Brintlinger TH; Materials Science and Technology Division, United States Naval Research Laboratory, Washington, DC, USA., Mueller T; Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, USA., Park HG; Department of Physics, Korea University, Seoul, Republic of Korea., Kempa TJ; Department of Chemistry, Johns Hopkins University, Baltimore, MD, USA. tkempa@jhu.edu.; Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, USA. tkempa@jhu.edu.
Jazyk: angličtina
Zdroj: Nature nanotechnology [Nat Nanotechnol] 2020 Jan; Vol. 15 (1), pp. 29-34. Date of Electronic Publication: 2019 Nov 18.
DOI: 10.1038/s41565-019-0571-2
Abstrakt: Two-dimensional transition-metal dichalcogenide (TMD) crystals are a versatile platform for optoelectronic, catalytic and quantum device studies. However, the ability to tailor their physical properties through explicit synthetic control of their morphology and dimensionality is a major challenge. Here we demonstrate a gas-phase synthesis method that substantially transforms the structure and dimensionality of TMD crystals without lithography. Synthesis of MoS 2 on Si(001) surfaces pre-treated with phosphine yields high-aspect-ratio nanoribbons of uniform width. We systematically control the width of these nanoribbons between 50 and 430 nm by varying the total phosphine dosage during the surface treatment step. Aberration-corrected electron microscopy reveals that the nanoribbons are predominantly 2H phase with zig-zag edges and an edge quality that is comparable to, or better than, that of graphene and TMD nanoribbons prepared through conventional top-down processing. Owing to their restricted dimensionality, the nominally one-dimensional MoS 2 nanocrystals exhibit photoluminescence 50 meV higher in energy than that from two-dimensional MoS 2 crystals. Moreover, this emission is precisely tunable through synthetic control of crystal width. Directed crystal growth on designer substrates has the potential to enable the preparation of low-dimensional materials with prescribed morphologies and tunable or emergent optoelectronic properties.
Databáze: MEDLINE
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