Growth of High-Quality Monolayer Transition Metal Dichalcogenide Nanocrystals by Chemical Vapor Deposition and Their Photoluminescence and Electrocatalytic Properties

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

17 Scopus Citations
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Author(s)

  • Shuangyue Wang
  • Mengyao Li
  • Ashraful Azam
  • Xiaotao Zu
  • Liang Qiao
  • Jack Yang
  • Sean Li

Detail(s)

Original languageEnglish
Pages (from-to)47962-47971
Journal / PublicationACS Applied Materials and Interfaces
Volume13
Issue number40
Online published30 Sept 2021
Publication statusPublished - 13 Oct 2021
Externally publishedYes

Abstract

Two-dimensional transition metal dichalcogenide (TMDC) nanocrystals (NCs) exhibit unique optical and electrocatalytic properties. However, the growth of uniform and high-quality NCs of monolayer TMDC remains a challenge. Until now, most of them are synthesized via a solution-based hydrothermal process or ultrasonic exfoliation method, in which the capping ligands introduced from organic solution often quench the optical and electrocatalytic properties of TMDC NCs. Moreover, it is difficult to homogeneously disperse the solution-based TMDC NCs on a substrate for device fabrication, since the dispersed NCs can easily aggregate. Here, we put forward a novel CVD method to grow closely spaced MoS2 NCs around 5 nm in lateral size. TEM and AFM characterizations demonstrate the monolayer and high-crystalline nature of MoS2 NCs. An obvious blue-shift with 130 meV in photoluminescence signals can be observed. The MoS2 NCs also show an outstanding surface-enhanced Raman scattering for organic molecules due to their localized surface plasmon and abundant edge sites and exhibit excellent electrocatalytic properties for the hydrogen-evolution reaction with a very low onset potential of ∼50 mV and Tafel slope of ∼57 mV/decade. Finally, we further demonstrate this kind of CVD method as a versatile platform for the growth of other TMDC NCs, such as WSe2 and MoSe2 NCs. © 2021 American Chemical Society.

Research Area(s)

  • HER, high-quality, monolayer, PL, SERS, TMDC nanocrystals

Citation Format(s)

Growth of High-Quality Monolayer Transition Metal Dichalcogenide Nanocrystals by Chemical Vapor Deposition and Their Photoluminescence and Electrocatalytic Properties. / Wang, Shuangyue; Huang, Jing-Kai; Li, Mengyao et al.
In: ACS Applied Materials and Interfaces, Vol. 13, No. 40, 13.10.2021, p. 47962-47971.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review