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Related Experiment Video

Updated: Jul 9, 2025

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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Phase-Engineered WS2 Monolayer Quantum Dots by Rhenium Doping.

Hoon Ju Lee1,2, Myeonggi Choe3,4, Weiguang Yang1

  • 1Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.

ACS Nano
|December 7, 2023
PubMed
Summary
This summary is machine-generated.

We synthesized Re-doped WS₂ monolayer quantum dots (MQDs) by controlling phase transitions. The 1T

Keywords:
colloidal methoddopinghydrogen evolution reactionphase transitionquantum dottransition metal dichalcogenidetungsten disulfide

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Transition metal dichalcogenides (TMDs) exist in stable (2H) and metastable (1T) phases.
  • Phase engineering of TMDs is crucial for energy storage and electrocatalysis.
  • Controlling TMD phase transitions and synthesis remains a challenge.

Purpose of the Study:

  • To synthesize Re-doped WS₂ monolayer quantum dots (MQDs) with controlled phase.
  • To investigate the mechanism of Re-induced phase transitions in WS₂.
  • To evaluate the catalytic performance of phase-engineered WS₂ MQDs for hydrogen evolution reaction.

Main Methods:

  • Colloidal chemical synthesis of Re-doped WS₂ MQDs.
  • Systematic variation of Re doping concentration.
  • Characterization using scanning transmission electron microscopy (STEM).

Main Results:

  • Re doping induces strain in the 2H phase (S2H), transitioning to 1T and 1T' phases with increasing Re concentration.
  • Controlled experiments with MoS₂ doping confirmed Re's role in phase engineering.
  • 1T' WS₂ MQDs with 49 at.% Re exhibited superior hydrogen evolution reaction (HER) performance.

Conclusions:

  • Re doping provides a viable route for phase engineering of TMDs like WS₂ and MoS₂.
  • The study elucidates the mechanism of Re-induced phase transitions.
  • Phase-engineered 1T' WS₂ MQDs show significant potential for efficient HER catalysis.