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Related Experiment Video

Updated: Dec 23, 2025

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Structural Phase Transition of Multilayer VSe2.

Dian Li1, Xiong Wang1, Chi-Ming Kan1

  • 1Physics Department, University of Hong Kong, Hong Kong SAR, P. R. China.

ACS Applied Materials & Interfaces
|April 30, 2020
PubMed
Summary

Annealing multilayer vanadium diselenide (VSe2) at 650 K induces a structural phase transition from the 1T to the 2H phase. This transition is accompanied by a metal-insulator transition, revealing the 2H phase

Keywords:
2D material2H-phasemetal−insulator transitionstructural phase transitionvanadium diselenide

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Vanadium diselenide (VSe2) is a transition metal dichalcogenide (TMD) with potential in electronics and spintronics.
  • The 1T-phase of VSe2 exhibits metallic properties.
  • Exotic properties like charge/spin density waves and ferromagnetism are observed in VSe2.

Purpose of the Study:

  • To investigate the structural and electronic properties of multilayer vanadium diselenide (VSe2).
  • To explore the possibility of phase transitions in VSe2 through annealing.
  • To understand the thermodynamic stability of different VSe2 phases in two-dimensional (2D) form.

Main Methods:

  • Annealing of multilayer VSe2 samples at 650 K.
  • Characterization of structural and electronic properties before and after annealing.
  • Thermodynamic analysis of 1T and 2H phases in 2D.

Main Results:

  • A structural phase transition from the 1T-phase to the 2H-phase of VSe2 was achieved via annealing at 650 K.
  • The structural transition was accompanied by a metal-insulator transition.
  • The 2H-phase of VSe2 was found to be more thermodynamically stable in 2D compared to the 1T-phase.

Conclusions:

  • Annealing is an effective method to control the phase transition and electronic properties of VSe2.
  • The 2H-phase of VSe2 is a promising candidate for future electronic and spintronic applications.
  • Understanding phase stability is crucial for designing 2D materials.