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Related Experiment Video

Updated: Sep 9, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Metallic NbS2 One-Dimensional van der Waals Heterostructures.

Wanyu Dai1, Yongjia Zheng2, Akihito Kumamoto3

  • 1Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan.

ACS Nano
|September 4, 2025
PubMed
Summary

This study demonstrates metallic niobium disulfide (NbS2) nanotubes using a novel salt-assisted CVD method. The technique allows controlled synthesis of 1D van der Waals heterostructures with potential applications in advanced materials.

Keywords:
CVD synthesisDFT calculationNbS2one-dimensional van der Waals heterostructurestransmission electron microscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Van der Waals (vdW) heterostructures offer tunable electronic properties.
  • Metallic transition metal dichalcogenides (TMDs) are crucial for advanced electronic devices.
  • Controlled synthesis of 1D metallic vdW nanostructures remains challenging.

Purpose of the Study:

  • To experimentally demonstrate metallic NbS2-based 1D vdW heterostructures.
  • To develop a controlled synthesis method for high-quality NbS2 nanotubes.
  • To investigate the stabilization mechanisms of these 1D nanostructures.

Main Methods:

  • Modified NaCl-assisted chemical vapor deposition (CVD) with a "remote salt" strategy.
  • Growth of NbS2 nanotubes on single-walled carbon nanotube-boron nitride nanotube (SWCNT-BNNT) templates.
  • Characterization using HRTEM, STEM, UV-vis-NIR, FTIR, Raman spectroscopy, and DFT calculations.

Main Results:

  • High-quality, crystalline NbS2 nanotubes with a preference for double-walled structures were synthesized.
  • Morphologies could be tuned from 1D nanotubes to 2D flakes.
  • Optical and Raman spectroscopy confirmed the metallic nature and relative ambient stability of NbS2.
  • DFT calculations revealed interlayer charge transfer and Coulomb interactions stabilize double-walled NbS2 nanotubes.

Conclusions:

  • A framework for synthesizing metallic 1D vdW heterostructures was established.
  • The "remote salt" CVD strategy enables precise control over NbS2 nanostructure growth and morphology.
  • Understanding stabilization mechanisms is key for designing future metallic vdW nanomaterials.