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Related Concept Videos

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Related Experiment Video

Updated: Jun 22, 2026

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol
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Substrate-related optical activity in monolayer WS 2 ${\rm WS}_2$ and MoSe 2 ${\rm MoSe}_2$ : A tip-enhanced Raman

Rafael Nadas1,2, Lucas Liberal2, Gabriel Bargas2

  • 1Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Germany.

Journal of Microscopy
|September 18, 2025
PubMed
Summary

Tip-enhanced Raman spectroscopy (TERS) reveals how substrate interactions affect two-dimensional materials like tungsten disulfide (WS2) and molybdenum diselenide (MoSe2). Nanoscale analysis shows wrinkles and local variations influence their vibrational properties.

Keywords:
TERSTMDssubstrate effects

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Two-dimensional materials, such as transition metal dichalcogenides (TMDs), exhibit properties highly sensitive to substrate interactions.
  • Conventional Raman spectroscopy has limited spatial resolution, obscuring local variations in strain and doping that impact TMD behavior.
  • Understanding these substrate effects is crucial for tailoring TMD properties for advanced applications.

Purpose of the Study:

  • To investigate the influence of substrate interactions on the vibrational properties of monolayer tungsten disulfide (WS2) and molybdenum diselenide (MoSe2) at the nanoscale.
  • To overcome the resolution limitations of conventional Raman spectroscopy by employing tip-enhanced Raman spectroscopy (TERS).
  • To correlate nanoscale topographical features with local variations in strain, doping, and dielectric screening.

Main Methods:

  • Utilized tip-enhanced Raman spectroscopy (TERS) to achieve nanometric spatial resolution.
  • Investigated monolayer WS2 and MoSe2 samples on glass and glass/hexagonal boron nitride (hBN) substrates.
  • Analyzed the relationship between Raman spectral features and substrate-induced topographical inhomogeneities.

Main Results:

  • TERS enabled direct correlation between Raman signals and nanoscale structural features like wrinkles.
  • Observed local variations in strain, doping, and dielectric screening across the substrate interface.
  • Demonstrated that nanoscale structural features locally modulate the vibrational response of WS2 and MoSe2.

Conclusions:

  • TERS is a powerful technique for probing local variations in 2D materials, overcoming limitations of conventional methods.
  • Substrate interactions, including topographical features, significantly influence the vibrational properties of TMDs at the nanoscale.
  • The findings provide insights into controlling and optimizing 2D material properties through substrate engineering.