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Oxygen plasma induced MoS2/MoOx heterojunction for high performance SERS application.

Xinru Zheng1, Wenxi Wen1, Yajian Wu1

  • 1School of Physical Science and Technology, Ningbo University, Ningbo 315211 Zhejiang, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|June 11, 2025
PubMed
Summary

A novel molybdenum disulfide/molybdenum oxide (MoS2/MoOx) heterostructure serves as a highly sensitive non-metallic substrate for surface-enhanced Raman scattering (SERS). This new SERS substrate enables precise detection of trace molecules, including dyes for food safety applications.

Keywords:
Charge transferHeterostructureMolybdenum disulfide/molybdenum oxideSurface enhanced Raman scattering

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Surface-enhanced Raman scattering (SERS) offers high sensitivity and specificity for trace molecule detection.
  • Developing novel, non-metallic SERS substrates is crucial for advancing analytical techniques.
  • Molybdenum disulfide (MoS2) and its oxides (MoOx) are promising materials for electronic and sensing applications.

Purpose of the Study:

  • To develop a novel MoS2/MoOx heterostructure-based non-metallic SERS substrate.
  • To investigate the effect of oxidation time on the electronic structure and surface properties of the MoS2/MoOx heterojunction.
  • To optimize the SERS performance for highly sensitive molecule detection.

Main Methods:

  • Fabrication of MoS2/MoOx heterojunctions via partial oxidation of MoS2 nanospheres in oxygen plasma (O2+).
  • Controlled adjustment of oxidation time to tune electronic structure and surface properties.
  • Evaluation of SERS performance using Rhodamine 6G (R6G) as a Raman reporter molecule.
  • Application of the optimized substrate for detecting bright blue dyes.

Main Results:

  • Optimized MoS2/MoOx SERS substrate achieved a limit of quantification of 10-8 M for R6G.
  • An enhancement factor (EF) of 8.54 × 108 was obtained for R6G at 10-8 M.
  • The substrate demonstrated a lowest detectable concentration of 10-6 M for bright blue dyes.
  • The developed substrate meets requirements for food safety assessment.

Conclusions:

  • The MoS2/MoOx heterostructure is a promising non-metallic SERS substrate.
  • Precise control over oxidation time is key to optimizing SERS performance.
  • The developed substrate shows significant potential for sensitive detection in food safety and other analytical applications.