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Ti3C2TMXene as surface-enhanced Raman scattering substrate.

Hayk Minassian1, Armen Melikyan2, Manuel Rodrigues Goncalves3

  • 1A. Alikhanian National Science Laboratory, Alikhanyan Str. Build. 2, 0036 Yerevan, Armenia.

Nanotechnology
|June 21, 2024
PubMed
Summary

Surface-enhanced Raman scattering (SERS) using Ti3C2Tx MXene flakes is enhanced by quadrupole surface plasmon oscillations, achieving high enhancement factors. This MXene substrate

Keywords:
MXeneSERSabsorption cross-sectionenhancement factorsurface plasmons

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Area of Science:

  • Materials Science and Nanotechnology
  • Spectroscopy and Photonics

Background:

  • Surface-Enhanced Raman Scattering (SERS) relies on electromagnetic field enhancement for sensitive molecular detection.
  • Ti3C2Tx MXene flakes are explored as potential substrates for SERS applications due to their unique properties.

Purpose of the Study:

  • To theoretically analyze electromagnetic field enhancement mechanisms for SERS using Ti3C2Tx MXene flakes.
  • To investigate the influence of MXene flake characteristics on SERS enhancement factors (EF).

Main Methods:

  • Utilized COMSOL simulations to model SERS enhancement factors (EF) for R6G molecules near MXene flakes.
  • Modeled the dye molecule as a sphere with an experimentally derived polarizability spectrum.
  • Analyzed the role of quadrupole surface plasmon (QSP) oscillations and interband transitions (IBTs).

Main Results:

  • Demonstrated that quadrupole surface plasmon (QSP) oscillations are the primary mechanism for SERS enhancement in the 500-1000 nm range.
  • Showed that interband transitions (IBTs) strengthen QSP resonances, yielding EF values of 10^5-10^7.
  • Found weak sensitivity of EF to MXene nanoparticle shape and size, attributed to QSP and IBT independence from flake geometry.

Conclusions:

  • MXene substrates exhibit geometry-independent SERS enhancement, simplifying substrate synthesis for universal applications.
  • The 'lightning rod' and 'hot-spot' effects contribute to electromagnetic SERS enhancement.
  • Ti3C2Tx MXene flakes are promising for the facile fabrication of versatile SERS substrates.