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Surface-Enhanced Raman Spectroscopy Substrate Time Stability Improvement Using an External Oxygen Barrier Method.

Congxi Song1, Xiaoping Li2, Zhihui Jiang1

  • 1Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou, China.

Applied Spectroscopy
|January 15, 2024
PubMed
Summary

Storing surface-enhanced Raman scattering (SERS) substrates in an oxygen-free environment significantly improves their spectral stability over six months. This external oxygen barrier method enhances SERS substrate longevity and practical application potential.

Keywords:
Raman spectrumSERSSurface-enhanced Raman scatteringexternal oxygen barrier methodtime stability

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Surface-enhanced Raman scattering (SERS) substrates suffer from poor time stability, limiting their practical use.
  • Existing core-shell structures for stability enhancement are costly and sensitive to environmental conditions.
  • A novel approach is needed to improve SERS substrate spectral stability without complex fabrication or environmental sensitivity.

Purpose of the Study:

  • To develop and validate a new method for enhancing the spectral stability of SERS substrates.
  • To investigate the efficacy of an external oxygen barrier in preserving SERS signal intensity over time.
  • To compare the stability of SERS substrates stored under different atmospheric conditions.

Main Methods:

  • SERS substrates were stored in controlled environments: air (control) and oxygen-free (vacuum and argon).
  • Raman spectrum intensity was measured repeatedly over six months for each storage condition.
  • Spectral intensity decay was quantified using an attenuation formula and analyzed via curve fitting.

Main Results:

  • SERS substrates stored under vacuum and argon exhibited spectral attenuation rates of less than 20% over six months.
  • This demonstrates a significant improvement in stability compared to substrates stored in ambient air.
  • The external oxygen barrier method proved effective in preserving SERS signal over an extended period.

Conclusions:

  • An external oxygen barrier, achieved by storing SERS substrates in an oxygen-free environment, effectively enhances spectral stability.
  • This method offers a simple yet powerful solution to overcome the limitations of SERS substrate time-dependent degradation.
  • The proposed technique holds promise for advancing the practical applications of SERS technology.