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Reusable SERS Substrates Based on Gold Nanoparticles for Peptide Detection.

Zhang Qi1, Timur Akhmetzhanov1, Arina Pavlova2

  • 1Department of Material Science, Shenzhen MSU-BIT University, International University Park Road 1, Dayun New Town, Longgang District, Shenzhen 518172, China.

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Summary

Researchers developed cost-effective, reusable core-shell nanoparticles for enhanced Raman spectroscopy. These substrates show high sensitivity and uniformity for detecting molecules like malachite green and bovine serum albumin.

Keywords:
biosensorbovine serum albumincore–shell nanoparticlesenhancing substratesgold nanoparticlesmalachite greensurface-enhanced Raman spectroscopy

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Raman spectroscopy is vital for chemical analysis but requires efficient, reproducible enhancing substrates.
  • Developing inexpensive, reusable substrates for surface-enhanced Raman spectroscopy (SERS) remains a significant challenge.

Purpose of the Study:

  • To create a novel, highly efficient Raman-enhancing substrate using core-shell nanoparticles.
  • To demonstrate the substrate's uniformity, sensitivity, and reusability for molecular detection.

Main Methods:

  • Fabrication of gold-silica core-shell nanoparticles.
  • Characterization using UV-vis spectroscopy, dynamic light scattering, and X-ray fluorescence.
  • Substrate evaluation via scanning electron microscopy and Raman spectroscopy with malachite green and bovine serum albumin.

Main Results:

  • The core-shell nanoparticle structure formed an efficient Raman-enhancing substrate.
  • Linear correlation between Raman intensity and malachite green loading indicated uniform hotspot distribution.
  • Achieved a limit of detection of 2.9 μM for malachite green.
  • Demonstrated successful and reusable detection of bovine serum albumin at 55 μg mL⁻¹.

Conclusions:

  • The developed gold-silica core-shell nanoparticle substrates offer a promising solution for SERS applications.
  • The substrates exhibit excellent uniformity, sensitivity, and reusability.
  • Potential applications span biomedical research, clinical diagnostics, and environmental monitoring.