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Polyoxovanadate fabricated gold nanoparticles: Application in SERS.

Bharat Baruah1, Toni-Ann Miller1

  • 1Department of Chemistry and Biochemistry, Kennesaw State University, Kennesaw, GA 30144-5591, United States.

Journal of Colloid and Interface Science
|October 25, 2016
PubMed
Summary

Gold nanoparticles modified with decavanadate (V10) show enhanced Raman signal strengthening. The larger AuNP-V10-L nanoparticles are excellent substrates for surface-enhanced Raman scattering (SERS) detection.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Spectroscopy

Background:

  • Gold nanoparticles (AuNPs) are widely used in SERS.
  • Surface modification can enhance AuNP performance.
  • Polyoxometalates offer unique electronic and structural properties.

Purpose of the Study:

  • To modify gold nanoparticles with decavanadate (V10).
  • To evaluate the SERS performance of modified AuNPs.
  • To compare different sizes of modified AuNPs.

Main Methods:

  • Synthesis of citrate-capped gold nanoparticles (AuNP-Citrate-S and AuNP-Citrate-L).
  • Surface modification of AuNPs with decavanadate (V10) in aqueous media.
  • Characterization using UV-Vis, FTIR, DLS, TEM, and EDX.
Keywords:
AnalyteGold nanoparticlesPolyoxometalateSERSSurface modification

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Main Results:

  • Successful surface modification yielding AuNP-V10-S and AuNP-V10-L.
  • Both modified nanoparticles demonstrated improved Raman signal enhancement compared to controls.
  • AuNP-V10-L exhibited excellent SERS activity for Raman-active molecules at nanomolar concentrations.

Conclusions:

  • Decavanadate modification enhances the SERS capabilities of gold nanoparticles.
  • AuNP-V10-L is a highly effective SERS substrate.
  • This modification presents a promising approach for sensitive analyte detection.