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Potential-Modulated Surface-Enhanced Raman Spectroscopy of Tolmetin at Gold Nanoparticle Film Functionalized

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Gold nanoparticles form fractal films at liquid interfaces, enabling sensitive detection of drugs via surface-enhanced Raman spectroscopy (SERS). Film properties, tunable by electrical potential, influence SERS signal intensity and drug detection.

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Area of Science:

  • Colloidal science
  • Nanotechnology
  • Electrochemistry
  • Spectroscopy

Background:

  • Gold nanoparticles (AuNPs) are widely studied for their unique optical properties.
  • Liquid-liquid interfaces offer a unique environment for material self-assembly.
  • Surface-enhanced Raman spectroscopy (SERS) is a powerful technique for ultrasensitive molecular detection.

Purpose of the Study:

  • To investigate the formation and properties of gold nanoparticle fractal films at polarizable liquid-liquid interfaces.
  • To explore the influence of interfacial polarization on film morphology and surface plasmon resonance.
  • To demonstrate the application of these films for in situ SERS detection of drugs.

Main Methods:

  • Aqueous colloidal suspensions of gold nanoparticles (AuNPs) were prepared.
  • Fractal films were formed at a polarizable liquid-liquid interface by adding sodium chloride.
  • Interfacial polarization was controlled using open-circuit potentials (negative, intermediate, positive).
  • In situ SERS was performed using tolmetin as an analyte entrapped in the AuNP film.

Main Results:

  • AuNP fractal films were successfully condensed at the polarizable liquid-liquid interface.
  • Film morphology and surface plasmon properties were modulated by adjusting interfacial polarization.
  • Intense SERS signals were observed for tolmetin entrapped within the AuNP fractal film.
  • Analyte concentration-dependent SERS intensity varied with polarization, indicating chemical-induced damping effects.

Conclusions:

  • Polarizable liquid-liquid interfaces can be used to form tunable gold nanoparticle fractal films.
  • These films exhibit unique surface plasmon properties suitable for in situ SERS.
  • The developed method allows for sensitive detection of drugs with potential for chemical-induced damping effects analysis.