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Fluorophore-Induced Plasmonic Current Generation from Aluminum Nanoparticle Films.

Daniel R Pierce1, Max Bobbin1, Chris D Geddes1

  • 1Institute of Fluorescence, Dept. of Chemistry and Biochemistry, University of Maryland Baltimore County, 701 E Pratt St., Baltimore, Maryland, 21202, USA.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|December 18, 2023
PubMed
Summary

Aluminum nanoparticle films can generate electrical current when near excited fluorophores, a phenomenon known as fluorophore-induced plasmonic current (FIPC). This cost-effective alternative to noble metals shows current magnitude correlates with fluorophore extinction coefficients.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Physical Chemistry

Background:

  • Fluorophore-induced plasmonic current (FIPC) has been observed with noble metal nanoparticle films (MNFs).
  • FIPC involves near-field excited fluorophores coupling with MNFs to induce surface plasmons, generating a measurable electrical current.
  • Cost-effectiveness drives research into adapting FIPC for less expensive metals.

Purpose of the Study:

  • To demonstrate FIPC using aluminum nanoparticle films.
  • To investigate the relationship between fluorophore properties and FIPC magnitude.
  • To support existing literature on the inverse relationship between metal-enhanced fluorescence (MEF) and FIPC.

Main Methods:

  • Fabrication of aluminum nanoparticle films.

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  • Proximity of excited fluorophores to aluminum nanoparticle films.
  • Measurement of induced electrical currents.
  • Quantification of current changes relative to fluorophore extinction coefficients.

    • Main Results:

    • Aluminum nanoparticle films successfully generated FIPC when exposed to excited fluorophores.
    • The magnitude of the induced current was directly proportional to the fluorophore's extinction coefficient.
    • Findings align with previous studies indicating an inverse correlation between MEF and FIPC.

    Conclusions:

    • Aluminum nanoparticle films are a viable and cost-effective platform for FIPC.
    • Fluorophore extinction coefficients are a key factor in determining FIPC magnitude.
    • This research reinforces the understanding of plasmonic interactions between fluorophores and metal nanoparticles.