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Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts
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Published on: March 8, 2017

Metal-Enhanced Excimer (P-type) Fluorescence.

Yongxia Zhang1, Kadir Aslan, Michael J R Previte'

  • 1Institute of Fluorescence, Laboratory for Advanced Medical Plasmonics, & Laboratory for Advanced Fluorescence Spectroscopy, Medical Biotechnology Center, University of Maryland Biotechnology Institute, 725 West Lombard St, Baltimore, MD, 21201, USA.

Chemical Physics Letters
|August 15, 2008
PubMed
Summary
This summary is machine-generated.

Researchers observed metal-enhanced excimer fluorescence from pyrene for the first time. Silver island films (SIFs) significantly boosted pyrene fluorescence intensity, aiding plasmon-luminophore interaction studies.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Excimer fluorescence is crucial for understanding molecular interactions.
  • Metal-enhanced fluorescence (MEF) offers a pathway to amplify weak optical signals.
  • Pyrene is a well-studied molecule for fluorescence applications.

Purpose of the Study:

  • To report the first observation of metal-enhanced excimer (P-type) fluorescence from pyrene.
  • To investigate the role of silver island films (SIFs) in enhancing pyrene fluorescence.
  • To explore mechanisms behind plasmon-enhanced fluorescence.

Main Methods:

  • Fabrication of silver island films (SIFs).
  • Coating SIFs with pyrene solutions of varying concentrations (e.g., 5x10⁻³ M).
  • Spectroscopic analysis comparing fluorescence from SIFs and control samples (quartz).

Main Results:

  • Demonstrated a significant enhancement (approx. 2.5-fold) in pyrene excimer emission intensity near SIFs.
  • Observed enhanced fluorescence intensity compared to control samples without silver nanoparticles.
  • Identified enhanced absorption due to localized electric fields as a contributing factor.

Conclusions:

  • Metal-enhanced excimer fluorescence from pyrene is achievable.
  • Surface plasmons efficiently radiate coupled monomer and excimer fluorescence.
  • This work contributes to a unified plasmon-luminophore description for enhanced optical signals.