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Related Experiment Videos

Low temperature metal-enhanced fluorescence.

Yongxia Zhang1, Kadir Aslan, Michael J R Previte

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

Journal of Fluorescence
|September 13, 2007
PubMed
Summary
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Metal-Enhanced Fluorescence (MEF) is more pronounced at low temperatures. Fluorophores near Silver Island Films show greater fluorescence enhancement at 77 K compared to room temperature, demonstrating enhanced MEF.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Metal-Enhanced Fluorescence (MEF) describes the significant increase in fluorescence intensity of nearby fluorophores when placed in proximity to metallic nanostructures.
  • Silver Island Films (SiFs) and gold nanoparticles are known to exhibit MEF properties at room temperature, typically enhancing fluorescence by two- to ten-fold.
  • The influence of cryogenic temperatures on the MEF phenomenon and its underlying mechanisms remains an area requiring further investigation.

Purpose of the Study:

  • To investigate the impact of low temperatures, specifically 77 K, on the Metal-Enhanced Fluorescence (MEF) phenomenon.
  • To compare the MEF efficiency of fluorophores near Silver Island Films (SiFs) at cryogenic temperatures versus room temperature.
  • To explore the temperature-dependent MEF across various visible wavelengths and with different metallic nanostructures, including gold colloids.

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Main Methods:

  • Experimental setup to measure fluorescence signatures of fluorophores in close proximity to Silver Island Films (SiFs) and 20 nm gold colloids.
  • Comparison of fluorescence enhancement at room temperature (approx. 298 K) and low temperature (77 K).
  • Utilized an identical glass substrate as a control to isolate the metal-enhanced effects.

Main Results:

  • MEF was observed to be significantly more pronounced at 77 K compared to room temperature for fluorophores near SiFs.
  • The fluorescence enhancement at 77 K was greater than that observed with an identical glass control sample, confirming enhanced MEF.
  • Further enhancements in MEF were demonstrated at low temperatures across a range of visible wavelengths and for both SiFs and gold colloids.

Conclusions:

  • Low temperatures, specifically 77 K, substantially enhance the Metal-Enhanced Fluorescence (MEF) phenomenon.
  • The observed pronounced MEF at 77 K suggests potential for improved sensitivity in fluorescence-based applications at cryogenic conditions.
  • The findings are applicable to various fluorophores and metallic nanostructures, including SiFs and gold nanoparticles, across the visible spectrum.