A Self-Assembled Plasmonic Substrate for Enhanced Fluorescence Resonance Energy Transfer

Area of Science:

• Nanotechnology
• Biophotonics
• Materials Science

Background:

• Fluorescence resonance energy transfer (FRET) is crucial for biosensing, molecular imaging, and light harvesting.
• Plasmonic nanostructures can enhance FRET by engineering the photonic environment of fluorophores.
• Tailored FRET enhancement on planar substrates using plasmonics is challenging due to control over spectral properties and spacing.

Purpose of the Study:

• To develop a self-assembled plasmonic substrate for tailored FRET enhancement on planar surfaces.
• To overcome challenges in controlling spectral matching and fluorophore-substrate spacing.
• To create a biocompatible platform for improved FRET-based applications.

Main Methods:

• Fabrication of self-assembled plasmonic substrates using polydopamine (PDA)-coated plasmonic nanocrystals.
• Utilizing PDA coating for nanocrystal self-assembly into closely packed arrays with tunable optical properties.
• Employing PDA as a nanoscale spacer to optimize fluorophore-plasmonic interactions.

Main Results:

• Achieved concurrent control over substrate spectral properties and fluorophore-substrate spacing.
• Demonstrated optimized fluorescence enhancement through tailored FRET.
• Showcased improved FRET efficiency in DNA microarray assays and live-cell imaging.

Conclusions:

• The developed PDA-coated plasmonic substrate effectively enhances FRET efficiency on planar surfaces.
• The substrate's biocompatibility and ease of bioconjugation facilitate diverse biomedical applications.
• This self-assembled plasmonic platform holds promise for advanced fluorescence-based technologies.