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Tunable metal-enhanced fluorescence by stimuli-responsive polyelectrolyte interlayer films.

Ning Ma¹, Fu Tang, Xiaoyu Wang

¹School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China.

Macromolecular Rapid Communications

|March 26, 2011

Summary

We demonstrate tunable metal-enhanced fluorescence (MEF) using silver nanostructures and porphyrin molecules. By adjusting an interlayer, we controlled the distance, enhancing fluorescence up to 25-fold.

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Area of Science:

Nanotechnology
Materials Science
Spectroscopy

Background:

Metal-enhanced fluorescence (MEF) offers a powerful route to amplify weak molecular signals.
Silver (Ag) nanostructures exhibit excellent plasmonic properties suitable for MEF applications.
Controlling the distance between fluorophores and nanostructures is crucial for optimizing MEF.

Purpose of the Study:

To investigate the tunable MEF of silver nanostructures with porphyrin molecules.
To explore the use of stimulus-responsive polymer multilayers for distance control in MEF.
To achieve controlled modulation of MEF intensity through environmental stimuli.

Main Methods:

Fabrication of highly dendritic silver (Ag) nanostructures.
Incorporation of porphyrin molecules (Por⁴⁻) as fluorophores.
Assembly of a stimulus-responsive poly(acrylic acid)/poly(diallyldimethylammonium chloride) (PAA/PDDA) multilayer film as an interlayer.
Tuning the distance between Por⁴⁻ and Ag nanostructures by varying ionic strength and pH.

Main Results:

Achieved a significant enhancement of porphyrin fluorescence by up to 25 times using Ag nanostructures.
Demonstrated controlled tuning of MEF intensity by adjusting the interlayer thickness via ionic strength and pH.
Confirmed the distance-dependent nature of MEF effects in the composite system.

Conclusions:

The developed system allows for tunable MEF through controlled manipulation of fluorophore-nanostructure distance.
Stimulus-responsive polymer multilayers provide an effective platform for dynamic MEF modulation.
This approach holds promise for applications requiring sensitive and controllable fluorescence enhancement.