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Issue 22, 2019
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Homogeneous silver colloidal substrates optimal for metal-enhanced fluorescence

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Abstract

Homogeneous silver colloidal films (SCFs), composed of silver nanoparticles 67–193 nm in diameter, were synthesized by a seeded-growth method as the substrates for metal-enhanced fluorescence (MEF). The homogeneity and uniform particle distribution of the SCFs showed many advantages for the exploration of the MEF mechanism. The fluorescence enhancement of 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) and rhodamine 700 (Rh700) dyes dispersed in a thin layer of polystyrene (PS) with the SCFs was observed by time-resolved fluorescence spectroscopy. The fluorescence enhancements of DCM and Rh700 become larger when the surface plasmon resonance bands of SCFs overlap the emission bands of dyes. The particle-size-dependent changes of the radiative and non-radiative rate constants of both dyes with the SCFs are estimated by an improved analysis combining the fluorescence intensity and lifetime measurements and the finite-difference time-domain method simulations.

Graphical abstract: Homogeneous silver colloidal substrates optimal for metal-enhanced fluorescence

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Publication details

The article was received on 30 Jan 2019, accepted on 11 Mar 2019 and first published on 12 Mar 2019


Article type: Paper
DOI: 10.1039/C9CP00585D
Phys. Chem. Chem. Phys., 2019,21, 11599-11607

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    Homogeneous silver colloidal substrates optimal for metal-enhanced fluorescence

    D. Lee, J. Lee, J. Song, M. Jen and Y. Pang, Phys. Chem. Chem. Phys., 2019, 21, 11599
    DOI: 10.1039/C9CP00585D

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