Light Trapping to Amplify Metal Enhanced Fluorescence with Application for Sensing TNT

Matoian, Meredith A.; Sweetman, Richard H.; Hall, Emily C.; Albanese, Shayna; Euler, William B.

doi:10.1007/s10895-013-1232-8

Cited by 15 publications

(13 citation statements)

References 12 publications

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“…To further investigate the extent of this type of detection, a solid-phase sensing element was constructed using thin films of Rh6G deposited on polymer-coated substrates to detect TNT. 26 It was found that not only does this sensing element detect TNT in the gas phase efficiently, but adding the PVDF layer between the dye and substrate caused a 100−1000 times enhancement in the emission of Rh6G, depending on the substrate beneath the PVDF, when compared to samples that had Rh6G deposited directly onto substrate. To exploit this enhancement in signal, an array of thin films of other xanthene dyes was prepared on PVDF-coated glass microscope slides and was exposed to a variety of explosive analytes.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The purpose of this study is to investigate the role that the PVDF layer has on the previously reported emission enhancement. 26 We report the photophysical behavior of Rh6G deposited onto PVDF films as a function of both the Rh6G thickness and the PVDF thickness. The observed emission enhancement of Rh6G when deposited on the polymer film as compared to a glass substrate arises from three sources.…”

Section: ■ Introductionmentioning

confidence: 99%

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The Influence of Interfacial Effects on the Photophysics of Rhodamine 6G Thin Films on a Poly(vinylidene fluoride) Surface

Mullen

Euler

2017

Langmuir

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The spectral response of ultrathin films of rhodamine 6G (Rh6G) cast onto polyvinylidenefluoride (PVDF) coated glass slides is studied to investigate a perceived fluorescence emission enhancement. Varying the thickness of the Rh6G layer (submonolayer to multiple layers) on the PVDF layer revealed the existence of multiple Rh6G species on the surface, similar to previous reports on glass. Excitation spectra show that J-type excitons are not responsible for an emission enhancement. Trends in the fluorescence emission intensity show that the surface roughness of the PVDF layer prevents the Rh6G molecules from organizing the way they would on a smooth glass surface. The PVDF surface roughness preserves the emissive monomers and excited-state excimers of Rh6G while reducing the self-quenching of aggregates. Coupled with this is an internal reflection effect that causes light to be trapped between the Rh6G/PVDF and PVDF/glass interfaces. This effect leads to multiple absorption events, and thus more efficient use of the incident light.

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Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

The Influence of Interfacial Effects on the Photophysics of Rhodamine 6G Thin Films on a Poly(vinylidene fluoride) Surface

Mullen

Euler

2017

Langmuir

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“…Surface Enhanced Raman Scattering (SERS) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and` Metal Enhanced Fluorescence (MEF) [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] both exploit the electric field enhancement associated with a plasmon resonance to substantially increase the spectroscopic signal. Despite the mechanistic similarities between SERS and MEF, there are few reports of SERS and MEF on the same structures.…”

Section: Introductionmentioning

confidence: 99%

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

Kohr

Karawdeniya

Dwyer

et al. 2017

Phys. Chem. Chem. Phys.

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Rhodamine 6G is spin-cast onto gold surfaces and the reflectance, emission, excitation, and SERS spectra are reported. Electron microscopy shows that the particle sizes of the gold are uniform for all preparations. Reflection spectra show that the Rh6G aggregates for thicker films and that the gold plasmon band shifts due to the refractive index change on the surface. The intensity of the SERS spectra increases with increasing surface coverage but the rate of change modulates between submonolayer and multilayer surface densities. The emission spectra behave unexpectedly as a function of Rh6G coverage. At submonolayer coverage the emission is relatively strong, decreases as the surface density increases to a monolayer, and then increases as the Rh6G thickness increases. Excitation spectra demonstrate that the emitting species at low surface density is monomeric but for thicker layers the excited state responsible for emission is Rh6G aggregates. For the thicker films, the Rh6G acts as its own dielectric layer for metal enhanced fluorescence of the aggregates.iii ACKNOWLEDGMENTS

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“…We have previously reported that xanthene dyes are effective sensors for explosives [ 1 , 2 , 3 ]. The key discovery was that significant fluorescence signal enhancement can be achieved using a three-layered sensor design comprised of a substrate, a spin-coated sub-micron-layer of a transparent polymer, and topped with the fluorophore monolayer [ 2 ]. Further, we showed that the nature of the polymer layer, both in terms of thickness and morphology, influenced the sensor performance [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Surface Morphology of Spin-Coated Poly(Methyl Methacrylate) Thin Films

Chapman

Euler

2021

Polymers

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The morphology of sub-micron poly(methyl methacrylate) films coated to glass supports by spin coating from toluene is examined using surface profilometry. Wrinkled surfaces with local quasi-sinusoidal periodicity were seen on the surfaces of films with thicknesses of larger than 75 nm. The surface wrinkles had large aspect ratios with wavelengths in the tens of microns and amplitudes in the tens of nanometers. Wrinkles that formed during spin-coating are attributed to surface perturbations caused by Rayleigh–Bénard–Marangoni convective instabilities. The effects of film thickness, coating solution concentration, and drying rate on the thin film surface morphology are investigated. The results can be used to prepare surfaces with controlled morphology, either smooth or with periodic wrinkles.

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Light Trapping to Amplify Metal Enhanced Fluorescence with Application for Sensing TNT

Cited by 15 publications

References 12 publications

The Influence of Interfacial Effects on the Photophysics of Rhodamine 6G Thin Films on a Poly(vinylidene fluoride) Surface

The Influence of Interfacial Effects on the Photophysics of Rhodamine 6G Thin Films on a Poly(vinylidene fluoride) Surface

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

Evolution of Surface Morphology of Spin-Coated Poly(Methyl Methacrylate) Thin Films

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