Characterization of Rhodamine 6G-Doped Thin Sol-Gel Films

Rhodamine 6G- (R6G) doped thin sol-gel films were cast on glass microscope slides and characterized with the use of steady-state and time-resolved fluorescence spectroscopy. The fluorescence intensity, photodegradation under laser illumination, and excited-state decay kinetics were all investigated as a function of dopant concentration. The excited-state decay kinetics of highly doped films show clear evidence of R6G aggregation. Photodegradation under laser illumination is very interesting and is discussed in detail.

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Excited State Dynamics in the Structural Characterization of Solid Alkyltrimethoxysilane-Derived Sol-Gel Films and Glasses Containing Bound or Unbound Chromophores

Chemistry of Materials ◽

10.1021/cm00044a038 ◽

1994 ◽

Vol 6 (8) ◽

pp. 1351-1357 ◽

Cited By ~ 20

Author(s):

R. Carlisle Chambers ◽

Yair Haruvy ◽

Marye Anne Fox

Keyword(s):

Excited State ◽

Structural Characterization ◽

Sol Gel ◽

Excited State Dynamics ◽

Sol Gel Films

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Characterization of Plasma-Modified Fluoropolymer Surfaces Using Steady-State and Time-Resolved Fluorescence Spectroscopy

Applied Spectroscopy ◽

10.1366/0003702944924826 ◽

1994 ◽

Vol 48 (5) ◽

pp. 630-637 ◽

Cited By ~ 3

Author(s):

Ming Li ◽

Michaeleen L. Pacholski ◽

Frank V. Bright

Keyword(s):

Steady State ◽

Fluorescence Spectroscopy ◽

Sulfonyl Chloride ◽

Sodium Dodecylsulfate ◽

Covalent Immobilization ◽

Ambient Conditions ◽

Time Resolved Fluorescence ◽

Decay Kinetics ◽

Time Resolved

Poly(hexafluoropropylene-co-tetrafluoroethylene) (FEP) has been widely used in biotechnology because of its unique surface properties and biocompatibility. Recent work from our group has shown that plasma discharge-modified FEP can be used as the substratum for development of a very stable immunosensor. This result has prompted us to study further this new surface under ambient conditions. In this paper, we report on the covalent immobilization of a pyrene residue (-Py) onto FEP-APS (FEP-aminopropyl silane) surfaces and the characterization of FEP-APS-Py using steady-state and time-resolved fluorescence spectroscopy. Among the immobilization schemes tested, we found that the covalent coupling of pyrene-sulfonyl chloride to FEP-APS is the easiest and yields the most photostable FEP-APS-Py derivative. Steady-state emission spectra of FEP-APS-Py in contact with H2O, β-cyclodextrin (β-CD), and sodium dodecylsulfate (SDS) aqueous solutions differ considerably from those of Py-SO3 in solution. Time-resolved fluorescence spectroscopy of FEP-APS-Py demonstrates that the decay kinetics are strongly affected by the presence of ionic quenchers and molecular oxygen, as well as β-CD and SDS. The results are consistent with the suggestion that the APS-Py moiety undergoes a slow time-dependent reconfiguration at the FEP/APS interface.

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Excited-state decay of hydrocarbon radicals, investigated by femtosecond time-resolved photoionization: Ethyl, propargyl, and benzyl

The Journal of Chemical Physics ◽

10.1063/1.1857475 ◽

2005 ◽

Vol 122 (9) ◽

pp. 094302 ◽

Cited By ~ 30

Author(s):

Matthias Zierhut ◽

Bastian Noller ◽

Thomas Schultz ◽

Ingo Fischer

Keyword(s):

Excited State ◽

Time Resolved ◽

State Decay ◽

Hydrocarbon Radicals

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Luminescence enhancement of rhodamine 6G in sol-gel films containing silver aggregates

Chemical Physics Letters ◽

10.1016/0009-2614(88)85214-x ◽

1988 ◽

Vol 153 (2-3) ◽

pp. 210-214 ◽

Cited By ~ 64

Author(s):

R. Reisfeld ◽

M. Eyal ◽

D. Brusilovsky

Keyword(s):

Rhodamine 6G ◽

Sol Gel ◽

Luminescence Enhancement ◽

Sol Gel Films

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Ten-Nanosecond Step-Scan FT-IR Absorption Difference Time-Resolved Spectroscopy: Applications to Excited States of Transition Metal Complexes

Applied Spectroscopy ◽

10.1366/0003702971940648 ◽

1997 ◽

Vol 51 (4) ◽

pp. 580-583 ◽

Cited By ~ 23

Author(s):

Pingyun Chen ◽

Richard A. Palmer

Keyword(s):

Excited State ◽

Excited States ◽

Signal To Noise Ratio ◽

Ir Absorption ◽

Decay Kinetics ◽

Time Resolved ◽

Ligand Charge Transfer ◽

Ft Ir ◽

Good Signal ◽

Nanosecond Time Resolution

Ten-nanosecond time resolution has been achieved with step-scan FT-IR absorbance difference spectroscopy (S2FT-IR Δ A TRS) and demonstrated by measuring Δ A spectra of fac-[Re(bpy)(CO)3Cl] and cis-[Os(bpy)2(CO)(4,4′-bpy)]2+ (bpy = 2,2′-bipyridine; 4,4′-bpy=4,4′-bipyridine) in CH3CN solution, following 355-nm laser excitation. In both complexes, the large shifts in (CO) to higher energy are consistent with the assignment that the lowest-energy excited states are metal-to-ligand charge transfer in nature. For [Os(bpy)2(CO)(4,4′-bpy)]2+, it is also possible to measure the excited-state decay kinetics, again with 10-ns resolution. In addition, Δ A bands are observed that are related to excited-state vibrations of the bipyridine ligands. Δ A spectra of good signal-to-noise ratio can be obtained for complexes with lifetimes as short as 10 ns.

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