Fluorescence Behavior of Dyes in Thin Films of Various Polymers

Shundo, Atsuomi; Okada, Y.; Ito, Fuyuki; Tanaka, Keiji

doi:10.1021/ma201901x

Cited by 35 publications

(28 citation statements)

References 44 publications

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“…This has been confirmed previously for the singlet lifetime of DBMBF 2 , where an increase by a factor of three when changing from non-polar (n-hexane) to a polar (THF) solvent was reported [15]. In polymers matrices, similar behavior has been documented, in which polar dyes presented longer lifetimes in polymers with higher dielectric constants [36]. Other factors can be assigned to these lifetime changes, as rigidochromic effects [37,38], reabsorption processes [39] or dye-dye interaction due to aggregation [21].…”

Section: Singlet Fluorescent Behaviorsupporting

confidence: 82%

Gas Response Behaviour and Photochemistry of Borondiketonate in Acrylic Polymer Matrices for Sensing Applications

et al. 2014

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The fluorescent spectra in combination with gas response behavior of acrylic polymers doped with dibenzoyl(methanato)boron difluoride (DBMBF2) were studied by fluorescence spectroscopy and time-resolved fluorescence lifetime. The role of acrylic matrix polarity upon the fluorescence spectra and fluorescence lifetime was analyzed. Changes in emission of the dye doped polymers under exposure to toluene, n-hexane and ethanol were monitored. The fluorescence lifetimes were measured for the singlet excited state as well as the exciplex formed between DBMBF2 and toluene. A reduction of the transition energy to the first singlet-excited state in the four polymers was observed, compared to solution. Reversible exciplex formation, viz. a red shifted fluorescence emission was perceived when exposing the polymers to toluene, while for hexane and ethanol only reversible reduction of the fluorescence occurred. Longer singlet and shorter exciplex lifetimes were observed for non-polar matrixes. The latter mechanism is explained in function of the lower charge transfer character of the exciplex in non-polar matrixes. Additionally, the quantum yield of the dye in the polymer matrix increased almost seventh-fold compared to values for solution.

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Section: Singlet Fluorescent Behaviorsupporting

confidence: 82%

Gas Response Behaviour and Photochemistry of Borondiketonate in Acrylic Polymer Matrices for Sensing Applications

et al. 2014

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“…This behavior could also be observed for other polymer matrices, such as polystyrene. 39 In the case of the Zeonex film, however, the τ f value simply increased with decreasing thickness. Thus, it is clear that the thickness dependence of τ f for NBD depends on which type of polymer is used as the matrix.…”

Section: Effect Of Interfacial Mobility On Fluorescence Propertiesmentioning

confidence: 94%

“…To address this issue, we investigated the fluorescence behavior of the dye 6-(N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino)hexanoic acid (NBD) dispersed in polymer films with various film thicknesses. 39 PMMA and Zeonex were used as typical polar and non-polar polymer matrices, respectively. The polarity of the polymer matrix is closely related to the miscibility between the polymer and NBD dye.…”

Section: Effect Of Interfacial Mobility On Fluorescence Propertiesmentioning

confidence: 99%

Dynamic structure and functionalization of polymer interfaces

Shundo

2015

Polym J

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The segmental mobility of polymers at an interface in contact with air, a liquid or a solid is considerably different from that in the internal bulk phase. This review summarizes recent studies offering a concept that the polymer interface is a useful medium for the functionalization of solid polymer materials. Time-and space-resolved fluorescence spectroscopy using evanescent wave excitation revealed that the segmental mobility at the surface and the solid interface had a strong impact on the fluorescence properties of a dye well dispersed in a polymer film when the film thickness decreased. Furthermore, using a chiral polymer designed from the concept of a dynamic interface, enantioselective wetting was successfully demonstrated. The contact angle of chiral liquids on the film varied depending on the chirality of the liquid. This wetting resulted from the enantioselective surface reorganization involving local conformational changes of the polymer chains at the liquid interface, as confirmed using sum frequency generation vibrational spectroscopy.

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“…C153 was dissolved and thoroughly mixed with PI/toluene and NBR/tetrahydrofuran (THF) solutions. The molar ratio of C153 to a repeating unit of polymers was ≈3 × 10 −2 mol% to ensure a well‐dispersed state of C153 in the polymer matrices . PI and NBR films with a thickness of ≈2 µm containing C153 were prepared by solvent‐casting their solutions onto S‐LAH79 prisms.…”

Section: Methodsmentioning

confidence: 99%

“…The molar ratio of C153 to a repeating unit of polymers was ≈3 × 10 −2 mol% to ensure a well-dispersed state of C153 in the polymer matrices. [28] PI and NBR films with a thickness of ≈2 µm containing C153 were prepared by solvent-casting their solutions onto S-LAH79 prisms. The films were then dried in a vacuum for 24 h at room temperature (298 K), well above their bulk T g , to remove residual solvents.…”

Section: Time-resolved Fluorescence Anisotropymentioning

confidence: 99%

Rotational Dynamics of a Probe in Rubbery Polymers Characterized by Time‐Resolved Fluorescence Anisotropy Measurement

Nguyen

Konomi

Sugimoto

et al. 2017

Macro Chemistry & Physics

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The rotational relaxation time (τrot) of a fluorescent molecule, coumarin 153 (C153), dispersed in different rubbery polymers is characterized by time‐resolved fluorescence anisotropy measurement, and an attempt is made to quantitatively combine it with the segmental relaxation time (τseg) of the corresponding matrix polymer obtained by dielectric relaxation spectroscopy. This study here demonstrates that τseg extrapolated to higher temperatures using the Vogel–Fulcher–Tammann law can be superimposed on τrot, resulting in a single curve. This behavior is common for polymers with different glass transition temperatures such as polyisoprene and acrylonitrile/butadiene copolymer, implying that the rotational dynamics of C153 is a useful tool for the characterization of polymer dynamics.

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Fluorescence Behavior of Dyes in Thin Films of Various Polymers

Cited by 35 publications

References 44 publications

Gas Response Behaviour and Photochemistry of Borondiketonate in Acrylic Polymer Matrices for Sensing Applications

Gas Response Behaviour and Photochemistry of Borondiketonate in Acrylic Polymer Matrices for Sensing Applications

Dynamic structure and functionalization of polymer interfaces

Rotational Dynamics of a Probe in Rubbery Polymers Characterized by Time‐Resolved Fluorescence Anisotropy Measurement

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