Influence of Film Structure and Precursor Composition on Rhodamine B Retention in Dye-Dopped Ormosils

Uricanu, V.I.; Donescu, Dan; Banu, A.G.; Şerban, S.; Vasilescu, Marilena; Olteanu, Mihaela; Dudau, Manuela

doi:10.1007/s10971-005-1259-7

Cited by 14 publications

(26 citation statements)

References 29 publications

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“…reported the spectral narrowing in dye doped polymeric photonic crystals [12] where the FWHM of the emission spectrum reduced to 15 nm but a clear threshold for spectral narrowing was not observed as in the present case. The photostability characteristics of a dye entrapped in a colloidal sphere are different from the dyes infiltrated through solution chemistry [13].…”

Section: Resultsmentioning

confidence: 96%

Laser emission from self-assembled active photonic crystal matrix

et al. 2010

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Abstract. Three-dimensionally ordered photonic crystals were grown using self-assembly technique from Rhodamine-B dye doped polystyrene micro-spheres resulting in a stop band at 611 nm overlapping the emission spectrum of the dye. When excited at a wavelength away from the stop band, using a frequency-doubled Nd:YAG laser, the crystal showed angledependent suppression of spontaneous emission of the dye in the wavelength range of the photonic stop band and enhancement at the band edge, in reflection and transmission geometries. Spectral narrowing, a sharp threshold and a highly directional emission, all indicative of stimulated emission, were observed from the active photonic crystal matrix.

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Section: Resultsmentioning

confidence: 96%

Laser emission from self-assembled active photonic crystal matrix

et al. 2010

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“…%. Since the dye is entrapped inside the sphere, its photostability can be greatly modified as compared with dyes infiltrated through solution chemistry, 17 and hence this limitation is overcome. This is very important for designing lasers using the photonic band gap concept.…”

Section: Introductionmentioning

confidence: 99%

Emission studies on photonic crystals fabricated using dyed polystyrene colloids

Nair

Vijaya

Kuroda

et al. 2007

Journal of Applied Physics

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Three dimensionally ordered photonic crystals are fabricated with rhodamine B dyed polystyrene colloidal spheres using the inward growing self-assembling method in less than 3 h. This avoids the difficulties due to infiltration of active materials into passive photonic crystals. The superior optical quality of the photonic crystals fabricated using this method results in high reflectance values even at large angles of incidence. The study of emission characteristics on these functionalized photonic crystals shows a clear trend dependent on the angle of emission, wavelength, and the angle-resolved transmittance. The dip observed in the emission spectrum clearly matches the photonic stop band position at different angles of observation. The emission spectrum measured at different angles was found to follow a simple functional form related to the intrinsic emission of the dye and the stop band effect due to the photonic crystal environment.

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“…In our earlier work, 23 using different RTES precursors, we found that polymer-free composites with MeTES and TIP have a very regular structure (made from spherical granules with a diameter around 46 nm) and a high resistance against washing with solvent. Because of the special composition, i.e., a compact silica-rich core surrounded by a more porous shell with a predominant TiO 2 composition, dye incorporation and retention are exceptionally good.…”

Section: Resultsmentioning

confidence: 95%

“…Because of the special composition, i.e., a compact silica-rich core surrounded by a more porous shell with a predominant TiO 2 composition, dye incorporation and retention are exceptionally good. As evidenced by transmission electron microscopy, 23 for preparations made only with MeTES, the porous shell does not exist and washing with water/acetone induces a small removal of dye.…”

Section: Resultsmentioning

confidence: 99%

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Filmogen organic–inorganic hybrids obtained by sol–gel in the presence of cationic polymer

Donescu

Şerban

Uricanu

et al. 2007

J of Applied Polymer Sci

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Self-standing and coated-on-glass films were prepared from polymer-inorganic ormosils, using the cationic polymer poly(methacrylamide propyl quaternarydimethyldodecyl bromide). The inorganic compound was grown in sol-gel reactions based on methyltriethoxysilane (MeTES), with or without addition of the titanium-precursor: tetraisopropyl orthotitanate. As evidenced by thermogravimetric analysis and differential scanning calorimetry data, the thermal properties of the films are highly dependent on the internal morphology. Inorganic granules with a TiO 2 rich shell have a more polar surface, which stimulates stronger electrostatic interactions with the polymer, hence, a reduced mobility for the amino end and a smaller probability to have amino ends engaged in interactions at the surface of the granules. Coated-on-glass films drawn from pure cationic polymer suffer from partial dewetting. Topographic and force-versus-distance recordings using atomic force microscopy showed a change in the energy balance and no dewetting regions were encountered for polymer/MeTES based composites. However, because of nongrafted polymer, these films are not immune at washing with water/ acetone. Explorations of antibacterial activity against the gram-negative bacteria, Pseudomonas aeruginosa, were done using ormosil films with alkoxysilanes combinations.

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Influence of Film Structure and Precursor Composition on Rhodamine B Retention in Dye-Dopped Ormosils

Cited by 14 publications

References 29 publications

Laser emission from self-assembled active photonic crystal matrix

Laser emission from self-assembled active photonic crystal matrix

Emission studies on photonic crystals fabricated using dyed polystyrene colloids

Filmogen organic–inorganic hybrids obtained by sol–gel in the presence of cationic polymer

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