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Study of Photosensitivity and photoluminescence in organically modified silicates films prepared by sol-gel


Sol-gel method is a useful synthesis technology for preparing new functional materials such as glasses, films, and dense ceramics or fine powders at room temperature. Through this wet chemical method, organic/inorganic compounds (rare earth/organic complexes and organic laser dyes) can be successfully doped into SiO2 sol and gel matrix to prepare novel materials for optical and optoelectronic applications. Organically Modified Silicates (ORMOSIL) are extensively studied due to the great variety of silicon alkoxides functionalized with organic molecules (epoxy, vinyl, amine, phenyl, etc) allowing production of new silica matrix with adjustable properties by embedding organic molecules into the SiO2 structure. Recent results showed that ORMOSIL matrix obtained from 3-Glicidoxipropyltrimetoxisilane (GPTS) and Viniltrietoxisilane (VTES) associated with Tetraethylorthosilicate (TEOS) are excellent hosts to photosensible azodyes and photoluminescent chromophores. The study of Organic/Silica hybrid Films doped with Photosensible Azodyes and Photoluminescent Chromophores prepared by sol-gel is of high scientific and technological interest due to its optical and mechanical properties which can be tailored from the sol-gel synthesis yielding novel functional materials possessing hybrid characteristics arising from the organic/silica synergistic interaction associated to the optical phenomena created by the dopant introduced in the new matrix. The goal of this project is: 1) The study of hybrid films of GPTS and VTES associated to TEOS doped with azodyes (DR1, DR13, MR, MO) and the investigation of the photoinduced effects characterized by UV-VIS optical absorption and ellipsometry. 2) The study of hybrid films of GPTS and VTES associated to TEOS doped with photoluminescent chromophores (Eu3+, Tb3+) and the investigation of the luminescence by UV-VIS photoluminescence and optical absorption techniques, and ellipsometry. 3) Improvement in the infrastructure for films preparation in a dry glove-box chamber with controlled atmosphere, yielding films with superior surface quality. (AU)

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Scientific publications (13)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FRESCHI, A. A.; DE VICENTE, F. S.. Short-time kinetics of photorefractive gratings recorded under active phase control: an experimental method to materials characterization. APPLIED PHYSICS B-LASERS AND OPTICS, v. 126, n. 1, . (11/18149-5)
VOLLET, DIMAS R.; BARREIRO, LUIZ A.; PACCOLA, CARLOS E. T.; AWANO, CARLOS M.; DE VICENTE, FABIO S.; YOSHIDA, MAKOTO; DONATTI, DARIO A.. A kinetic modeling for the ultrasound-assisted and oxalic acid-catalyzed hydrolysis of 3-glycidoxypropyltrimethoxysilane. Journal of Sol-Gel Science and Technology, v. 80, n. 3, p. 873-880, . (11/18149-5)
PACCOLA, CARLOS E. T.; AWANO, CARLOS M.; DE VICENTE, FABIO S.; DONATTI, DARIO A.; YOSHIDA, MAKOTO; VOLLET, DIMAS R.. Kinetics of Oxalic Acid Catalyzed and Ultrasound-Assisted Hydrolysis of 3-Glycidoxypropyltrimethoxysilane and Structural Characteristics of the Resulting Aged Sonogels. Journal of Physical Chemistry C, v. 119, n. 33, p. 19162-19170, . (11/18149-5)
DE VICENTE, FABIO S.; MORENO, LEANDRO X.; PRADO, MARCUS V. A.; ABEGAO, LUIS M. G.; MELO, LEANDRO A.; RODRIGUES JR, JOSE J.; ALENCAR, MARCIO A. R. C.. Tunable random lasing in dye-doped mesoporous silica SBA-15. PHYSICAL REVIEW MATERIALS, v. 5, n. 2, . (11/18149-5)
FRESCHI, A. A.; DE VICENTE, F. S.; MELLO, T. B.; DONATTI, D. A.; VOLLET, D. R.. Running holograms in azopolymer films. APPLIED PHYSICS B-LASERS AND OPTICS, v. 111, n. 1, p. 103-109, . (11/18149-5)
VOLLET, DIMAS ROBERTO; BARREIRO, LUIZ ANTONIO; AWANO, CARLOS MIRANDA; DE VICENTE, FABIO SIMOES; YOSHIDA, MAKOTO; DONATTI, DARIO ANTONIO. Rod-like particles growing in sol-gel processing of 1:1 molar mixtures of 3-glycidoxypropyltrimethoxysilane and tetraethoxysilane. JOURNAL OF APPLIED CRYSTALLOGRAPHY, v. 50, n. 2, p. 489-497, . (11/18149-5)
PERISSINOTTO, AMANDA P.; AWANO, CARLOS M.; DE VICENTE, FABIO S.; DONATTI, DARIO A.; MESQUITA, ALEXANDRE; DA SILVA, LUIS F.; VOLLET, DIMAS R.. Structure and diffuse-boundary in hydrophobic and sodium dodecyl sulfate-modified silica aerogels. Microporous and Mesoporous Materials, v. 223, p. 196-202, . (11/18149-5)
DE VICENTE, F. S.; SANTOS, F. A.; SIMOES, B. S.; DIAS, S. T.; SIU LI, M.. EPR, optical absorption and luminescence studies of Cr3+-doped antimony phosphate glasses. Optical Materials, v. 38, p. 119-125, . (11/18149-5)
ALENCAR, LORENA D. S.; PILLA, VIVIANE; ANDRADE, ACACIO A.; DONATTI, DARIO A.; VOLLET, DIMAS R.; DE VICENTE, FABIO S.. High fluorescence quantum efficiency of CdSe/ZnS quantum dots embedded in GPTS/TEOS-derived organic/silica hybrid colloids. Chemical Physics Letters, v. 599, p. 63-67, . (11/18149-5)
FRESCHI, A. A.; CALLEGARI, F. A.; DE VICENTE, F. S.; GESUALDI, M. R. R.. Sign of the dominant charge carriers in photorefractive crystals determined by a phase-locked holographic technique. Optical Materials, v. 48, p. 247-251, . (11/18149-5)
PERISSINOTTO, AMANDA P.; AWANO, CARLOS M.; DONATTI, DARIO A.; DE VICENTE, FABIO S.; VOLLET, DIMAS R.. Mass and Surface Fractal in Supercritical Dried Silica Aerogels Prepared with Additions of Sodium Dodecyl Sulfate. Langmuir, v. 31, n. 1, p. 562-568, . (11/18149-5)
MONTEIRO, DANIELA A.; GOZZI, GIOVANI; CHINAGLIA, DANTE LUIS; OLIVEIRA, JR., OSVALDO N.; DE VICENTE, FABIO S.. Proton conduction mechanisms in GPTMS/TEOS-derived organic/silica hybrid films prepared by sol-gel process. Synthetic Metals, v. 267, . (11/18149-5, 13/14262-7)
FERMINO, TAINA Z.; AWANO, CARLOS M.; MORENO, LEANDRO X.; VOLLET, DIMAS R.; DE VICENTE, FABIO S.. Structure and thermal stability in hydrophobic Pluronic F127-modified silica aerogels. Microporous and Mesoporous Materials, v. 267, p. 242-248, . (11/18149-5)

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