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15 Result(s)

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  1. No Access

    Article

    Nanocomposites of titania and hybrid matrix with high refractive index

    A sol–gel route for TiO2 nanocrystals (NCs) synthesis has been developed at low temperature without surfactants. Synthetic and processing parameters have been optimized to maximize particles’ colloidal stability ...

    A. Antonello, G. Brusatin, M. Guglielmi, V. Bello… in Journal of Nanoparticle Research (2011)

  2. No Access

    Article

    Porous sol gel silica films doped with crystalline NiO nanoparticles for gas sensing applications

    A reliable sol gel route to synthesize NiO doped SiO2 films with different NiO content is here described. The films showed detectable and reversible changes in both optical and electrical properties when exposed ...

    D. Buso, M. Guglielmi, A. Martucci… in Journal of Sol-Gel Science and Technology (2006)

  3. No Access

    Article

    Optical Gas Sensing Properties of Silica Film Doped with Cobalt Oxide Nanocrystals

    SiO2 sol-gel films doped with cobalt oxide nanocrystals have been fabricated. The nanocrystals precipitate in the glass film at 500_°C, while the film is still porous. The nanocomposite films showed a reversible ...

    A. Martucci, D. Buso, M. Guglielmi… in Journal of Sol-Gel Science and Technology (2004)

  4. No Access

    Article

    Photoluminescence Spectroscopy of Er3+/Yb3+ Co-Activated Silica-Alumina Monolithic Xerogels

    Two Er3+/Yb3+ monolithic silica-alumina xerogels doped with different Yb3+ concentrations were prepared by sol–gel route. The samples were thermally treated in air at 950°C for 120 h, and Raman and UV-visible-NIR...

    C. Armellini, A. Chiasera, S. Dirè, M. Ferrari… in Journal of Sol-Gel Science and Technology (2004)

  5. No Access

    Article

    Ion Beam Induced Conversion of Si-Based Polymers and Gels Layers into Ceramics Coatings

    The transformations induced by ion irradiation in films of polycarbosilane and gels derived from tetraethoxysilane, methyltriethoxysilane and triethoxysilane have been studied. Hydrogen is released selectively...

    J.C. Pivin, P. Colombo, A. Martucci… in Journal of Sol-Gel Science and Technology (2003)

  6. No Access

    Article

    NiO-SiO2 Sol-Gel Nanocomposite Films for Optical Gas Sensor

    Recently nanocomposites with sensoring function are becoming a new area of interest in the field of optical gas sensor. In fact, the optical transmittance of nano-particles or thin films has been reported to b...

    A. Martucci, N. Bassiri, M. Guglielmi… in Journal of Sol-Gel Science and Technology (2003)

  7. No Access

    Article

    Nucleation of Titania Nanocrystals in Silica Titania Waveguides

    SiO2(1 − x)-TiO2(x) monomode waveguides at 632.8 nm, with x in the range 0.07–0.2 and thickness of about 0.4 μm, were deposited on silica substrates by a dip-coating technique. Nucleation of TiO2 nanocrystals and...

    M. Montagna, E. Moser, F. Visintain… in Journal of Sol-Gel Science and Technology (2003)

  8. No Access

    Article

    Fabrication of Erbium-Doped Channel Waveguides by a Combination of Ion Exchange and Sol-Gel Techniques

    Erbium-doped germano-silicate thin films of good optical quality were produced by the sol-gel technique. High refractive index changes of up to 0.018 were obtained by sodium-silver ion exchange. Monomode optic...

    J. Fick, A. Martucci, M. Guglielmi in Journal of Sol-Gel Science and Technology (2000)

  9. No Access

    Article

    Sol-Gel Fabrication of Rare-Earth Doped Photonic Components

    The use of sol-gel to fabricate silica-on-silicon waveguides, and particularly erbium-doped waveguide amplifiers, is reviewed. In particular, efforts to use sol-gel to improve molecular homogeneity in heavily ...

    E.M. Yeatman, M.M. Ahmad, O. McCarthy… in Journal of Sol-Gel Science and Technology (2000)

  10. No Access

    Article

    Preparation and Characterization of HgxCd1-xS and PbxCd1-xS Quantum Dots and Doped Thin Films

    Thin silica and silica-titania films doped with sulfide nanocrystals of controlled size were fabricated by a method based on the preparation of colloidal particles and their introduction into a glassy matrix t...

    M. Guglielmi, A. Martucci, J. Fick, G. Vitrant in Journal of Sol-Gel Science and Technology (1998)

  11. No Access

    Article

    Influence of the Host Matrix on the Microstructure of Sol-Gel Films Doped with CdS and PbS Q-Dots

    The preparation of non-linear optical materials for integrated photonic devices needs the development of procedures which permit a very good control of the microstructure. Sol-gel is a good method for the prep...

    A. Martucci, M. Guglielmi, K. Urabe in Journal of Sol-Gel Science and Technology (1998)

  12. No Access

    Article

    Spinning deposition of silica and silica-titania optical coatings: A round robin test

    A round robin test has been performed on sol-gel processing for the deposition of silica and silica-titania films on silicon substrates by spin-coating. Three solution preparation processes for silica coatings...

    M. Guglielmi, A. Martucci, R. M. Almeida… in Journal of Materials Research (1998)

  13. No Access

    Article

    Fabrication and Characterization of Sol-Gel GeO2-SiO2Erbium-Doped Planar Waveguides

    GeO2-SiO2 sol-gel planar waveguides doped with Er were deposited by spinning on silica substrates. P2 O5 or Al2O3 were used as co-dopants to improve erbium dissolution in the GeO2-SiO2 matrix. Multilayer amorp...

    A. Martucci, G. Brusatin, M. Guglielmi… in Journal of Sol-Gel Science and Technology (1998)

  14. No Access

    Article

    Control of semiconductor particle size in sol-gel thin films

    Thin silica and silica-titania films containing CdS and PbS quantum size particles were obtained by separate preparation of the matrix and the colloidal sols and successive mixing. Sulfide particles were obtai...

    M. Guglielmi, A. Martucci, E. Menegazzo… in Journal of Sol-Gel Science and Technology (1997)

  15. No Access

    Article

    Control of Semiconductor Particle Size in Sol-Gel Thin Films

    Thin silica and silica-titania films containing CdS and PbS quantum size particles were obtained by separate preparation of the matrix and the colloidal sols and successive mixing. Sulfide particles were obtai...

    M. Guglielmi, A. Martucci, E. Menegazzo… in Journal of Sol-Gel Science and Technology (1997)