			Home About us Contact

Mesoporous Films (mesoporou + film)

Distribution by Scientific Domains

Polymers and Materials Science	50%

Selected Abstracts

Enhanced luminescence and two-photon absorption of silver nano-clusters

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue S1 2009
A. V. Aiboushev
Abstract Luminescence of silver nanoparticles photo-deposited on titan dioxide nanoparticles of mesoporous film is studied. Luminescence was registered under the two-photon excitation by femto-second laser pulses of Ti:sapphire laser. It was observed that Ag/ TiO2 mesoporous films have high concentration of bright luminescence spots which reveal stability to degradation under long illumination. Various configurations of silver nanoparticles are analyzed to explain the physics of bright luminescence spots ("hot spots"). Luminescence intensity reveals "hot spots" dependence on the polarization of excitation laser pulse. Properties of Ag/TiO2 system can be useful for single molecule spectroscopy and visualization of biological objects. Aapplication of Ag/ TiO2 mesoporous films for Raman scattering spectroscopy de-menstruated for the case of Rhodamine B. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Block-Copolymer-Templated Synthesis of Electroactive RuO2 -Based Mesoporous Thin Films

ADVANCED FUNCTIONAL MATERIALS, Issue 12 2009
Capucine Sassoye
Abstract RuO2 -based mesoporous thin films of optical quality are synthesized from ruthenium-peroxo-based sols using micelle templates made of amphiphilic polystyrene-polyethylene oxide block copolymers. The mesoporous structure and physical properties of the RuO2 films (mesoporous volume: 30%; pore diameter: ,30,nm) can be controlled by the careful tuning of both the precursor solution and thermal treatment (150,350,°C). The optimal temperature that allows control of both mesoporosity and nanocristallinity is strongly dependent on the substrate (silicon or fluorine-doped tin oxide). The structure of the resulting mesoporous films are investigated using X-ray diffraction, X-ray photoelectron spectroscopy, and atomic force microscopy. Mesoporous layers are additionally characterized by transmission and scanning electron microscopy and ellipsometry while their electrochemical properties are analyzed via cyclic voltammetry. Thick mesoporous films of ruthenium oxide hydrates, RuO2,·,xH2O, obtained using a thermal treatment at 280,°C, exhibit capacitances as high as 1000,±,100 F g,1 at a scan rate of 10,mV s,1, indicating their potential application as electrode materials. [source]

Cover Picture: Surfactant-Mediated Generation of Iso-Oriented Dense and Mesoporous Crystalline Metal-Oxide Layers (Adv. Mater.

ADVANCED MATERIALS, Issue 14 2006
14/2006)
Abstract For certain metal oxides (e.g., MoO3) ordered mesoporous films can be obtained with the nanocrystals in the pore walls being uniformly oriented with respect to the substrate by applying evaporation-induced self-assembly followed by heating. This surprisingly facile process, described by Smarsly and co-workers on p.,1827, works on different polar substrates (glass, metals, etc.) for oxides with anisotropic unit cells, based on the interaction with surfactants during nucleation ("soft-epitaxy"). [source]