نتایج جستجو برای: doped titania

تعداد نتایج: 51095  

Journal: :Nanoscale research letters 2016
Enzhu Li Ning Wang Hongcai He Haijun Chen

Nb-doped SrTiO3 ceramics doped with the surface modification of nanosized titania was prepared via liquid phase deposition approach and subsequent sintered in an Ar atmosphere. The surface modification of nanosized titania significantly improved the ratio of the electrical conductivity to thermal conductivity of SrTiO3 ceramic doped with Nb, and has little impact on the Seebeck coefficient, thu...

Journal: :Applied optics 2014
Matthew R Abernathy James Hough Iain W Martin Sheila Rowan Michelle Oyen Courtney Linn James E Faller

The current generation of advanced gravitational wave detectors utilize titania-doped tantala/silica multilayer stacks for their mirror coatings. The properties of the low-refractive-index silica are well known; however, in the absence of detailed direct measurements, the material parameters of Young's modulus and coefficient of thermal expansion (CTE) of the high refractive index material, tit...

1998
E. M. YEATMAN

Sol-gel is a promising deposition technique for the fabrication of silica-on-silicon photonic components. Silica-titania compositions provide large index differences, and thus strong mode confinement, and are suitable hosts for Er-doped optical amplifiers. We have developed channel waveguides based on phosphosilicate strip loads over high index titania-doped guiding layers. Here we demonstrate ...

2007
Seung-Jin Lee Ching-Hua Huang Georgia Samuel Shian Kenneth H. Sandhage

Three-dimensional microscale assemblies of fluorine-doped titania nanoparticles were synthesized from silica-based diatom microshells (frustules) via a shape-preserving reactive conversion process (as per the method of Unocic et al.). The nanostructured F-doped titania frustules were found to induce rapid hydrolysis of the organophosphorous esters, methyl paraoxon, and methyl parathion (insecti...

Journal: :Molecules 2017
Cristina Pablos Javier Marugán Rafael van Grieken Patrick Stuart Morris Dunlop Jeremy William John Hamilton Dionysios D Dionysiou John Anthony Byrne

TiO₂ photocatalysis is considered as an alternative to conventional disinfection processes for the inactivation of waterborne microorganisms. The efficiency of photocatalysis is limited by charge carrier recombination rates. When the photocatalyst is immobilized on an electrically conducting support, one may assist charge separation by the application of an external electrical bias. The aim of ...

2013
Nick Farahani Peter J. Kelly Vladimir Vishnyakov

The photocatalytic behavior of titania coatings is largely determined by their crystalline structure. Depending on deposition conditions, though, titania may form amorphous, brookite, anatase or rutile structures, with anatase or anatase/rutile mixed phase structures showing the highest levels of activity. Anatase is activated by UV light and, consequently, there is a great deal of interest in ...

2012
Václav Štengl Tomáš Matys Grygar Jiří Henych Martin Kormunda

UNLABELLED BACKGROUND The work aims at improving photocatalytic activity of titania under Vis light irradiation using modification by Sn ions and an original, simple synthesis method. Tin-doped titania catalysts were prepared by thermal hydrolysis of aqueous solutions of titanium peroxo-complexes in the presence of SnCl4 or SnCl2 using an original, proprietary "one pot" synthesis not employi...

2013
Vardan Galstyan Elisabetta Comini Guido Faglia Giorgio Sberveglieri

Synthesis--particularly by electrochemical anodization-, growth mechanism and chemical sensing properties of pure, doped and mixed titania tubular arrays are reviewed. The first part deals on how anodization parameters affect the size, shape and morphology of titania nanotubes. In the second part fabrication of sensing devices based on titania nanotubes is presented, together with their most no...

Journal: :Chemical communications 2009
Gang Liu Lianzhou Wang Chenghua Sun Zhigang Chen Xiaoxia Yan Lina Cheng Hui-Ming Cheng Gao Qing Max Lu

Nitrogen-doped titania nanosheets with visible light response were synthesized by exfoliating a layered titanate with homogeneous nitrogen doping.

2010
Ming-Show Wong Der-Shan Sun Hsin-Hou Chang

BACKGROUND Titania dioxide (TiO(2)) photocatalyst is primarily induced by ultraviolet light irradiation. Visible-light responsive anion-doped TiO(2) photocatalysts contain higher quantum efficiency under sunlight and can be used safely in indoor settings without exposing to biohazardous ultraviolet light. The antibacterial efficiency, however, remains to be further improved. METHODOLOGY/PRINC...

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