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Nardou E.,University Claude Bernard Lyon 1 | Nardou E.,Laboratoire Of Physico Chimie Des Materiaux Luminescents | Vouagner D.,University Claude Bernard Lyon 1 | Jurdyc A.-M.,University Claude Bernard Lyon 1 | And 5 more authors.
Journal of Non-Crystalline Solids | Year: 2011

In order to improve the efficiency of Raman Amplifiers, the Surface Enhanced Raman Scattering (SERS) effect of an amorphous matrix of TiO 2 was studied. First, optimisation of the amorphous layer quality was performed by depositing thin films on glass substrates at different temperatures. Then, thin films of amorphous TiO2 were deposited on silicon commercial gold SERS substrates (Klarite®) by a dip-coating process. The SERS effect was demonstrated by the great difference of Raman intensities of the amorphous TiO2 matrix dip-coated on active and inactive parts of Klarite® substrate under 633 nm and 780 nm laser excitations in the tail of the Surface Plasmon Resonance band of gold nanoparticles. © 2011 Elsevier B.V. All rights reserved.

Deschamps T.,University of Lyon | Deschamps T.,Laboratoire Of Physico Chimie Des Materiaux Luminescents | Martinet C.,Laboratoire Of Physico Chimie Des Materiaux Luminescents | De Ligny D.,Laboratoire Of Physico Chimie Des Materiaux Luminescents | And 2 more authors.
Journal of Non-Crystalline Solids | Year: 2012

Low frequency vibrations, a universal feature of amorphous solids which is responsible for thermodynamical anomalies at low temperature, are complicated to record in high pressure device, notably because of the closeness of the elastic line. We first present an experimental protocol allowing to record the in situ low-frequency Raman scattering of samples under high pressure in the diamond anvil cell apparatus with a high quality. This protocol is particularly adapted to study the evolution of the boson peak of glassy materials. The second part is dedicated to the study of the boson peak of a-GeO 2, a typical strong glass. The results, which clearly show the non-Debye behaviour of this material at the beginning of the compression where an anomalous compression takes place, are compared to previous measurements on a-SiO 2. Interpretation in terms of local structural transitions and discussions about the elastic nanoheterogeneities of the amorphous state are addressed. © 2012 Elsevier B.V.

Forissier S.,French National Center for Scientific Research | Forissier S.,Laboratoire Of Physico Chimie Des Materiaux Luminescents | Roussel H.,French National Center for Scientific Research | Chaudouet P.,French National Center for Scientific Research | And 3 more authors.
Journal of Thermal Spray Technology | Year: 2012

Thin films of thulium and ytterbium-doped titanium oxide were grown by metal-organic spray pyrolysis deposition from titanium(IV)oxide bis(acetylacetonate), thulium(III) tris(2,2,6,6-tetramethyl-3,5-heptanedionate) and ytterbium(III) tris(acetylacetonate). Deposition temperatures have been investigated from 300 to 600 C. Films have been studied regarding their crystallinity and doping quality. Structural and composition characterisations of TiO2:Tm,Yb were performed by electron microprobe, x-ray diffraction, and Fourier transform infrared spectroscopy. The deposition rate can reach 0.8 μm/h. The anatase phase of TiO2 was obtained after synthesis at 400 C or higher. Organic contamination at low deposition temperature is eliminated by annealing treatments. © 2012 ASM International.

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