1. The role of lattice defects on the optical properties of TiO[sub]2 nanotube arrays for synergistic water splittingManel Machreki, Takwa Chouki, Georgi Tyuliev, Mattia Fanetti, Matjaž Valant, Denis Arčon, Matej Pregelj, Saim Emin, 2023, izvirni znanstveni članek Opis: In this study, we report a facile one-step chemical method to synthesize reduced titanium dioxide (TiO2) nanotube arrays (NTAs) with point defects. Treatment with NaBH4 introduces oxygen vacancies (OVs) in the TiO2 lattice. Chemical analysis and optical studies indicate that the OV density can be significantly increased by changing reduction time treatment, leading to higher optical transmission of the TiO2 NTAs and retarded carrier recombination in the photoelectrochemical process. A cathodoluminescence (CL) study of reduced TiO2 (TiO2–x) NTAs revealed that OVs contribute significantly to the emission bands in the visible range. It was found that the TiO2 NTAs reduced for a longer duration exhibited a higher concentration of OVs. A typical CL spectrum of TiO2 was deconvoluted to four Gaussian components, assigned to F, F+, and Ti3+ centers.
Ključne besede: TiO2 nanotubes, defects, cathodoluminescence
Objavljeno v RUNG: 13.12.2023; Ogledov: 1350; Prenosov: 9
 Celotno besedilo (5,75 MB)
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2. O[sub]2 loaded germanosilicate optical fibers : experimental in situ investigation and ab initio simulation study of GLPC evolution under irradiationImène Reghioua, Luigi Giacomazzi, Antonino Alessi, Blaž Winkler, Layla Martin-Samos, Sylvain Girard, Diego Di Francesca, Mattia Fanetti, Nicolas Richard, Matjaž Valant, 2022, izvirni znanstveni članek Ključne besede: optical fiber, O2 loading, point defects
Objavljeno v RUNG: 25.04.2022; Ogledov: 2516; Prenosov: 30
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3. Unravelling the P[sub]3 centers origin in alkali phosphate glassesLuigi Giacomazzi, Nikita S. Shcheblanov, Layla Martin-Samos, Matjaž Valant, Nadege Ollier, Nicolas Richard, 2021, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: EPR, DFT, NaPO3, LiPO3, alkali phosphate glasses, point defects
Objavljeno v RUNG: 29.09.2021; Ogledov: 2690; Prenosov: 9
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4. Unravelling the P[sub]3 centers origin in alkali phosphate glassesLuigi Giacomazzi, Nikita S. Shcheblanov, Layla Martin-Samos, Matjaž Valant, Nadege Ollier, Nicolas Richard, 2021, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: EPR, DFT, NaPO3, LiPO3, alkali phosphate glasses, point defects
Objavljeno v RUNG: 29.09.2021; Ogledov: 2781; Prenosov: 0
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5. Paramagnetic intrinsic point defects in alkali phosphate glasses : unraveling the P[sub]3 center origin and local environment effectsLuigi Giacomazzi, Nikita S. Shcheblanov, Layla Martin-Samos, Mikhail E. Povarnitsyn, Shinji Kohara, Matjaž Valant, Nicolas Richard, Nadege Ollier, 2021, izvirni znanstveni članek Ključne besede: oxygen, electron paramagnetic resonance spectroscopy, phosphates, amorphous materials, defects
Objavljeno v RUNG: 04.05.2021; Ogledov: 3744; Prenosov: 0
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6. Vers une connaissance microscopique de la structure de verres de phosphate P2O5Nicolas Richard, Luigi Giacomazzi, Nikita S. Shcheblanov, Layla Martin-Samos, Nadege Ollier, 2020, poljudni članek Opis: Les propriétés d’amplification de la lumière des ions terres rares permettent en les incluant comme dopants dans le cœur des fibres optiques d’obtenir des sources laser et des amplificateurs de lumière compacts. Pour réduire la tendance à l’agrégation des terres rares qui diminuent leurs propriétés amplificatrices, le phosphore est employé comme co-dopant dans ces fibres. Cet article montre comment les méthodes de simulation à l’échelle atomique
peuvent aider a' l'optimisation de ce co-dopage en contribuant a' une meilleure comprehension de la structure des verres phosphates
[1] et des défauts qui leur sont liés [2]. Au CEA-DAM, ces resultats serviront aussi dans le cadre d'etudes sur le developpement de fibres optiques pour des mesures de dosimetrie radiative.
Ključne besede: glasses, P2O5, point defects, ab-initio
Objavljeno v RUNG: 18.09.2020; Ogledov: 4233; Prenosov: 0
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8. Overview of radiation induced point defects in silica-based optical fibersSylvain Girard, Antonino Alessi, Vincenzo De Michele, Youcef Ouerdane, A. Boukenter, Adriana Morana, Nicolas Richard, Philippe Paillet, Marco Cannas, Simonpietro Agnello, Imène Reghioua, Blaz Winkler, Layla Martin-Samos, Luigi Giacomazzi, Diego Di Francesca, Thierry Robin, 2019, pregledni znanstveni članek Ključne besede: optical fibers, point defects, radiation-induced attenuation, GLPC, NBOHC, STH, ODC, P-doping, Ge-doping, Al-doping
Objavljeno v RUNG: 09.05.2019; Ogledov: 4189; Prenosov: 0
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9. Radiation Effects on Optical Fibers and Fiber-Based SensorsSylvain Girard, A. Boukenter, Youcef Ouerdane, Nicolas Richard, Philippe Paillet, Layla Martin-Samos, Luigi Giacomazzi, Claude Marcandella, 2015, samostojni znanstveni sestavek ali poglavje v monografski publikaciji Ključne besede: Optical Fibers, radiation-induced point defects, dosimetry, ab-initio
Objavljeno v RUNG: 24.10.2018; Ogledov: 4714; Prenosov: 0
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