Repozitorij Univerze v Novi Gorici

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81.
Improved photocatalytic activity of anatase-rutile nanocomposites induced by low-temperature sol-gel Sn-modification of TiO2
Ksenija Maver, Iztok Arčon, Urška Lavrenčič Štangar, Mattia Fanetti, Saim Emin, Matjaž Valant, 2020, izvirni znanstveni članek

Opis: The Sn-modified TiO2 photocatalysts are prepared by low-temperature sol-gel processing based on organic titanium and tin precursors with varied Sn concentrations (from 0.1–20 mol .%). The role of Sn dopant as the promotor of the formation of TiO2 rutile crystalline phase is explained and the optimal Sn concentration for preparation of efficient Sn-modified titania photocatalyst is determined. Up to 40 % increase in photocatalytic activity is achieved in Sn-modified TiO2 photocatalytic thin films dried at 150 °C with low Sn concentrations in the range from 0.1 to 1 mol .%. At low Sn concentrations optimal ratio between anatase and rutile (nano)crystals is obtained, which facilitates charge separation at the TiO2 photocatalyst’s surface. When the concentration of Sn increases above 5 mol.% or when the films are calcined at 500 °C, the relative amount of rutile phase with inferior photocatalytic activity, increases and the nanocrystals of titania grow, leading to fewer active sites per unit mass and the reduction of activity in comparison to unmodified TiO2.
Ključne besede: Anatase-rutile Sn-modified TiO2 XAS analysis Photocatalytic activity
Objavljeno v RUNG: 10.02.2020; Ogledov: 2948; Prenosov: 0
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82.
Morphous aluminium oxide : a promising candidate for a photoanode protection layer
Andraž Mavrič, Chunhua Cui, Matjaž Valant, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: aluminium oxide, metal oxides, protection layers
Objavljeno v RUNG: 10.02.2020; Ogledov: 3331; Prenosov: 0
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83.
Amorphous alumina nanocomposite : the effect of surface, interface and bulk stress
Andraž Mavrič, Chunhua Cui, Matjaž Valant, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: alumina nanocomposite, surfaces
Objavljeno v RUNG: 10.02.2020; Ogledov: 2848; Prenosov: 0
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84.
85.
Capabilities of hydrogen-producing green algae Clamydomonas reinhardtii for copper bioremediation in wastewaters
Urška Žvab, Danijel Stojković, Matjaž Valant, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: copper, hydrogen, wastewater, green algae, Clamydomonas reinhardtii
Objavljeno v RUNG: 19.12.2019; Ogledov: 2907; Prenosov: 0
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86.
v-P[sub]2O[sub]5 "micro-clusters" in P-doped silica studied by a first principles Raman investigation
Luigi Giacomazzi, Layla Martin-Samos, Matjaž Valant, Nicolas Richard, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: r-POHC, silica, Raman, first-principles
Objavljeno v RUNG: 19.12.2019; Ogledov: 3103; Prenosov: 0
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87.
Interfacial reaction, morphology and growth mode of metals on topological insulator surfaces
Sandra Gardonio, Mattia Fanetti, Katja Ferfolja, Matjaž Valant, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: topological insulators, surfaces, metals
Objavljeno v RUNG: 19.12.2019; Ogledov: 3240; Prenosov: 0
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88.
Looking for a topological insulator in the tetradymite family
Zipporah Rini Benher, Sandra Gardonio, Mattia Fanetti, Polina M. Sheverdyaeva, Paolo Moras, Matjaž Valant, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: Materials that are topological insulators (TI) manifest a novel state for their electrons. They possess topological surface states that are not destroyed by the presence of non-magnetic impurities on their surfaces. This unique property lies in the bulk band structure and it is typically found in narrow gap semiconductor with strong spin-orbit coupling. Bi2Se3 and Bi2Te3 belong to the class of compounds called tetradymites and are considered as the 3D-prototypical TI materials. However, these compounds are not usually insulators but have metallic bulk conductivity as a consequence of intrinsic defect doping: vacancies and anti-site defects. For these reasons, it is difficult to electrically gate these materials for the manipulation and control of charge carriers for realizing devices. This led to the search for other topological materials, which might have better insulating behavior in their bulk. Theoretical studies have pointed out that ternary variants of the Bi2Se3 and Bi2Te3, such as Bi2Te2Se, Bi2Te2S, Bi2Se2S Sb2Te2Se and Sb2Te2S, should be stable TIs and potentially offer a chemical way to control TI behavior, in particular by lowering native doping. Among the cited ternary compounds, Bi2Se2S should manifest a genuine topological spin-transport regime hosting an isolated Dirac cone with the Dirac point in the gap as well. However, it has been poorly studied from the TI experimental perspective. Therefore, to uncover the full potential of the predicted topological electronic properties of the Bi-Se-S system, in this presentation we will revisit the crystallographic and electronic structure of Bi2Se3-Bi2S3 solid solutions. The combined use of bulk and surface sensitive techniques such as X-ray diffraction (XRD), low energy electron diffraction (LEED), scanning electron microscopy (SEM) with Energy Dispersive X-ray spectroscopy (EDX) and X-ray photoemission spectroscopy (XPS) was applied to analyze single crystal samples grown by us. The quality of the single crystals was suitable for rigorous measurement of the electronic properties by means of Angle Resolved Photoemission Spectroscopy. We unambiguously showed that within a certain solid solution range, the single crystals of Bi-Se-S have a rombohedral structure with the topological surface states as theoretically predicted.
Ključne besede: topological insulators, ternary tetradymite, electronic properties.
Objavljeno v RUNG: 19.12.2019; Ogledov: 3748; Prenosov: 0
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89.
A DNA origami plasmonic sensor with environment-independent read-out
Matjaž Valant, Mattia Fanetti, 2019, izvirni znanstveni članek

Ključne besede: DNA origami, plasmonic sensor, molecular detection, gold nanoparticle
Objavljeno v RUNG: 08.11.2019; Ogledov: 3043; Prenosov: 0
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90.
First-principles investigation of paramagnetic centers in P2O5 based glasses
Matjaž Valant, Luigi Giacomazzi, 2019, objavljeni znanstveni prispevek na konferenci

Ključne besede: glasses, phosphates, paramagnetic centers
Objavljeno v RUNG: 30.10.2019; Ogledov: 2854; Prenosov: 0
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