41. Au and Ag on the Bi2Se3(0001) Surface: Experimental Electronic and Physical PropertiesSandra Gardonio, Mattia Fanetti, Katja Ferfolja, Matjaž Valant, objavljeni povzetek znanstvenega prispevka na konferenci Opis: Binary bismuth chalcogenides, Bi2Se3 and Bi2Te3, have been extensively studied as reference topological
insulators (TIs). These materials are bulk insulators with topological surface states (TSS) crossing the
Fermi level. In contrast to conventional surface states of metals, the TSS are extremely robust
against local modifications at the surface, such as adsorbed adatoms, localized defects or changes in the surface termination. This aspect makes the TIs attractive for applications in spintronics, plasmonics, quantum computing and catalysis.
A theoretical model of charge transport by the TI surface states predicts that the TSS survive, provided that bonding at the metal/TI interface is weak. Ab-initio calculations have been done to understand the electronic properties of Au, Ni, Pt, Pd and graphene layers in a contact with Bi2Se3. These calculations showed that for Au and graphene the spin-momentum locking of TSS is maintained at the interface. In another theoretical study, Ag and Au thin layers on Bi2Se3 have been predicted to show a large Rashba splitting and a high spin polarization of the Ag quantum wells, providing a great potential for development of the spintronic devices. Finally, the calculations have foreseen that the presence of the robust TSS affects the adsorption properties of metals (Au bi-layer and clusters of Au, Ag, Cu, Pt, and Pd) supported on TI, in some cases resulting in the enhancement of the catalytic processes.
Despite the fundamental importance of the metal/TI interfaces and a number of theoretical studies
predicting exotic interfacial phenomena, the experimental knowledge about the metals on the TI surfaces is surprisingly limited, especially concerning combined study of morphology, growth mode, electronic and chemical properties.
In order to exploit the predicted physical properties of such systems, it is especially important to extend the study above the diluted coverage regime and to understand what is the growth morphology of the metal on the TI surface, to what extent the metal overlayer interacts with the TI substrate, how the TSS change with the presence of the metal overlayer and what is the reactivity of the system at the different stages of the overlayer growth.
Within this frame, we present a comprehensive surface sensitive study, of Au and Ag on Bi2Se3 by means of ARPES, XPS, SEM, LEED and XRD. The obtained results allow us to discuss the relation between electronic and physical properties at two of the most important model metal/TI interfaces
Ključne besede: topological insulator, electronic properties, synchrotron radiation
Objavljeno v RUNG: 27.06.2019; Ogledov: 3953; Prenosov: 0
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42. Cu and Zr surface sites in photocatalytic activity of TiO [sub] 2 nanoparticles : the effect of Zr distributionOlena Pliekhova, O. L. Pliekhov, Mattia Fanetti, Iztok Arčon, Nataša Novak Tušar, Urška Lavrenčič Štangar, 2019, izvirni znanstveni članek Opis: The present work is focused on the role of ZrO2 modification in the performance of CuO modified TiO2. Zirconia
loading leads to formation of more resistant photocatalytic layers compared to samples modified with only
copper containing species. Surface modification of mixed phase TiO2 with CuO/ZrO2 improves the degradation
of Reactive blue 19 dye under simulated solar irradiation. An in-depth investigation of the catalysts showed that
in case of CuO/ZrO2 modification, the covering of the TiO2 surface with zirconium containing species prevents
morphological and harmful energetic changes induced by copper species formed on the rutile TiO2 phase at a
higher copper loading.
Ključne besede: titanium dioxide, surface modification, XAS analysis, surface acidity, Hammett indicators
Objavljeno v RUNG: 26.03.2019; Ogledov: 3728; Prenosov: 0
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45. Scanning Photoelectron Spectro‐Microscopy: A Modern Tool for the Study of Materials at the NanoscalePatrick Zeller, Matteo Amati, Hikmet Sezen, Mattia Scardamaglia, Claudia Struzzi, Carla Bittencourt, Gabriel Lantz, Mahdi Hajlaoui, Evangelos Papalazarou, Marino Marsi, Mattia Fanetti, Stefano Ambrosini, Silvia Rubini, Luca Gregoratti, 2018, pregledni znanstveni članek Ključne besede: Scanning photoemission microscopy, graphene, GaAs, nanowires, Fermi Level, Mott-Hubbard transition
Objavljeno v RUNG: 07.12.2018; Ogledov: 4278; Prenosov: 0
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46. Growth, morphology and stability of Au in contact with the Bi[sub]2Se[sub]3(0 0 0 1) surfaceMattia Fanetti, Iuliia Mikulska, Katja Ferfolja, Paolo Moras, Polina M. Sheverdyaeva, M. Panighel, A. Lodi-Rizzini, I. Píš, S. Nappini, Matjaž Valant, Sandra Gardonio, 2018, izvirni znanstveni članek Ključne besede: metal contact, topological insulator contact, growth mode, electronic properties, chemical properties, photoemission spectroscopy, microscopy
Objavljeno v RUNG: 05.12.2018; Ogledov: 4316; Prenosov: 0
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49. The effect of Zr loading on photocatalytic activity of Cu modified TiO2Olena Pliekhova, O. L. Pliekhov, Mattia Fanetti, Iztok Arčon, Nataša Novak Tušar, Urška Lavrenčič Štangar, 2018, objavljeni znanstveni prispevek na konferenci Ključne besede: Titanium diokside, acidic sites, surface titration, copper, zirconium
Objavljeno v RUNG: 10.09.2018; Ogledov: 4536; Prenosov: 0
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