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1.
Chemical and structural investigation of the cobalt phthalocyanine
Matija Stupar, 2015, magistrsko delo

Opis: In the last two decades, studies on organic molecules mimicking substances of fundamental importance in nature, like chlorophyll or hemoglobin, have attracted researchers’ attention. These molecules are building blocks for a family of materials also referred to as “organic semiconductors”. Such compounds can be implemented in numerous applications, ranging from data-storage to light harvesting. Some of their fundamental advantages include low cost, light weight, relatively easy engineering and mechanical flexibility, compatible with bending plastic substrates. In this thesis work we investigated the chemical, structural and electronic properties of cobalt phthalocyanines (CoPc). These molecules have promising applications in the field of magnetic data storage and spintronics in general, due to the ferromagnetic properties of the cobalt atom. Several techniques like photoemission core-level spectroscopy and valence band spectroscopy, together with X-ray absorption, have been used in order to determine the CoPc properties in gaseous phase, i.e. in the absence of interaction with the surrounding environment. Another set of experiments was devoted to the commissioning of the CITIUS time-resolved photoemission setup, that will be used in future studies of CoPc molecules on surfaces.
Najdeno v: ključnih besedah
Povzetek najdenega: ...and valence band spectroscopy, together with X-ray absorption, have been used in order to determine...
Ključne besede: Cobalt phthalocyanine (CoPc), photoemission spectroscopy (PES), X-ray absorption spectroscopy (XAS), synchrotron radiation, laser, high order harmonic generation (HHG), time resolved spectroscopy
Objavljeno: 29.09.2015; Ogledov: 3811; Prenosov: 180
.pdf Polno besedilo (2,96 MB)

2.
Operando (micro) XAFS analysis
Katarina Vogel-Mikuš, Robert Dominko, Iztok Arčon, 2016, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje)

Opis: In the talk the principles of XAS methods were presented with practical examples which illustrate the possibilities and advanced approaches for their use in structural analysis of different types of materials. The emphasis will be on to the use of XAS spectroscopy in operando mode and in combination with X-ray microscopy.
Najdeno v: ključnih besedah
Povzetek najdenega: ...X-ray absorption spectroscopy, X-ray microscopy, EXAFS, XANES, opearndo mode...
Ključne besede: X-ray absorption spectroscopy, X-ray microscopy, EXAFS, XANES, opearndo mode
Objavljeno: 25.03.2016; Ogledov: 2545; Prenosov: 47
.pdf Polno besedilo (18,40 MB)

3.
Complementarity of Galactic radio and collider data in constraining WIMP dark matter models
Yann Mambrini, Michel H.G. Tytgat, Gabrijela Zaharijas, Brzan Zaldívar, 2012, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...dark matter theory, dark matter experiments, absorption, radiation, ...
Ključne besede: dark matter theory, dark matter experiments, absorption, radiation
Objavljeno: 09.05.2017; Ogledov: 1208; Prenosov: 7
URL Polno besedilo (0,00 KB)

4.
Photocatalytic Activity of Zirconium- and Manganese- Codoped Titania in Aqueous Media: The Role of the Metal Dopant and its Incorporation Site
Nataša Novak Tušar, Iztok Arčon, O. L. Pliekhov, Urška Lavrenčič Štangar, 2016, izvirni znanstveni članek

Opis: The development of efficient TiO2-based photocatalysts for water treatment is mainly performed by doping with transition metals or by establishing junctions between different phases, metal–semiconductor or semiconductor–semiconductor. We present, for the first time, the synthesis of Zr- and Mn-modified TiO2 by a redesigned sol–gel technique that allows the formation of heterometallic bridges on the TiO2 surface. Cations of the doping metals are located in the pores of mesoporous anatase and attached to the crystalline TiO2 walls. The presence of the Zr enhances the photoactivity of the TiO2 catalyst. However, the introduction of Mn decreases the photocatalytic efficiency in a nonadditive manner. The inhibition effect was assigned to the side reaction between hydroxyl radicals and Mn ions. The fact that Mn effectively scavenges the hydroxyl radicals and, consequently, inhibits the whole oxidation process is direct proof that hydroxyl radicals are the main reactive species in the photocatalytic oxidative processes on TiO2 surfaces in aqueous media and the process of COH generation is the rate-determining step, which was confirmed using a method based on the decolorization of a commercial dye Bezaktiv Blau in a reaction with Fenton’s reagent as a source of hydroxyl radicals.
Najdeno v: ključnih besedah
Povzetek najdenega: ...doping, manganese, oxidation, X-ray absorption spectroscopy, zirconium...
Ključne besede: doping, manganese, oxidation, X-ray absorption spectroscopy, zirconium
Objavljeno: 21.07.2016; Ogledov: 1481; Prenosov: 0
.pdf Polno besedilo (577,49 KB)

5.
Operando characterization of batteries using x-ray absorption spectroscopy: advances at the beamline XAFS at synchrotron Elettra
Nicola Novello, Iztok Arčon, Lorenzo Stievano, Robert Dominko, marco Giorgetti, Giuliana Aquilanti, Luca Ivanc Olivieri, 2017, izvirni znanstveni članek

Opis: X-ray absorption spectroscopy is a synchrotron radiation based technique that is able to provide information on both local structure and electronic properties in a chemically selective manner. It can be used to characterize the dynamic processes that govern the electrochemical energy storage in batteries, and to shed light on the redox chemistry and changes in structure during galvanostatic cycling to design cathode materials with improved properties. Operando XAS studies have been performed at beamline XAFS at Elettra on different systems. For Li-ion batteries, a multiedge approach revealed the role of the different cathode components during the charge and discharge of the battery. In addition, Li-S batteries for automotive applications were studied. Operando sulfur K-edge XANES and EXAFS analysis was used to characterize the redox chemistry of sulfur, and to relate the electrochemical mechanism to its local structure.
Najdeno v: ključnih besedah
Ključne besede: operando studies, x-ray absorption spectroscopy, Li-ion batteries, Li-S batteries
Objavljeno: 03.03.2017; Ogledov: 3131; Prenosov: 0
.pdf Polno besedilo (1,59 MB)

6.
Design of a highly photocatalytically active ZnO/CuWO4 nanocomposite
Matjaz Valant, Saim Emin, 2017, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje)

Opis: We report the synthesis, photocatalytic activity and mechanistic study of a novel heterostructure (HTS) with an efficient charge separation. A ZnO/CuWO4 HTS material is reported for the first time. The nanocomposite (NC) consists of CuWO4 nanoparticles (ca. 200-400 nm) decorated with ZnO nanorods (ca. 30 nm, 100 nm length) and is shown to be a highly active photocatalyst for decomposition of model contaminants including methyl orange and terephthalic acid. The ZnO/CuWO4 interface is shown to be the key for controlling the enhanced activity of the composite material. Transient absorption spectroscopy studies demonstrated that a photoinduced charge transfer across the ZnO/CuWO4 interface increased electron-hole lifetime by 3 orders of magnitude, from < 20 s in ZnO to 30 ms in the ZnO/CuWO4 NC sample. Our findings show that through interface design efficient HTS materials can be prepared for a wide range of photocatalytic applications.
Najdeno v: ključnih besedah
Povzetek najdenega: ...enhanced activity of the composite material. Transient absorption spectroscopy studies demonstrated that a photoinduced charge...
Ključne besede: CuWO4, nanocomposite, transient absorption spectroscopy
Objavljeno: 28.08.2017; Ogledov: 1721; Prenosov: 0
.pdf Polno besedilo (621,87 KB)

7.
Edge profiles in K shell photoabsorption spectra of gaseous hydrides of 3p elements and homologues
Giuliana Aquilanti, Alojz Kodre, Iztok Arčon, Robert Hauko, Jana Padežnik Gomilšek, izvirni znanstveni članek

Opis: Photoabsorption spectra of gaseous hydrides of 3p elements (PH3, H2S, HCl) are measured in the energy region of photoexcitations pertaining to K edge. The analysis of the edge profile is extended to hydrides of 4p series (GeH4, AsH3, H2Se, HBr) from an earlier experiment, and to published spectra of 2p hydrides (CH4, NH3, H2O, HF) and noble gases Ar, Kr and Ne and SiH4. The edge profiles are modelled with a linear combination of lorentzian components, describing excitations to individual bound states and to continuum. Transition energies and probabilities are also calculated in the non-relativistic molecular model of the ORCA code, in good agreement with the experiment. Edge profiles in the heavier homologues are closely similar, the symmetry of the molecule governs the transitions to the lowest unoccupied orbitals. In 2p series the effect of the strong nuclear potential prevails. Transitions to higher, atomic-like levels remain very much the same as in free atoms.
Najdeno v: ključnih besedah
Povzetek najdenega: ...X-ray absorption spectra, gaseous hydrides, 3p K-edge spectra, DFT...
Ključne besede: X-ray absorption spectra, gaseous hydrides, 3p K-edge spectra, DFT
Objavljeno: 23.08.2017; Ogledov: 1157; Prenosov: 0
.pdf Polno besedilo (703,57 KB)

8.
New strategy for magnetic gas sensing
Roberta Ciprian, Piero Torelli, Angelo Giglia, B Gobaut, Barbara Ressel, Janez Štupar, Matija Stupar, Antonio Caretta, Giovanni De Ninno, Tommaso Pincelli, Barbara Casarin, Ganesh Adhikari, G Sberviglieri, C Baratto, Marco Malvestuto, 2016, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...hybrid nanostructures, sensor, absorption spectroscopy...
Ključne besede: hybrid nanostructures, sensor, absorption spectroscopy
Objavljeno: 05.02.2018; Ogledov: 1059; Prenosov: 0
.pdf Polno besedilo (2,25 MB)

9.
Giant magneto–electric coupling in 100 nm thick Co capped by ZnO nanorods
Giovanni Vinai, Barbara Ressel, Piero Torelli, Federico Loi, Benoit Gobaut, Regina Ciancio, Barbara Casarin, Antonio Caretta, Luca Capasso, Fulvio Parmigiani, Francesco Cugini, Massimo Solzi, Marco Malvestuto, Roberta Ciprian, 2018, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...ZnO nanorods, Cobalt, X-rays absorption near edge spectroscopy...
Ključne besede: ZnO nanorods, Cobalt, X-rays absorption near edge spectroscopy
Objavljeno: 07.02.2018; Ogledov: 1030; Prenosov: 0
.pdf Polno besedilo (3,44 MB)

10.
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