A5015206574- 2D Materials and Applications
- Physics of Superconductivity and Magnetism
- Nuclear Physics and Applications
- Advanced Condensed Matter Physics
- Chalcogenide Semiconductor Thin Films
- Magnetic and transport properties of perovskites and related materials
- Particle accelerators and beam dynamics
- Advancements in Solid Oxide Fuel Cells
- Magnetic confinement fusion research
- Molecular Junctions and Nanostructures
- Electronic and Structural Properties of Oxides
- Catalysis and Oxidation Reactions
- MXene and MAX Phase Materials
- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Superconductivity in MgB2 and Alloys
- Radiation Therapy and Dosimetry
- Nuclear Materials and Properties
- Multiferroics and related materials
- Nuclear materials and radiation effects
- Iron-based superconductors research
- Perovskite Materials and Applications
- Radioactive contamination and transfer
- Topological Materials and Phenomena
- Fusion materials and technologies
National Agency for New Technologies, Energy and Sustainable Economic Development
2019-2025
ENEA Bologna Research Centre
2022
University of Geneva
2009-2019
Superconducting and other Innovative Materials and Devices Institute
2018-2019
University of Salerno
2016
National Institute for Materials Science
2006-2008
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2006-2008
University of Genoa
2000-2006
Centre National de la Recherche Scientifique
2002
We study the evolution of band gap structure in few-layer MoTe2 crystals, by means low-temperature microreflectance (MR) and temperature-dependent photoluminescence (PL) measurements. The analysis measurements indicate that complete analogy with other semiconducting transition metal dichalchogenides (TMDs) dominant PL emission peaks originate from direct transitions associated recombination excitons trions. When we follow intensity as a function layer thickness, however, observe behaves...
Semiconducting transition metal dichalcogenides (TMDs) have emerged as materials that can be used to realize two-dimensional (2D) crystals possessing rather unique transport and optical properties. Most research has so far focused on sulfur selenium compounds, while tellurium-based attracted little attention far. As a first step in the investigation of Te-based semiconducting TMDs this context, we studied MoTe2 with thicknesses above 4 nm, focusing surface quantitative determination gap...
Hydrogels represent a versatile class of materials with remarkable potential as three-dimensional matrices for nanoparticle integration. This study explores the mechanism silver formation within polyacrylamide–alginate hybrid hydrogel, employing controlled reduction–oxidation reaction between nitrate (AgNO3) and sodium borohydride (NaBH4) across temperature gradient (5–70 °C). Characterization techniques, including Raman, infrared, UV-Vis spectroscopies, X-ray diffraction, scanning electron...
The transition-metal dichalcogenide 1T-TiSe2 is a quasi-two-dimensional layered material with charge density wave (CDW) transition temperature of T(CDW) ≈ 200 K. Self-doping effects for crystals grown at different temperatures introduce structural defects, modify the temperature-dependent resistivity, and strongly perturbate CDW phase. Here, we study doping nature such native defects combining scanning tunneling microscopy or spectroscopy ab initio calculations. dominant single atom dopants...
Single crystals of Mo and Ta dichalcogenides, MX2 (M = Mo, X S, Se, Te), have been grown by the vapor transport method in closed atmosphere, using a novel reaction that involves mixture M, MCl5 as source. The most important parameters must be kept under control for succeeding crystal growth are temperature, which depends mainly on X, initial M:MCl5 ratio. best temperature is found to highest case tellurides, lowest sulfides intermediate selenides. optimal molar ratio decreases with atomic...
BiTeI is a giant Rashba spin splitting system, in which non-centro symmetric topological phase has recently been suggested to appear under high pressure. We investigated the optical properties of this compound, reflectivity and transmission, pressures up $15$ GPa. The gap feature conductivity vanishes above $p \sim 9$ GPa does not reappear at least plasma edge, associated with intrinsically doped charge carriers, smeared out through transition $9$ Using pressure Raman spectroscopy, we follow...
The impact of variable Ti self-doping on the 1T-TiSe2 charge density wave (CDW) is studied by scanning tunneling microscopy. Supported functional theory we show that agglomeration intercalated-Ti atoms acts as preferential nucleation centers for CDW breaks up in phaseshifted domains whose size directly depends concentration and which are separated atomically-sharp phase boundaries. close relationship between diminution domain disappearance anomalous peak temperature dependent resistivity...
We present a detailed low temperature scanning tunneling microscopy study of the commensurate charge density wave (CDW) in 1$T$-TiSe$_2$ presence single atom defects. find no significant modification CDW lattice crystals with native defects concentrations where some bulk probes already measure substantial reductions phase transition signature. Systematic analysis STM micrographs combined functional theory modelling atomic defect patterns indicate that observed modulation lies Se surface...
The formation of BaZrO 3 from very fine (70–90 nm) ZrO 2 powders and coarser (∼1 μm) BaCO has been studied in dry humid air up to 1300°C using TGA/DTA, XRD, SEM, TEM, EDS microanalysis. In the temperature range 900°–1100°C, barium is rapidly transported at surface particles reacts, forming . compound grows as a concentric layer with gradual consumption central particle. overall kinetics well described by diminishing core model, most likely rate‐determining step phase‐boundary process –BaZrO...
Ag2MoO4 crystals were prepared by a precipitation method mixing parent solutions of silver nitrate and sodium molybdate. The effects experimental parameters such as temperature, concentration, pH studied. samples found to be crystalline, pure, monophasic in all cases, except the case very low pH. leads formation cubic phase β no secondary is present within limits detection XRD Raman spectroscopy. However, some at high temperature pH, oxide nanoparticles form on surfaces crystals, which...
The corrosion behavior of certain steels under extremely oxidative conditions, simulating the impact water radiolysis on stainless steels, has been investigated. Radiolysis generates aggressive species, including radicals, solvated electrons, and hydrogen peroxide, potentially leading to over time in materials typically considered resistant. To expedite kinetics this phenomenon, drastic conditions were employed, involving high concentrations peroxide a strongly acidic environment. Under...
The use of a doped Ceria buffer layer and Physical Vapour Deposition (PVD) techniques for Solid Oxide Fuel Cells (SOFC) fabrication can limit the former, formation electrical insulating lanthanum, strontium zirconates at cathode/electrolyte interface, whereas latter allows better control materials interfaces. These effects allow operation intermediate temperature ranges. In this work, we study structural properties Gadolinium Doped (GDC) barrier deposited via room RF Sputtering technique on...
99mTc-based radiopharmaceuticals are the most commonly used medical radioactive tracers in nuclear medicine for diagnostic imaging. Due to expected global shortage of 99Mo, parent radionuclide from which 99mTc is produced, new production methods should be developed. The SORGENTINA-RF (SRF) project aims at developing a prototypical medium-intensity D-T 14-MeV fusion neutron source specifically designed radioisotopes with focus on 99Mo. scope this work was develop an efficient, cost-effective...
In Ti-intercalated self-doped $1T\text{\ensuremath{-}}{\mathrm{TiSe}}_{2}$ crystals, the charge density wave (CDW) superstructure induces two nonequivalent sites for Ti dopants. Recently, it has been shown that increasing doping dramatically influences CDW by breaking into phase-shifted domains. Here, we report scanning tunneling microscopy and spectroscopy experiments reveal a dopant-site dependence of gap. Supported functional theory, demonstrate loss long-range phase coherence introduces...
Spatially inhomogeneous electronic states are expected to be key ingredients for the emergence of superconducting phases in quantum materials hosting charge-density-waves (CDWs). Prototypical transition-metal dichalcogenides (TMDCs) and among them, 1$T$-TiSe$_2$ exhibiting intertwined CDW under Cu intercalation, pressure or electrical gating. Although it has been recently proposed that superconductivity relates fluctuations development spatial inhomogeneities order, fundamental mechanism...
Na2MoO4 and Na2WO4 are isostructural semiconductors, belonging to the spinel class. They have interesting properties find applications in numerous sectors. These can be tuned by controlling composition of their solid solutions. Here, different methods obtain these compounds presented, both wet solid-state synthesis. The obtained results show a possible dependence material on chosen synthesis method. pure mixtures were characterized Raman spectroscopy, scanning electron microscopy, X-ray diffraction.