A5038292580- High-pressure geophysics and materials
- 2D Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Perovskite Materials and Applications
- MXene and MAX Phase Materials
- Boron and Carbon Nanomaterials Research
- Ionic liquids properties and applications
- Solid-state spectroscopy and crystallography
- Crystallography and molecular interactions
- Geological and Geochemical Analysis
- Iron-based superconductors research
- Crystal Structures and Properties
- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Chemical Thermodynamics and Molecular Structure
- Planetary Science and Exploration
- Spectroscopy and Laser Applications
- Synthesis and Properties of Aromatic Compounds
- Advanced Chemical Physics Studies
- Electronic and Structural Properties of Oxides
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Quantum, superfluid, helium dynamics
- Advanced Semiconductor Detectors and Materials
- Metal-Organic Frameworks: Synthesis and Applications
Synchrotron soleil
2016-2025
Sapienza University of Rome
2012-2019
University of Pavia
2015
Silicon, arguably the most important technological semiconductor, is predicted to exhibit a range of new and interesting properties when grown in hexagonal crystal structure. To obtain pure silicon great challenge because it naturally crystallizes cubic Here, we demonstrate fabrication stable evidenced by structural characterization. In our approach, transfer structure from template gallium phosphide nanowire an epitaxially shell, such that formed. The typical ABABAB... stacking shown...
In this paper we provide an accurate high-pressure structural and optical study of MAPbI3 hybrid perovskite. Structural data show the presence a phase transition towards orthorhombic structure around 0.3 GPa followed by full amorphization system above 3 GPa. After releasing pressure systems keeps phase. The occurrence these transitions is further confirmed induced variations photoluminescence signal at high pressure. These clearly indicate that bandgap value electronic MAPI change across transition.
Ensuring hydrostatic conditions in high pressure experiments is of utmost importance for obtaining reproducible and comparable dataset. Here, we investigate the degree hydrostaticity four pressure-transmitting media (PTM), three alkali halides polyethylene, commonly used infrared (IR) spectroscopy using multiple rubies as sensors within a diamond anvil cell (DAC) cavity. We demonstrate that standard deviation always below 0.3 GPa at pressures 10 sodium chloride (NaCl) provides best...
The chromium terephthalate MIL-101 is a mesoporous metal-organic framework (MOF) with unprecedented adsorption capacities due to the presence of giant pores. application an external pressure can effectively modify open structure MOFs and its interaction guest molecules. In this work, we study under by synchrotron X-ray diffraction infrared (IR) spectroscopy several transmitting media (PTM). Our experimental results clearly show that when solid medium as NaCl employed, irreversible...
The key parameters governing the mechanical stability of highly porous materials such as metal–organic frameworks (MOFs) are yet to be clearly understood. This study focuses on role linker connectivity by investigating MIL-100(Cr), a mesoporous MOF with hierarchical structure and tritopic linker, comparing it MIL-101(Cr) having instead ditopic linker. Using synchrotron X-ray diffraction infrared spectroscopy, we investigate high-pressure behavior MIL-100(Cr) both solid fluid pressure...
A detailed Raman study has been carried out on the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14-TFSI) over a wide pressure (0-8 GPa) and temperature (100-300 K) range. The explored thermodynamic region allowed us to evolution of system across different solid phases. Calculated spectra remarkably helped in spectral data analysis. In particular, behavior most intense peak shape analysis ruby fluorescence (used as local gauge) identify liquid-solid...
Organo-lead halide perovskites are nowadays considered to be an emerging photovoltaic material.It is clear that the peculiar hybrid nature of this class materials central for their outstanding optical and transport properties.However, role organic cation its interplay with inorganic framework remains elusive.To get insight into interactions at play, highpressure Raman, infrared, X-ray absorption spectroscopy measurements were performed on MAPbBr 3 (MA = CH NH + ).Since lattice compression...
The confinement in colloidal HgTe nanocrystals enables this material to be promising for optoelectronics over a wide range of energies, from the THz spectral up visible region. Herein, using combination high-energy-absorption nanoplatelets and low-energy-absorption nanocrystals, we probe optical transmission nanoparticles 0.26–1.8 eV range, 0 300 K temperatures under simultaneous pressure, 4 GPa. While pressure dependence follows one observed bulk temperature dramatically differs...
Abstract The soft nature of organic–inorganic halide perovskites renders their lattice particularly tunable to external stimuli such as pressure, undoubtedly offering an effective way modify structure for extraordinary optoelectronic properties. Here, using the methylammonium lead iodide a representative exploratory platform, it is observed that pressure‐driven disorder can be significantly suppressed via hydrogen isotope effect, which crucial better optical and mechanical properties...
A combined experimental/theoretical approach has been used to investigate the role of water in modifying microscopic interactions characterizing optical response 1-butyl-ammonium nitrate (BAN) solutions. Raman spectra, dominated by signal from protic ionic liquid, were collected as a function content, and corresponding spatial organization couples, well their local arrangement with molecules, was studied exploiting classical molecular dynamics calculations. High quality spectroscopic data,...
Absorbance spectra of two ionic liquids, the short alkyl chain N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl)imide (TMPA-TFSI) and longer N-trimethyl-N-hexylammonium (TMHA-TFSI) are reported as a function pressure temperature. The occurrence various phase transitions is evidenced by changes in relative concentration cisoid transoid conformers their common TFSI anion. infrared spectrum TMPA-TFSI was measured at 300 K with an applied varying over 0-5 GPa range. Above 0.2 only trans...
Bacterial spores are extremely resistant life-forms that play an important role in food spoilage and foodborne disease. The return of to a vegetative cell state is three-step process, these being activation, germination, emergence. High-pressure (HP) processing known induce germination part the spore population even inactivate high number Bacillus when combined with other mild treatments such as addition nisin. aim present work was investigate mechanisms involved sensitization nisin...
Hybrid organic–inorganic perovskites (HOIPs) have emerged as outstanding candidates for high-performance photovoltaic devices, and a large variety of HOIPs has been synthesized with different compositions structural motifs. However, issues remain about their stability optimization applications, motivating studies to provide better insight into understanding the structure-property relationship. The application pressure proven be valuable tool reach this goal without altering chemical...
The morphological changes of Si nanowires (Si NWs) cycled in 1:1 ethylene–carbonate (EC)/diethyl–carbonate (DEC) with or without different additives, fluoroethylene carbonate (FEC) vinylene (VC), as well the composition deposited solid–electrolyte interphase layer, are investigated by a combination experimental microscopic and spectroscopic techniques. Scanning electron microscopy optical spectroscopy highlight that NW morphology is better preserved samples presence FEC VC additives compared...
The interplay between electronic correlations, density wave orders, and magnetism gives rise to several fascinating phenomena. In recent years, kagome metals have emerged as an excellent platform for investigating these unique properties, which stem from their itinerant carriers arranged in a lattice. Here, we show that structure of the prototypical metal, Fe$_3$Sn$_2$, can be tailored by manipulating breathing distortion its lattice with external pressure. is suppressed around 15 GPa...
Magnetic frustration is a key ingredient to prevent conventional ordering and, in combination with enhanced fluctuations low dimensional quantum magnets, stabilize the long sought spin liquid ground states. Most experimental candidates inevitably deviate from perfectly frustrated models due chemical and structural disorder, blurring nature origin of their Y-Kapellasite Y$_3$Cu$_9$(OH)$_{19}$Cl$_{8}$ realizes chemically clean system an underlying kagome sub-lattice. The crystals undergo...
We present high-quality optical data and density functional perturbation theory calculations for the vibrational spectrum of solid picene (C${}_{22}$H${}_{14}$) under pressure up to 8 GPa. First-principles reproduce with a remarkable accuracy effects on both frequency intensities observed phonon peaks. use projection molecular eigenmodes unambiguously fit experimental spectra, resolving complicated spectral structures, in system hundreds modes. With these projections, we can also quantify...
Applying elastic deformation can tune a material's physical properties locally and reversibly. Spatially modulated lattice create bandgap gradient, favoring photogenerated charge separation collection in optoelectronic devices. These advantages are hindered by the maximum strain that material withstand before breaking. Nanomaterials derived exfoliating transition metal dichalcogenides (TMDs) an ideal playground for deformation, as they sustain large strains, up to few percent. However,...
Mercury chalcogenide nanocrystals generate a lot of interest as active materials for low-cost infrared sensing. Device improvement requires building deeper understanding their electronic structure, which combines inverted band ordering, quantum confinement, and dependence on surface chemistry. This is particularly true with the development mercury colloidal heterostructures (HgSe/HgTe, HgTe/CdS...). In this case, lattice mismatch induces strain, affects significantly gap, given narrow gap...