A5070771798- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Superconductivity in MgB2 and Alloys
- Iron-based superconductors research
- Magnetic properties of thin films
- 2D Materials and Applications
- Quantum and electron transport phenomena
- Force Microscopy Techniques and Applications
- Carbon Nanotubes in Composites
- Adaptive optics and wavefront sensing
- Graphene research and applications
- Geophysics and Sensor Technology
- MXene and MAX Phase Materials
- Advanced Fiber Optic Sensors
- Electronic and Structural Properties of Oxides
- Copper-based nanomaterials and applications
- Pulsars and Gravitational Waves Research
- ZnO doping and properties
- Advanced Sensor and Energy Harvesting Materials
- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Surface and Thin Film Phenomena
- Acoustic Wave Resonator Technologies
University of Salerno
2014-2024
Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Salerno
2019-2024
Superconducting and other Innovative Materials and Devices Institute
2011-2024
National Research Council
2014-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2009-2024
Temple University
2019-2022
MBN Nanomaterialia (Italy)
2014
University of Naples Federico II
2009
Istituto Nazionale per la Fisica della Materia
1996-2005
Centre National de la Recherche Scientifique
2002-2003
Abstract 2D materials, such as graphene, hexagonal boron nitride (hBN), and transition‐metal dichalcogenides (TMDs), are intrinsically flexible, can withstand very large strains (>10% lattice deformations), their optoelectronic properties display a clear distinctive response to an applied stress. As such, they uniquely positioned both for the investigation of effects mechanical deformations on solid‐state systems exploitation these in innovative devices. For example, materials be easily...
We present the fabrication of thick and dense carbon nanotube networks in form freestanding films (CNTFs) study their electric resistance as a function temperature, from 4 to 420 K. A nonmetallic behavior with monotonic R(T) temperature coefficient around −7×10−4 K−1 is generally observed. behavioral accordance CNTF conductance measured by solid-state thermistor (ZnNO, Si, or Pt) demonstrated, suggesting possibility using CNTFs small-sized (freely scalable) sensors, besides being confirmed...
Abstract The realization of ordered strain fields in 2D crystals is an intriguing perspective many respects, including the instauration novel transport regimes and enhanced device performances. However, current straining techniques hardly allow to reach strains higher than ≈3% most cases there no control over distribution. In this work, a method demonstrated subject micrometric regions atomically thin molybdenum disulfide (MoS 2 ) giant with desired ordering. Selective hydrogen‐irradiation...
Abstract Atomic-scale intrinsic defects play a key role in controlling functional electronic properties of two-dimensional (2D) materials. Here, we present low-temperature scanning–tunneling microscopy and spectroscopy investigation common point-defect monolayer molybdenum disulfide (MoS 2 ). We employ sample preparation method which the film surface is never exposed to air so that native dangling bonds surrounding are preserved. Molybdenum vacancies identified by their three characteristic...
Proximity effects in superconducting normal (SN) material heterostructures with metals and semiconductors have long been observed theoretically described terms of Cooper pair wave functions Andreev reflections. Whereas the semiconducting N-layer materials proximity experiments to date doped tens nanometers thick, we present here a tunneling study involving pristine single-layer transition-metal dichalcogenide film MoS2 placed on top Pb thin film. Scanning microscopy spectroscopy together...
Among all transition metal oxides, titanium dioxide (TiO
Low-temperature magnetic force microscopy has been used to visualize spontaneous formation of vortex-antivortex pairs in hybrid ferromagnet/superconductor systems. Vortex-antivortex are induced by the periodic stray field ferromagnet. We find general equilibrium conditions for which formed during zero-field cooling bilayers. Vortices can be generated ferromagnet domains absence an external and they thermodynamically stable values period stripe that exceed a certain threshold.
The ability to control nanoscale electronic properties by introducing macroscopic strain is of critical importance for the implementation two-dimensional (2D) materials into flexible electronics and next-generation engineering devices. In this work, we correlate atomic-scale lattice deformation with a systematic bending monolayer molybdenum disulfide films using scanning tunneling microscopy spectroscopy implemented custom-built sample holder strain. Using technique, are able induce strains...
Abstract The combination of extremely high stiffness and bending flexibility with tunable electrical optical properties makes van der Waals transition metal dichalcogenides appealing both for fundamental science applied research. By taking advantage localized H 2 ‐bulged MoS membranes, an innovative approach, based on atomic force microscopy nanoindentation, is demostrated discussed here, aiming at measuring elastic thermodynamic nanoblisters made 2D materials. results, interpreted in the...
Apolar syndiotactic polystyrene (s-PS) can easily form a stable clathrate co-crystalline phase with highly polar 4-nitroaniline molecules. The ferroelectric response of thin films containing the s-PS/4-nitroaniline has been investigated by scanning piezoresponse force microscopy (SPFM) and compared poly(vinylidene-fluoride-trifluoroethylene) P(VDF-TrFE) copolymer film. Measurements show that polymer materials be obtained crystalline phases whose polarity is given low-molecular-mass guest...
β amyloid peptide plays an important role in both the manifestation and progression of Alzheimer disease. It has a tendency to aggregate, forming low-molecular weight soluble oligomers, higher-molecular protofibrillar oligomers insoluble fibrils. The relative importance these single oligomeric-polymeric species, relation morbidity disease, is currently being debated. Here we present Atomic Force Microscopy (AFM) study Aβ(25-35) aggregation on hydrophobic dioleoylphosphatidylcholine (DOPC)...
Low-temperature magnetic force microscopy was used to study the threshold of nucleation spontaneous vortex-antivortex structures in superconductor/ferromagnet (S/F) hybrid systems. We investigated S/F heterostructures composed Py as material and Nb superconductor, with different thicknesses Nb. The condition for depends on fundamental parameters such superconducting penetration depth coherence length, well thickness film domain width. compare our experimental results those existing...
Impressive changes in the transport and ferromagnetic properties of Co-doped ZnO thin films have been obtained by postgrowth hydrogen irradiation at temperatures 400 °C. Hydrogen incorporation increases saturation magnetization one order magnitude (up to ∼1.50 μB/Co) carrier density mobility about a factor two. In addition magnetic characterization, structural hydrogenated ZnO:Co investigated Hall effect, local probe conductivity measurements, micro-Raman, X-ray absorption spectroscopy....
The outstanding mechanical performances of two-dimensional (2D) materials make them appealing for the emerging fields flextronics and straintronics. However, their manufacturing integration in 2D crystal-based devices rely on a thorough knowledge hardness, elasticity, interface mechanics. Here, we investigate elasticity highly strained monolayer-thick MoS2 membranes, shape micrometer-sized domes, by atomic force microscopy (AFM)-based nanoindentation experiments. A dome's crushing procedure...
While Abrikosov vortices repel each other and form a uniform vortex lattice in bulk type-II superconductors, strong confinement potential profoundly affects their spatial distribution eventually leading to cluster formation. The could be induced by the geometric boundaries mesoscopic-size superconductors or modulation of magnetic field superconductor/ferromagnet (S/F) hybrids. Here we study S/F thin film heterostructures observe that clusters appear near magnetization inhomogeneities...
Piezoelectricity and charge storage of undoped Co-doped ZnO thin films were investigated by means PiezoResponse Force Microscopy Kelvin Probe Microscopy. We found that exhibits a large piezoelectric response, with the mean value matrix element d33 slightly lower than in sample. Moreover, we demonstrate Co-doping affects homogeneity probably as consequence crystalline degree exhibited doped samples. also investigate nature interface between metal electrode, made up PtIr AFM tip, well...
Star copolymer films were produced by using spin-coating, drop-casting, and casting deposition techniques, thus obtaining ultrathin thick films, respectively. The morphology is generally flat, but it becomes substrate-dependent for where the planarization effect of not efficient. indentation hardness was investigated Force Volume Maps in both air liquid. In air, are substrate-dominated zone and, thus, elastic modulus E overestimated, while reaches its bulk value drop-casted films. liquid...
In recent years, metamaterials have emerged as a crucial technology for designing sub-wavelength thick optical components capable of performing various functions. Among the others, these nanostructures could be employed to tune refractive index, making them useful in fields (from optoelectronic applications gravitational wave detectors). this work, nanostratified structures composed alternating layers silica (SiO2) and titania (TiO2) were proposed fabricated using plasma-assisted electron...
We report a demonstration of $S\ensuremath{-}I\ensuremath{-}S$ quasiparticle tunneling in c-axis oriented planar junctions consisting YBaCuO/PrBaCuO/HoBaCuO thin film heterostructures. In the conductance curves at low temperatures well developed peaks indicative gap structures are found $\ifmmode\pm\else\textpm\fi{}45$ mV. The high bias shows flat dependence on energy and best quality junction has zero-bias less than 0.05 normal state value. discuss our spectra framework BCS-like density...