A5060722684- Glass properties and applications
- Luminescence Properties of Advanced Materials
- Silicon Nanostructures and Photoluminescence
- Ga2O3 and related materials
- Photonic Crystals and Applications
- Nuclear materials and radiation effects
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and devices
- ZnO doping and properties
- Mineralogy and Gemology Studies
- Advancements in Battery Materials
- Laser Material Processing Techniques
- Photorefractive and Nonlinear Optics
- Advanced Condensed Matter Physics
- Ferroelectric and Piezoelectric Materials
- Magnetic and transport properties of perovskites and related materials
- Quantum Dots Synthesis And Properties
- Nonlinear Optical Materials Studies
- Phase-change materials and chalcogenides
- Crystal Structures and Properties
- Material Science and Thermodynamics
- Photonic and Optical Devices
- Microwave Dielectric Ceramics Synthesis
- Solid-state spectroscopy and crystallography
- Solid State Laser Technologies
University of Milano-Bicocca
2014-2024
D. Mendeleyev University of Chemical Technology of Russia
2011-2022
Mylan (Switzerland)
2014-2019
Milano University Press
2019
University of Milan
1997-2013
STMicroelectronics (Italy)
2013
National Interuniversity Consortium for the Physical Sciences of Matter
2006-2011
Los Alamos National Laboratory
2010
STMicroelectronics (Czechia)
2007
National Academy of Sciences of Belarus
2006
The understanding of phenomena involved in the self-assembling bio-inspired biomaterials acting as three-dimensional scaffolds for regenerative medicine applications is a necessary step to develop effective therapies neural tissue engineering. We investigated self-assembled nanostructures functionalized peptides featuring four, two or no glycine-spacers between self-assembly sequence RADA16-I and functional biological motif PFSSTKT. effectiveness their functionalization was assessed via...
Nanoclusters of crystalline SnO2 have been grown in glass, starting from tin-doped silica prepared by a sol–gel method. Based upon particular choice molecular precursors, nanocrystallites with mean radius about 1 nm and quite narrow size dispersion were obtained, resulting wide-band-gap (>4 eV) quantum dots (QDs). In this system, differently other semiconductor-doped glasses, both the glassy host nanophase are oxides IV-group elements. Owing to their thermochemical compatibility, two...
Spectrally resolved thermostimulated-luminescence (TSL) measurements have been carried out on samples of synthetic quartz, submitted to different treatments in order change the type charge compensation at substitutional aluminum sites. Near-infrared (NIR) optical absorption, electron paramagnetic resonance (EPR), and ac ionic conductivity performed monitor kinetics defects involved treatments. A specific treatment, consisting a prolonged high-temperature annealing vacuum (10 h 1400...
Hospitals and other healthcare facilities harbor a complex interplay of microbial pathogens. The correct understanding pathogens distribution evolution is therefore crucial for infections control the design effective prevention strategies. In parallel, integration cutting-edge nanotechnologies early detection monitoring these specific target considered most approach to face nosocomial infections. this context, point-of-care (POC) testing, also known as near-patient becoming increasingly...
This paper presents the 8 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> BCD generation integrating power and high voltage devices in a 0.18 μm technology node platform. Both dense 1.8 V 3.3 logic CMOS are available to realize complex monolithic solutions field of smart applications.
Nanoparticles in amorphous oxides are a powerful tool for embedding wide range of functions optical glasses, which still the best solutions several applications ever growing field photonics. However, control nanoparticle size inside host material is often challenging task, even more when detrimental effects on light transmittance have to be avoided. Here we show how process phase separation and subsequent nanocrystallization Ga-oxide can controlled germanosilicates – prototypal systems...
The target of taking advantage the near-infrared light-emission properties nickel ions in crystals for design novel broadband optical amplifiers requires identification suitable nanostructured glasses able to embed Ni-doped nanocrystals and preserve workability a glass. Here we show that Ni doping Li2O–Na2O–Ga2O3–GeO2–SiO2 glass (with composition 7.5:2.5:20:35:35 melting temperature 1480 °C, sensibly lower than Ge-free silicates) enables selective embedding thermally grown spinel-like...
Er-doped tin–silicate glass–ceramic composites were synthesized from Si, Er and Sn molecular precursors by following a sol–gel method. Optical spectroscopy electron microscopy showed that the resulting material is composed of an amorphous silica network encloses submicrometric SnO2 crystalline clusters. Analysis luminescence properties shows ions are, at least partially, trapped in phase. Raman spectra show nanostructured act as low phonon energy hosts for rare earth are thus suitable...
Excitation pattern and decay kinetics of ultraviolet photoluminescence porous silica are investigated between 4.5 10 eV by means synchrotron radiation. Spectra dominated a 3.7 emission similar to the recently observed oxidized Si nanostructures. Emission intensity is found be controlled material specific surface. Other emissions at 2.9, 3.8, 4.2 eV. All show lifetimes few nanoseconds. Spectral kinetic features sensibly different than in glassy SiO2, suggesting revision previous assignments
The mechanism underlying self-assembly of short peptides has not been fully understood despite the fact that a few decades have passed since their serendipitous discovery. RADA16-I (AcN-RADARADARADARADA-CONH2), representative class self-assembling with alternate hydrophobic and hydrophilic residues, self-assembles into β-sheet bilayer filaments. Though sliding diffusion model for this developed in previous works, theory need further improvements, supported by experimental investigations, to...
Wide-bandgap nanocrystals are an inexhaustible source of tuneable functions potentially addressing most the demand for new light emitting systems. However, implementation nanocrystal properties in real devices is not straightforward if a robust and stable optical component required as final result. The achievement efficient emission from dense dispersions Ga-oxide UV-grade glass can be breakthrough this regard. Such result would permit fabrication low cost UV-to-visible converters monitoring...
We give the spectroscopic evidence of energy transfer to erbium ions provided by ${\mathrm{SnO}}_{2}$ nanocrystals in silica. The spectral and time resolved analysis nanocluster luminescence resonant with ${\mathrm{Er}}^{3+}$ transitions demonstrates that take part energy-transfer mechanisms an efficiency about $20%$. features emission excited allow ascribe it sites ordered environments, nearby crystalline tin-dioxide nanoclusters.
Crystal-field calculations of the energy structure 4d multiplet ${\mathrm{Zr}}^{3+}$ ion were carried out for a large number configurations environment in crystal lattice cubic stabilized zirconia, starting from neutron-diffraction data. The presence oxygen vacancies gives rise to sixfold- and sevenfold-coordinated sites where field is strongly distorted with respect regular cannot be treated perturbative approximation weak distortions. problem assignment axial EPR signal optical-absorption...
Single crystals of yttria-stabilized zirconia (12 mol % ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$) have been x-ray irradiated at room temperature. The electron paramagnetic resonance spectrum the filled traps is analyzed in terms a single oxygen vacancy type defect with its symmetry axis along 〈111〉 direction. angular dependence linewidth and asymmetry line shape are attributed to disordered rearrangements anion sublattice surrounding vacancy. This affects local crystal fields directions defects.
We demonstrate optical amplification over a band >850 meV, via simultaneous exploitation of stimulated emission from mixed polymer systems in which energy transfer the higher to lower-gap material is inhibited thanks complex interplay between morphology and interchain decoupling, driven by chain encapsulation. Amplified spontaneous (ASE) obtained both with ad-hoc pumping into relevant bands or single excitation (400nm) able sustain ASE at wavelengths simultaneously (two-colour ASE). Detailed...
Pure and Eu-doped γ-Ga<sub>2</sub>O<sub>3</sub>nanopowders with an organic capping layer were obtained by a benzyl alcohol route. Photoluminescence experiments allowed assigning the strong blue light emission to aromatic ketone derivative.
Optical transitions of radiation-induced paramagnetic Ge centers have been investigated in Ge-doped ${\mathrm{SiO}}_{2}$ samples containing a negligible amount native oxygen coordination defects, whose optical absorption usually dominates the UV spectral range. The analysis and electron resonance (EPR) spectra following different irradiation thermal annealing treatments shows that two absorptions (at 4.4 5.7 eV) are related to an orthorhombic EPR signal [Ge(1) literature], while band at...
Silica glasses with substitutional Sn-doping or dispersion of SnO2 nanoclusters were prepared by the sol–gel method. The occurrence clustering was investigated optical absorption, Raman scattering and electron paramagnetic resonance spectroscopies, varying both tin concentration densification temperature Sn-doped silica xerogels. 3.7 eV absorption edge A1g mode at 630 cm−1 phonon spectrum used to assess presence nanoclusters; yield X-ray induced E′ Sn centres monitored probe variation in...
Sn O 2 nanocrystals are grown in silica starting from a sol-gel method and using Er doping to passivate the cluster boundaries. As result, emission at 3.8eV decay of SnO2 free excitons is observed nanostructured SnO2:SiO2, besides extrinsic 2eV luminescence defects ascribable substoichiometric nanocluster The analysis competitive with ultraviolet (UV) evidences involvement phonon mode 210cm−1 SnO-like phase. feasibility passivated wide-band-gap gives interesting perspectives for UV-emitting...