B migration in Si and Ge matrices raised a vast attention because of its influence on the production confined, highly p-doped regions, as required by miniaturization trend. In this scenario, diffusion atoms can take place under severe conditions, often concomitant, such very large concentration gradients, non-equilibrium point defect density, amorphous-crystalline transition, extrinsic doping level, co-doping, clusters formation dissolution, ultra-short high-temperature annealing. paper, we...

Analytical methods for the early detection of neurodegenerative biomarker Parkinson’s disease (PD), α-synuclein, are time-consuming and invasive, require skilled personnel sophisticated expensive equipment. Thus, a pain-free, prompt simple α-synuclein biosensor in plasma is highly demanded. In this paper, an electrochemical based on hierarchical polyglutamic acid/ZnO nanowires decorated by gold nanoparticles, assembled as nanostars (NSs), determination human proposed. ZnO NSs were prepared...

Electrochemical hydrogen evolution reaction (HER) is one of the most promising green methods used to produce renewable and sustainable energy. The development a highly efficient Pt-free electrocatalyst for HER crucial point ecosustainability cost reduction this method. Herein, WO3 nanorods were synthesized by hydrothermal method calcinated in air at 400 °C different times (30, 60, 90 min). Experimental investigation involved SEM, TEM, XRD, electrochemical analyses such as linear sweep...

Nanostructured WO3 represents a promising material for fast and reliable molecular hydrogen detection through chemo-resistive effect. Here, an extended experimental investigation of WO3-H2 interaction is presented modeled. A powder nanorods (400 nm long, 50 large) produced by hydrothermal technique drop casted on Pt interdigitated electrode. H2 sensing tests at different concentrations (2000–50,000 ppm) temperatures (250–400 °C) are reported. Scanning Electron Microscopy (SEM), X-ray...

Energy storage devices based on earth-abundant materials are key steps towards portable and sustainable technologies used in daily life. Pseudocapacitive devices, combining high power energy density features, widely required, transition metal oxides represent promising building owing to their excellent stability, abundance, ease of synthesis. Here, we report an original ZnO-based nanostructure, named nanostars (NSs), obtained at yields by chemical bath deposition (CBD) applied as...

High doping regimes of B implanted Ge have been accurately characterized combining Hall effect technique and nuclear reaction analysis. Preamorphized was with at 35keV (spanning the 0.25–25×1020B∕cm3 concentration range) recrystallized by solid phase epitaxy 360°C. The scattering factor maximum active resulted rH=1.21 ∼5.7×1020B∕cm3, respectively. room-temperature carrier mobility measured, decreasing from ∼300to50cm2∕Vs in investigated dopant density, a fitting empirical law is given. These...

A new concept in the formulation of hybrid nanostructured materials combining high quality graphene 3D supported by Nickel foam and polyporphyrins for visible light photocatalytic application is here reported. Our innovative approach involves development a freestanding device able to: i) offer surface area to bind photosensitizers π-π interactions, ii) enhance stability efficiency using cyclic porphyrin polymers. For these purposes, homo- co-polymerization reactions different (free or zinc...

Nanostructured WO3 represents a promising material for electrochromic and sensing devices. In this scenario, electrodeposition is low-cost approach careful production. The of tungsten oxide film from peroxo-tungstic-acid (PTA) solution investigated. synthetized onto Indium doped Tin Oxide (ITO) substrates, in variety shapes, fragmentary, thin layer up to thick continuous film. Samples were investigated by scanning electron (SEM) atomic force microscopy (AFM), Rutherford backscattering...

The goal of this work was to investigate the morphological and chemical-physical changes induced by adding ZnO nanoparticles bio-based polymeric materials based on polylactic acid (PLA) polyamide 11 (PA11). Precisely, photo- water-degradation phenomena nanocomposite were monitored. For purpose, formulation characterization novel bio-nanocomposite blends PLA PA11 at a ratio 70/30 wt.% filled with zinc oxide (ZnO) nanostructures different percentages performed. effect (≤2 wt.%) within...

Biopolymers are of growing interest, but to improve some their poor properties and performance, the formulation bio-based blends and/or adding nanoparticles is required. For this purpose, in work, two different metal oxides, namely zinc oxide (ZnO) titanium dioxide (TiO

Hydrogen (HER) and Oxygen (OER) evolution reactions play a fundamental role in the field of green environmental sustainability, because they are key for water electrolysis. In this work copper (Cu) nanoparticles (NPs) produced by pulsed laser ablation liquid from target framework developing low-cost, earth abundant non-pollutant electrocatalyst. Various solvent energy fluence explored. Electrodes have been realized drop-casting Cu NPs onto Nickel foam (NF) substrate, with catalyst loading...

In this work, we have investigated the stoichiometry of boron-interstitial clusters (BICs) produced in a molecular-beam-epitaxy-grown B box by Si implantation and annealing, their dissolution during further prolonged annealing cycles. Low-concentration delta doping was used to quantitatively monitor interstitial (I) flux. A stoichiometric ratio about 1.2 between I found for BICs formed at 815 °C. The BIC kinetics analyzing concentration profiles different times temperatures (in range 815–950...

We have elucidated the mechanism for B migration in amorphous (a-) Si network. diffusivity a-Si is much higher than crystalline Si; it transient and increases with concentration up to 2 x 10(20) B/cm(3). At density, atoms quickly precipitate. diffusion indirect, mediated by dangling bonds (DB) present a-Si. The density of DB enhanced accommodation network decreases because relaxation. Accurate data simulations allow one extract diffusivity, whose activation energy 2.6 eV. Implications these...

In this work we investigate pulse laser annealing as an alternative approach to reach high-level incorporation of Sb in substitutional location crystalline germanium. Laser irradiation is demonstrated recover also those structural defects, like honeycomb structures, that form during high-fluence heavy-ion implantations Ge and cannot be eliminated by conventional thermal treatments. Indeed, concentrations higher than 1×1021 at./cm3 have been obtained, well above the solid solubility Ge. The...

B diffusion in crystalline Ge is investigated by proton irradiation thin layers with delta doping under different fluences $(1\ifmmode\times\else\texttimes\fi{}{10}^{15}--10\ifmmode\times\else\texttimes\fi{}{10}^{15}\text{ }{\text{H}}^{+}/{\text{cm}}^{2})$, fluxes $(6\ifmmode\times\else\texttimes\fi{}{10}^{11}--35\ifmmode\times\else\texttimes\fi{}{10}^{11}\text{ }{\text{H}}^{+}/{\text{cm}}^{2}\text{ }\text{s})$, and temperatures of the implanted target (from $\ensuremath{-}196$ to $550\text{...

Experimental studies about electrical activation and clustering of B implanted in crystalline Ge (c-Ge) are reported. To this aim, we structurally electrically investigated c-Ge samples at different temperatures with 35 keV the high-concentration dopant regime (0.67–25×1020 B/cm3). We elucidated that a high level damage, form amorphous pockets, favors dopant, complete was achieved for properly chosen implant conditions. found, by joining channeling measurements ones, reason incomplete is...

B diffusion measurements are used to probe the basic nature of self-interstitial point defects in Ge. We find two distinct forms---a simple one with low entropy and a complex $\ensuremath{\sim}30\text{ }\text{ }k$ at migration saddle point. The latter dominates high temperature. propose that its structure is similar an amorphous pocket---we name it morph. Computational modeling suggests morphs exist both vacancylike forms, crucial for defect dynamics Ge, Si, probably many other crystalline solids.

Objectives: To evaluate the mechanical properties and metallurgical characteristics of M3 Rotary Pro Gold files (United Dental).Materials Methods: One hundred sixty new (sizes 20/0.04 25/0.04) were used.Torque angle rotation at failure (n = 20) measured according to ISO 3630-1.Cyclic fatigue resistance was tested by measuring number cycles in an artificial stainless steel canal (60° curvature a 5-mm radius).The investigated differential scanning calorimetry.Data analyzed using analysis...

The thermal evolution of large boron-interstitials clusters (BICs) in crystalline Si has been studied by transmission electron microscopy (TEM). After ion implantation (20keV and 1×1014Si∕cm2) annealing (815°C 5min), (6–8nm) have observed correspondence a narrow, highly doped Si:B layer (2×1020B∕cm3). Under prolonged annealing, such dissolve, progressively shrinking their mean size below the TEM detection limit. time BIC is fully compatible with slow path dissolution kinetics recently...