Alberto Vomiero, S. Bianchi, Elisabetta Comini, G. Faglia, Matteo Ferroni, Giorgio Sberveglieri,
Single-crystalline nanowires of indium oxide were produced under controlled conditions via condensation from the vapor phase. Seeding of the substrate through dispersion of metallic indium nanoparticles was proven effective in promoting a nanowire nucleation driven by the vapor−solid process. Nanowires with as small an average lateral dimension as 110 nm were produced, allowing the exploitation of size reduction effects on the electrical properties and the response to gases. Preparation and microstructural ...
Tópico(s): Nanowire Synthesis and Applications
2007 - American Chemical Society | Crystal Growth & Design
Elisabetta Comini, C. Baratto, G. Faglia, Matteo Ferroni, Giorgio Sberveglieri,
ZnO nanowires were deposited using the vapour phase technique. The nanowires cover the substrate and appear uniform in morphology with lengths of up to several micrometres and uniform lateral size of the order of tenths of a nanometre. The electrical and optical properties of ZnO nanowires have been characterized in the presence of nitrogen oxide. Electrical measurements highlight a remarkable response even at low operating temperatures, with detection limits lower than 200 ppb and an optimal operating ...
Tópico(s): Analytical Chemistry and Sensors
2007 - Institute of Physics | Journal of Physics D Applied Physics
Elisabetta Comini, V. Guidi, Matteo Ferroni, Giorgio Sberveglieri,
Monitoring of the gases produced in landfills is a major task nowadays for the environmental safety of the areas neighboring garbage dumps. We approached the problem via solid-state chemoresistive gas sensors to detect typical complex organic gases produced by landfills, i.e., carbon sulfide, methyl sulfide, and xylene. We have tested Ti, W, and Mo mixed-oxide thin films deposited by reactive sputtering and processed through the selective sublimation technique. We recorded a remarkable response ...
Tópico(s): Analytical Chemistry and Sensors
2005 - IEEE Sensors Council | IEEE Sensors Journal
Andrea Ponzoni, Elisabetta Comini, Matteo Ferroni, Giorgio Sberveglieri,
In this work, we present a simple method, based on a modified thermal evaporation technique, to obtain films of nanostructured WO3 with high surface roughness. This method consists on sublimation from a metallic tungsten wire followed by oxidation in low vacuum conditions and reactive atmosphere (pO2 = 0.22 mbar), with substrates heated at high temperature (600 °C). Electron microscopy (SEM, TEM) and atomic force microscopy (AFM) analysis revealed that the deposited films are composed of agglomerates with ...
Tópico(s): Analytical Chemistry and Sensors
2005 - Elsevier BV | Thin Solid Films
Mahnaz Shafiei, J. Yu, R. Arsat, Kourosh Kalantar‐zadeh, Elisabetta Comini, Matteo Ferroni, Giorgio Sberveglieri, W. Włodarski,
In this paper, the effect of electric field enhancement on Pt/nanostructured ZnO Schottky diode based hydrogen sensors under reverse bias condition has been investigated. Current–voltage characteristics of these diodes have been studied at temperatures from 25 to 620 °C and their free carrier density concentration was estimated by exposing the sensors to hydrogen gas. The experimental results show a significantly lower breakdown voltage in reversed bias current–voltage characteristics than the conventional ...
Tópico(s): ZnO doping and properties
2010 - Elsevier BV | Sensors and Actuators B Chemical
Giselle Jiménez-Cadena, Elisabetta Comini, Matteo Ferroni, Giorgio Sberveglieri,
In this paper we describe the synthesis of Cu2O bi-pyramids by reduction of Cu(OH)2 using hydrazine as reducing agent. Copper chloride is used as a precursor to produce copper hydroxide in aqueous solution and the precipitation of the product is controlled by a slow addition of the reducing agent. All the reactions have been carried out at room temperature and atmospheric pressure with high repeatability. The purification process does not require expensive methods since a solid product is obtained ...
Tópico(s): Gas Sensing Nanomaterials and Sensors
2009 - Elsevier BV | Materials Letters
S. Kačiulis, L. Pandolfi, Elisabetta Comini, G. Faglia, Matteo Ferroni, Giorgio Sberveglieri, Sasikaran Kandasamy, Mahnaz Shafiei, Wojtek Wlodarski,
Abstract Nanowires of different metal oxides (SnO 2 , ZnO) have been grown by evaporation–condensation process. Their chemical composition has been investigated by using XPS. The standard XPS quantification through main photoelectron peaks, modified Auger parameter and valence band spectra were examined for the accurate determination of oxidation state of metals in the nanowires. Morphological investigation has been conducted by acquiring and analyzing the SEM images. For the simulation of working ...
Tópico(s): Transition Metal Oxide Nanomaterials
2008 - Wiley | Surface and Interface Analysis
Mahnaz Shafiei, Kourosh Kalantar‐zadeh, W. Włodarski, Elisabetta Comini, Matteo Ferroni, Giorgio Sberveglieri, S. Kačiulis, L. Pandolfi,
Abstract This paper presents material and gas sensing properties of Pt/SnO2 nanowires/SiC metal oxide semiconductor devices towards hydrogen. The SnO2 nanowires were deposited onto the SiC substrates by vapor-liquid-solid growth mechanism. The material properties of the sensors were investigated using scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The current-voltage characteristics have been analyzed. The effective change in the barrier height ...
Tópico(s): Transition Metal Oxide Nanomaterials
2008 - Exeley Inc | International Journal on Smart Sensing and Intelligent Systems
Alessandra Stacchiotti, Antonio Lavazza, Matteo Ferroni, Giorgio Sberveglieri, Rossella Bianchi, Rita Rezzani, Luigi Fabrizio Rodella,
Aluminium (Al) is a ubiquitous metal that is potentially toxic to the brain. Its effects on other fundamental organs are not completely understood. This morphological in vivo study sought to compare sublethal hepatotoxic changes and Al deposition in adult mice that orally ingested Al sulphate daily for 10 months, in age matched control mice that drank tap water and in senescent mice (24 months old). Livers were examined for collagen deposition using Sirius red and Masson, for iron accumulation using ...
Tópico(s): Trace Elements in Health
2008 - Elsevier BV | Experimental Gerontology
Elisabetta Comini, G. Faglia, Matteo Ferroni, Giorgio Sberveglieri,
Tópico(s): Transition Metal Oxide Nanomaterials
2007 - Springer Science+Business Media | Applied Physics A
Elisabetta Comini, V. Guidi, Matteo Ferroni, Giorgio Sberveglieri,
Nowadays, monitoring landfill produced gases (LFGs) is a major task for environmental safety of the areas neighboring garbage dumps.The authors have explored a novel approach to this problem.We have tested solid-state chemoresistive gas sensors to detect typical complex organic gases produced by landfill, i.e., carbon sulfide, methyl sulfide and xylene.We have prepared TiO 2 :Mo, MoO 3 :Ti, TiO + WO 3 and TiO:W mixed-oxides thin films deposited by reactive sputtering and then processed through the selective ...
Tópico(s): Insect Pheromone Research and Control
2004 - Elsevier BV | Sensors and Actuators B Chemical
P. G. Merli, Vittorio Morandi, G. Savini, Matteo Ferroni, Giorgio Sberveglieri,
We show that, in scanning electron microscopy, it is possible to use the secondary electrons produced by the backscattered electrons to obtain chemical information on the dopant distribution in Sb-implanted silicon. Theoretical investigations and experimental data concur to point out that the resolution of the method is defined by the probe size—values of 1 nm or even lower are possible in the present instruments—while the contrast depends on the electron range and on the boundary conditions. A ...
Tópico(s): Thin-Film Transistor Technologies
2005 - American Institute of Physics | Applied Physics Letters
Elisabetta Comini, S. Bianchi, G. Faglia, Matteo Ferroni, Alberto Vomiero, Giorgio Sberveglieri,
Tópico(s): ZnO doping and properties
2007 - Springer Science+Business Media | Applied Physics A
Alberto Vomiero, S. Bianchi, Elisabetta Comini, G. Faglia, Matteo Ferroni, Nicola Poli, Giorgio Sberveglieri,
Thin and densely packed In2O3 nanowires have been synthesised on alumina substrates via transport and condensation method, starting from nanoparticles of indium or palladium as catalysts for the condensation process. Indium catalyst promoted wires growth according to vapour–solid (VS) mechanism, while palladium catalyst leads to wires formation based on vapour–liquid–solid (VLS) condensation. Electron microscopy and related diffraction analysis demonstrated that the wires are monocrystalline, with ...
Tópico(s): Transition Metal Oxide Nanomaterials
2007 - Elsevier BV | Thin Solid Films
Alessandra Sutti, C. Baratto, G. Calestani, Chiara Dionigi, Matteo Ferroni, G. Faglia, Giorgio Sberveglieri,
Focusing here on the effects of zinc doping in a nanocrystalline matrix of tin dioxide, inverse opal prototype sensors are presented and extensively studied as superior candidates for gas sensing applications. Courtesy of factors including controlled porosity, enhanced surface to volume ratio and homogeneous dispersion of species in the crystalline lattice assured by the sol–gel technique, prototype sensors were prepared with high dopant ratios in a range of new compositions. Exploiting their high ...
Tópico(s): Gas Sensing Nanomaterials and Sensors
2007 - Elsevier BV | Sensors and Actuators B Chemical
C. Baratto, Matteo Ferroni, G. Faglia, Giorgio Sberveglieri,
Nanostructured thin films based on indium oxide have been prepared by a modified rheotaxial growth and thermal oxidation (RGTO) deposition technique. The layers were additivated with 8–30% iron in order to stabilize the microstructure and to enhance the sensing properties toward ozone. Microstructural characterization highlighted formation of core–shell structures featuring iron segregation in the outer part of the nanosized agglomerates. Such peculiar morphology resulted in improved gas sensing ...
Tópico(s): ZnO doping and properties
2006 - Elsevier BV | Sensors and Actuators B Chemical
Eliana Ferroni, Nicola Gennaro, Giorgio Costa, Ugo Fedeli, Gentian Denas, Vittorio Pengo, Maria Chiara Corti,
Background Anticoagulation therapy is central for the management of stroke in patients with non-valvular atrial fibrillation (NVAF). Persistence with oral anticoagulation is essential to prevent thromboembolic complications. Methods We performed a population-based retrospective cohort study in the Veneto Region (north-eastern Italy, about 5 million inhabitants) using the regional health system databases. Naïve patients initiating direct oral anticoagulants (DOACs) for stroke prevention in NVAF from ...
Tópico(s): Health Systems, Economic Evaluations, Quality of Life
2019 - Elsevier BV | International Journal of Cardiology
C. Baratto, Elisabetta Comini, Matteo Ferroni, G. Faglia, Giorgio Sberveglieri,
The photoluminescence emission of ZnO nanowires was modified by means of plasma etching, inducing a strong increase in the Near Band Edge emission (NBE) in the UV region (3.26 eV). In contrast, annealing treatment at 600 °C quenched the NBE peak. This opens the possibility to modify the emission properties of ZnO nanowires by means of surface treatment, and is of great importance in view of the application of ZnO as an emitting material. ZnO nanowires were prepared by the vapour phase growth technique ...
Tópico(s): GaN-based semiconductor devices and materials
2013 - Royal Society of Chemistry | CrystEngComm
Caterina Soldano, Elisabetta Comini, C. Baratto, Matteo Ferroni, G. Faglia, Giorgio Sberveglieri,
The present Review opens with an overview of metal oxides and the description of their material properties. The first part mainly deals with various preparation techniques and growth mechanisms, which have been largely developed in the last few decades to fabricate different types of metal oxide nanostructures. The second part, on the other hand, will provide the Reader with an up‐to‐date summary of different applications in which metal oxides nanostructures have been successfully implemented and/ ...
Tópico(s): Electronic and Structural Properties of Oxides
2012 - Wiley | Journal of the American Ceramic Society
Alberto Vomiero, Isabella Concina, Elisabetta Comini, Caterina Soldano, Matteo Ferroni, G. Faglia, Giorgio Sberveglieri,
Among the most interesting features offered by one-dimensional (1D) nanostructured oxides are their functional properties that can be usefully exploited in the field of energy conversion, in applications such as thermoelectrics and excitonic solar cells. Peculiar characteristics of 1D oxide structures with respect to polycrystalline or bulk counterpart, mainly related to their adjustable electronic conduction, render them strong candidates for the next generation of energy conversion devices. Furthermore, ...
Tópico(s): Quantum Dots Synthesis And Properties
2012 - Elsevier BV | Nano Energy
Giselle Jiménez-Cadena, Elisabetta Comini, Matteo Ferroni, Alberto Vomiero, Giorgio Sberveglieri,
Tópico(s): TiO2 Photocatalysis and Solar Cells
2010 - Elsevier BV | Materials Chemistry and Physics
Alberto Vomiero, Andrea Ponzoni, Elisabetta Comini, Matteo Ferroni, G. Faglia, Giorgio Sberveglieri,
A simple and large-area scalable methodology has been set up for direct integration of metal oxide nanowire bundles into a functional device for gas sensing. It is based on sequential application of two consolidated techniques, namely high temperature vapour transport and condensation for fabrication of metal oxide nanowires, and wet etching of a sacrificial layer. The alumina substrate patterned with a silicon dioxide sacrificial layer does not influence the growth of nanowires and remains unaltered ...
Tópico(s): ZnO doping and properties
2010 - IOP Publishing | Nanotechnology
Alberto Vomiero, Isabella Concina, Marta Maria Natile, Elisabetta Comini, G. Faglia, Matteo Ferroni, Iskandar Kholmanov, Giorgio Sberveglieri,
An innovative nanonetwork composed of TiO2 nanoparticles and single-crystalline ZnO nanowires is demonstrated as efficient photoanode in excitonic solar cells. Such architecture benefits of the capability of high sensitizer loading offered by the nanoparticles and of the direct conduction path for electrons guaranteed by the nanowires. The combination of these features leads to improved light absorption, electron photogeneration, and charge collection. The nanonetwork was implemented in a dye-sensitized ...
Tópico(s): TiO2 Photocatalysis and Solar Cells
2009 - American Institute of Physics | Applied Physics Letters
Elisabetta Comini, C. Baratto, G. Faglia, Matteo Ferroni, Alberto Vomiero, Giorgio Sberveglieri,
The continuous evolution of nanotechnology in these years led to the production of quasi-one dimensional (Q1D) structures in a variety of morphologies such as nanowires, core–shell nanowires, nanotubes, nanobelts, hierarchical structures, nanorods, nanorings. In particular, metal oxides (MOX) are attracting an increasing interest for both fundamental and applied science. MOX Q1D are crystalline structures with well-defined chemical composition, surface terminations, free from dislocation and other ...
Tópico(s): Electronic and Structural Properties of Oxides
2008 - Elsevier BV | Progress in Materials Science
V. Guidi, D. Boscarino, L Casarotto, Elisabetta Comini, Matteo Ferroni, G. Martinelli, Giorgio Sberveglieri,
Development of MoO3 as a novel material for gas sensing was addressed. Thin films were produced by reactive rf sputtering assisted by annealing. Doping with Ti was performed to enhance the conductance of the MoO3 film. It came out that the layers were two orders of magnitude more conductive than undoped material. Good and reversible response to CO was achieved at 300°C, which fell off at higher temperatures. An interesting feature of the films was a considerably fast response for both CO and NO2 ...
Tópico(s): Analytical Chemistry and Sensors
2001 - Elsevier BV | Sensors and Actuators B Chemical
V. Guidi, Elisabetta Comini, Matteo Ferroni, G. Martinelli, Giorgio Sberveglieri,
Production of nanosized oxides was reliably accomplished through magnetron radio frequency sputtering of a W/Ti composite target under oxidizing environment. Depending on the temperature at which annealing was carried out, the resulting thin films were either WO3/TiO or W-doped TiO and the semiconductor doping changed from n to p type, respectively. The films were structurally characterized through microscopy techniques. Electrical characterization was executed over the samples. In particular, it ...
Tópico(s): Analytical Chemistry and Sensors
2000 - American Institute of Physics | Journal of Vacuum Science & Technology A Vacuum Surfaces and Films
Alberto Vomiero, Matteo Ferroni, Elisabetta Comini, G. Faglia, Giorgio Sberveglieri,
Radial and longitudinal nanosized In2O3−SnO2 heterostructures were produced by applying a suitable methodology of transport and condensation. Sequential evaporation−condensation over In-seeded alumina promotes the formation of a radial heterostructure, driven by the direct vapor−solid growth mechanism. The single-crystalline In2O3 nanowire nucleates and acts as the backbone for condensation of a polycrystalline SnO2 sheath. Fabrication of longitudinal heterostructures over sapphire is achieved through ...
Tópico(s): Nanowire Synthesis and Applications
2007 - American Chemical Society | Nano Letters
S. Bianchi, Elisabetta Comini, Matteo Ferroni, G. Faglia, Alberto Vomiero, Giorgio Sberveglieri,
We have investigated the sensing properties of indium oxide nanostructures and tailored the deposition conditions in order to obtain nano-wires of indium oxide. We have comparatively tested the gas sensing properties of nano-wires with micrometric or even nanometric size. The micro-wires feature interesting gas sensitivity at room temperature, particularly in the case of nitrogen dioxide detection. The sensing performance is improved as the lateral dimension of the wire decreases.
Tópico(s): ZnO doping and properties
2006 - Elsevier BV | Sensors and Actuators B Chemical
Dario Zappa, Simone Dalola, G. Faglia, Elisabetta Comini, Matteo Ferroni, Caterina Soldano, Vittorio Ferrari, Giorgio Sberveglieri,
Zinc oxide (ZnO, n -type) and copper oxide (CuO, p -type) nanowires have been synthesized and preliminarily investigated as innovative materials for the fabrication of a proof-of-concept thermoelectric device. The Seebeck coefficients, electrical conductivity and thermoelectric power factors (TPF) of both semiconductor materials have been determined independently using a custom experimental set-up, leading to results in agreement with available literature with potential improvement. Combining bundles ...
Tópico(s): Gas Sensing Nanomaterials and Sensors
2014 - Beilstein Institute for the Advancement of Chemical Sciences | Beilstein Journal of Nanotechnology
Alessandra Stacchiotti, Francesca Rovetta, Matteo Ferroni, Giovanni Corsetti, Antonio Lavazza, Giorgio Sberveglieri, Maria Francesca Aleo,
Cisplatin (CisPt) is a widely used chemotherapeutic drug whose side effects include muscle weakness and cachexia. Here we analysed CisPt-induced atrophy in C2C12 myotubes by a multidisciplinary morphological approach, focusing on the onset and progression of autophagy, a protective cellular process that, when excessively activated, may trigger protein hypercatabolism and atrophy in skeletal muscle. To visualize autophagy we used confocal and transmission electron microscopy at different times of ...
Tópico(s): Muscle Physiology and Disorders
2014 - Hindawi Publishing Corporation | Oxidative Medicine and Cellular Longevity