Vittorio Morandi

Vittorio Morandi
Italian National Research Council | CNR · Institute for Microelectronics and Microsystems IMM

About

208
Publications
36,832
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6,170
Citations
Additional affiliations
January 2005 - present
Italian National Research Council
Position
  • CNR - Consiglio Nazionale delle Ricerche

Publications

Publications (208)
Article
In this work keratin/polylactic acid (PLA) 50/50 wt blend nanofibers with different loadings of graphene-oxide (GO) were prepared by electrospinning and tested as delivery systems of Rhodamine Blue (RhB), selected as a model of a drug. The effect of GO on the electrospinnability and drug release mechanism and kinetics was investigated. Rheological...
Article
Oxygen evolution reaction (OER) is known as bottleneck problem during the water splitting process due to high energy barrier and non-availability of efficient nonprecious electrocatalysts. The cobalt oxide (Co3O4) in the spinel phase has limited OER activity and stability in the alkaline media. For this purpose, we have carried out the synthesis of...
Article
Photogeneration of Reactive Oxygen Species (ROS) finds applications in fields as different as nanomedicine, art preservation, air and water depollution and surface decontamination. Here we present photocatalytic nanoparticles (NP) that are active only at acidic pH while they do not show relevant ROS photo‐generation at neutral pH. This dual respons...
Article
Full-text available
The precursors have significant influence on the catalytic activity of nonprecious electrocatalysts for effective water splitting. Herein, we report active electrocatalysts based on cobalt oxide (Co3O4) hierarchical nanostructures derived from four different precursors of cobalt (acetate, nitrate, chloride, and sulfate salts) using the low‐temperat...
Article
Strong demand for renewable energy resources and clean environments have inspired scientists and researchers across the globe to carry out research activities on energy provision and conversion, as well as storage devices. In this context, development of outperform, stable, and durable electrocatalysts has been identified as one of the major object...
Article
Energy‐storage materials can be assembled directly on the electrodes of a battery using electrochemical methods, this allowing sequential deposition, high structural control, and low cost. Here, a two‐step approach combining electrophoretic deposition (EPD) and cathodic electrodeposition (CED) is demonstrated to fabricate multilayer hierarchical el...
Article
Excitation of pyrene chromophores attached at the periphery of copper indium sulfide (CIS) QDs results in efficiently sensitized red-emission of the nanocrystals.
Article
The development and the characterization of a nanostructured binder-free anode for lithium-ion batteries exploiting the germanium high theoretical specific capacity (1624 mAh g⁻¹ for Li22Ge5 alloy) is herein presented. This anode secures remarkable performances in different working conditions attaining a 95% capacity retention at 1C (i.e., 1624 mA...
Article
Full-text available
Driving oxygen evolution reaction (OER) at extremely low overpotential and the blockage of oxygen gas inside the catalytic material leads to the deactivation of catalytic activity, therefore it is an essential step in electrochemical energy conversion systems, but still very challenging task. The clay minerals including bentonite and kaolinite are...
Article
Designing an efficient electrocatalyst for the oxygen evolution reaction (OER) in alkaline media is highly needed but very challenging task. Herein, we used organic polyelectrolytes such as (carboxymethyl cellulose) CMC and polyacrylamide polymers for the growth of Co3O4 nanostructures by aqueous chemical growth method. The morphology and compositi...
Article
Oxygen Evolution Reaction Most transition metal oxides undergo in situ catalyst reconstruction during the oxygen evolution reaction in alkaline media. The reconstruction results in a positive or a negative effect on the catalyst performance. In article number 2101324, Alberto Vomiero and co-workers report the in situ electrochemical transformations...
Article
The reversible and fatigue-resistant photoswitching of azobenzene chromophores is preserved at the surface of silicon nanocrystals; a photosensitized Z → E photoisomerization of azobenzene is observed upon selective excitation of the silicon core.
Article
This work presents the design and validation of a measuring instrumentation for an easy, complete, and tunable characterization of chemiresistive gas sensors based on metal-oxide semiconductors. The equipment, described in depth both as hardware and as software, was designed to monitor the electrical behavior of gas sensors in controlled thermodyna...
Article
Full-text available
The sluggish kinetics of the oxygen evolution reaction (OER) is the bottleneck for the practical exploitation of water splitting. Here, the potential of a core–shell structure of hydrous NiMoO4 microrods conformally covered by Co3O4 nanoparticles via atomic layer depositions is demonstrated. In situ Raman and synchrotron‐based photoemission spectro...
Article
Full-text available
The design of oxygen evolution reaction (OER) electrocatalysts based on Earth-abundant materials holds great promise for realizing practically viable water-splitting systems. In this regard, two-dimensional (2D) nonlayered materials have received considerable attention in recent years owing to their intrinsic dangling bonds which give rise to the e...
Article
The development of semiconductor polymers for electronic applications requires tailored synthetic strategies to obtain materials with tunable electronic properties and morphology to enhance their properties. Towards this goal, here is reported the expedient synthesis of a novel class of thiophene‐based electrochromic polymers, processable in organi...
Article
Spurred by controversial literature findings, we enwrapped reduced graphene oxide (rGO) in ZnO hierarchical microstructures (rGO loadings spanning from 0.01 to 2 wt%) using an in situ synthetic procedure. The obtained hybrid composites were carefully characterized, aiming at shining light on the possible role of rGO on the claimed increased perform...
Article
Full-text available
For an active hydrogen gas generation through water dissociation, the sluggish oxygen evolution reaction (OER) kinetics due to large overpotential is a main hindrance. Herein, a simple approach is used to produce composite material based on TiO2/Co3O4 for efficient OER and overpotential is linearly reduced with increasing amount of TiO2. The scanni...
Article
Mixed-metal olivine cathode materials are one of the most promising systems in the field of lithium batteries. Their main drawback is their low electronic conductivity, which limits the current rate at which they can be cycled. Herein, the effect on electrochemical properties of vicariant high-valence transition metals (HVTMs) inserted in the olivi...
Article
Full-text available
It can be difficult to know where to begin when considering the research opportunities of a material with such outstanding potential as graphene. When searching for a “killer application,” the researcher often neglects to query the world around them, forgetting that nature has been evolving for billions of years to elegantly solve every day problem...
Article
Full-text available
In article number 2007458, Meganne Christian, Raffaello Mazzaro, and Vittorio Morandi analyze the bioinspired design of graphene‐based materials. The molecular structure of graphene resembles a natural honeycomb; moreover, thanks to the versatility of this amazing 2D material, it can also be shaped into honeycomb‐like microstructures with wide‐rang...
Article
Thin films of Al, and Co or Ni based Layered Double Hydroxides (LDH) have been electrochemically deposited on four different supports (Grafoil, Toray Carbon Paper, Carbon Cloth and Nickel Foam) through a potentiostatic or a potentiodynamic approach. The obtained films have been fully characterized to compare their properties in dependence on the di...
Article
Full-text available
Catalysts capable of improving the performance of oxygen evolution reaction (OER) and oxygen reduction reactions (ORR) are essential for the advancement of renewable energy technologies. Herein, Ag-decorated vertically aligned MoS2 nanoflakes are developed via magnetron co-sputtering and investigated as electrocatalyst towards OER and ORR. Due to t...
Article
The water oxidation in alkaline media is a kinetically sluggish process and it requires an active electrocatalyst for overall water splitting which is a challenging task to date. Herein, we formulate a platform for the design of efficient NiCo2S4/C nanocomposite using earth abundant and nonprecious materials. The nanocomposites are prepared by scal...
Article
Full-text available
Molybdenum sulfide (MoS2) has emerged as a promising catalyst for hydrogen evolution applications. The synthesis method mainly employed is a conventional hydrothermal method. This method requires a longer time compared to other methods such as microwave synthesis methods. There is a lack of comparison of the two synthesis methods in terms of crysta...
Article
An electrochemical synthesis which has been optimized to produce layered double hydroxides (LDHs) intercalated with carbon nanomaterials is proposed for the first time. It is based on a one-step procedure which contemporaneously allows for the Ni/Al-LDH synthesis, the reduction of graphene oxide (ERGO) and its intercalation inside the structure. Th...
Article
Humidity sensors have been gaining increasing attention because of their relevance for well-being. To meet the ever-growing demand for new cost-efficient materials with superior performances, graphene oxide (GO)-based relative humidity sensors have emerged recently as low-cost and highly sensitive devices. However, current GO-based sensors suffer f...
Article
Full-text available
Zinc Oxide nanostructured thin films were grown by a novel plasma assisted vapour deposition method, which aims to combine the versatility of deposition processes that are mediated by plasma with the capability to control particles diffusion and nucleation. For this purpose, the proposed approach spatially separates into two different vacuum chambe...
Article
Full-text available
We investigated the photocatalytic behavior of gold nanoparticles supported on CeO2-TiO2 nanostructured matrices in the CO preferential oxidation in H2-rich stream (photo CO-PROX), by modifying the electronic band structure of ceria through addition of titania and making it more suitable for interacting with free electrons excited in gold nanoparti...
Article
Hydrogen production via light-driven water splitting is a key process in the context of solar energy conversion. In this respect the choice of suitable light-harvesting units appears as a major challenge, particularly as far as stability issues are concerned. In this work we report on the use of CdTe/CdS QDs as photosensitizers for light-assisted h...
Article
Full-text available
There are many challenges associated with the fabrication of efficient, inexpensive, durable and very stable nonprecious metal catalysts for the hydrogen evolution reaction (HER).
Article
In this paper we report about the synthesis and characterization of graphene oxide (GO). We monitor the effects of the different synthetic processes on the morphological and structural properties of the materials. A modified Hummers' method is adopted to obtain GO powder; H2SO4 is employed as intercalating agent, to increase the distance between gr...
Article
Full-text available
Rechargeable batteries based on magnesium virtually provide high volumetric capacity, safety, and cost savings thanks to the abundance, dendrite-free electrodeposition, and environmentally green properties of Mg metal anode. The lack of cathodes that can deliver high currents at high potential is one of the principal bottlenecks that limit the entr...
Article
Luminescence based imaging is a powerful tool in biological research and for clinical applications. Optical probes based on silicon nanocrystals (SiNCs) have many advantages compared to more conventional quantum dots based on heavy metals: abundancy of silicon combined with its biocompatibility; tunability of SiNCs emission color in the red and NIR...
Article
Full-text available
The use of Mg as hydrogen storage material is hampered by slow sorption kinetics and high thermodynamic stability. This work reports on biphasic Mg-Ti-H nanoparticles outperform known Mg-based materials in both respects. By exploiting gas-phase condensation of Mg and Ti vapors under He/H2 atmosphere, < 20 nm nanoparticles are grown, in which the bu...
Article
Full-text available
We present an overview of the main techniques for production and processing of graphene and related materials (GRMs), as well as the key characterization procedures. We adopt a 'hands-on' approach, providing practical details and procedures as derived from literature as well as from the authors' experience, in order to enable the reader to reproduc...
Preprint
Full-text available
Oligothiophenes are pi-conjugated semiconducting and fluorescent molecules whose self-assembly properties are widely investigated for application in organic electronics, optoelectronics, biophotonics and sensing. We report here an approach to the preparation of crystalline oli-gothiophene nano/micro-fibers based on the use of a sulfur overrich quat...
Article
Full-text available
Self-standing, 1-dimensional (1D) structures of p-type metal oxide (MOx) have been the focus of considerable attention, due to their unique properties in energy storage and solar light conversion. However, the practical performance of p-type MOx is intrinsically limited by their interfacial defects and strong charge recombination losses. Single cry...
Article
Layered double hydroxides (LDHs) have been widely studied for their plethora of fascinating features and applications. The potentiostatic electrodeposition of LDHs has been extensively applied in literature as a fast and direct method to substitute classical chemical routes. However, the electrochemical approach does not usually allow for a fine co...
Article
One of the key challenges in materials science is to control the properties of a material by directing its supramolecular arrangement. Here, we show that through nanoprecipitation method Iridium complexes, such as FIrpic, Ir-PPY and Ir-MDQ, can be organized into crystalline and phosphorescent nanoparticles allowing to thoroughly modify their functi...
Article
Full-text available
Here we present a suitable advancement of parallel local oxidation nanolithography, demonstrating its feasibility in alternate current mode (AC-PLON). For demonstration, we fabricated model structures consisting of an array of...
Article
Self-powered photodetectors operating in the UV-visible-NIR window made of environmentally friendly, earth abundant, and cheap materials are appealing systems to exploit natural solar radiation without external power sources. In this study, we propose a new p-n junction nanostructure, based on a ZnO-Co3O4 core-shell nanowire (NW) system, with a sui...
Article
Within the class of two-dimensional materials, transition metal dichalcogenides (TMDs), are extremely appealing for a variety of technological applications. Moreover, the manipulation of the layered morphology at the nanoscale is a knob for further tailoring their physical and chemical properties towards target applications. Here, the combination o...
Article
Full-text available
Hydrogen evolution reaction through electrolysis holds a great potential as a clean, renewable and sustainable energy source. Platinum-based catalysts are the most efficient to catalyze and convert water into molecular hydrogen, however their large-scale application is prevented by scarcity and cost of Pt. In this work, we propose a new ternary com...
Article
During the last decade, electrochemical exfoliation of graphite has aroused great interest from both academia and industry for mass production of graphene sheets. Electrochemically exfoliated graphene oxide (EGO) features a much better tunability than chemically exfoliated GO, or even than graphene obtained with ultrasonic exfoliation. Chemical and...
Article
This communication describes the bionic preparation of a composite material in which fluorescent magnetite nanoparticles are included within the calcitic skeletal structure of the foraminifera Amphistrigina lessoni. This research represents...
Article
Bright and non-toxic quantum dots (QDs) are highly desirable in a variety of applications, from solid-state devices to luminescent probes in assays. However, the processability of these species is often curbed by their surface chemistry, which limits their dispersibility in selected solvents. This renders a surface modification step often mandatory...
Article
A novel and enhanced electrosynthesis protocol that allows the deposition of thin films of Co/Al and Co/Fe layered double hydroxides (LDHs) on different supports is hereby proposed. The approach is based on a potentiodynamic cathodic reduction. All the films have been characterized by CVs, powder X-ray diffraction, scanning electron microscopy, and...
Article
Overall water splitting represents one of the most promising approaches toward solar energy conversion and storage, which is, however, severely challenged by the four-electron/four-proton nature of the oxygen evolution reaction (OER). One option to overcome this issue is to replace OER with a more useful reaction, for simultaneous production of bot...
Article
Full-text available
Major breakthroughs in batteries would require the development of new composite electrode materials, with a precisely controlled nanoscale architecture. However, composites used for energy storage are typically a disordered bulk mixture of different materials, or simple coatings of one material onto another. We demonstrate here a new technique to c...
Article
Full-text available
Metallic nanoparticles (NPs), either supported on a porous oxide framework or finely dispersed within an oxide matrix, find applications in catalysis, plasmonics, nanomagnetism and energy conversion, among others. The development of synthetic routes that enable to control the morphology, chemical composition, crystal structure and mutual interactio...
Article
Full-text available
Hydrogen production as alternative energy source is still a challenge due to the lack of efficient and inexpensive catalysts, alternative to platinum. Thus, stable, earth abundant and inexpensive catalysts are of prime need for hydrogen production via hydrogen evolution reaction (HER). Herein, we present an efficient and stable electrocatalyst comp...
Article
Full-text available
There are tens of industrial producers claiming to sell graphene and related materials (GRM), mostly as solid powders. Recently the quality of commercial GRM has been questioned, and procedures for GRM quality control were suggested using Raman Spectroscopy or Atomic Force Microscopy. Such techniques require dissolving the sample in solvents, possi...
Article
Full-text available
We present an overview of the main techniques for production and processing of graphene and related materials (GRMs), as well as the key characterization procedures. We adopt an "hands-on" approach, providing practical details and procedures as derived from literature as well as from the authors' experience, in order to enable the reader to reprodu...
Article
Layered double hydroxides (LDHs) have been combined with graphene and/or carbon nanotubes to prepare new composite materials with fascinating electrochemical features. For the first time, this work describes the development of an electrosynthesis protocol that allows the deposition of thin films of a Ni/Al LDH on glassy carbon electrodes previously...
Article
Metal-organic composites are of great interest for a wide range of applications. The control of their structure remains a challenge, one of the problems being a complex interplay of covalent and supramolecular interactions. This paper describes the self-assembly, thermal stability and phase transitions of ordered structures of silver atoms and thio...
Article
The development of novel materials for enhanced electrochemical energy storage applications, in particular for the fabrication of supercapacitors (SCs) displaying increased properties, is a milestone of both fundamental and technological relevance. Among nanostructured materials, polyoxometalates (POMs) combined with various carbon-based nanostruct...
Article
Magnetic Fe3O4 (magnetite) nanoparticles are synthesized via a chemical precipitation route in different alkaline environments (NH3 or NaOH) and subsequently functionalized with a (propynylcarbamate)triethoxysilane moiety, with the aim of promoting the nucleation and subsequent stabilization of gold nanoparticles. The propynylcarbamate group is abl...
Article
Full-text available
Oligothiophenes are π‐conjugated semiconducting and fluorescent molecules whose self‐assembly properties are widely investigated for application in organic electronics, optoelectronics, biophotonics, and sensing. Here an approach to the preparation of crystalline oligothiophene nano/microfibers is reported based on the use of a “sulfur overrich” qu...
Article
Graphene and graphene substrates display properties that have a huge potential as material interface for device and biomedical tools targeting the modulation or recovery of brain functionality. However, to be considered a reliable neural interface, graphene derived substrates should properly interact with astrocytes, favoring their growth and avoid...
Article
Three-dimensional (3D) graphene based architectures can combine the two-dimensional properties of graphene with the high surface-to-volume ratio required for a large variety of technological applications. We present a spectro-microscopy study of stable micro-porous 3D few-layer graphene structures with a very low density of defects/edges and of uns...
Conference Paper
Graphene oxide was used as charge able to confer high selectivity to the final product. A self-assembling technique, namely layer-by-layer has been developed to stratify graphene-based coating on polymeric films; this coating is composed by nanolayers of graphene oxide alternated with polymers, bonded each other by electrostatic forces. Permeabilit...
Article
Full-text available
The development of next-generation electronics is very dependent on the discovery of materials with exceptional surface-state spin and valley properties. Bismuth has most of the characteristics required for technological development in this field. Thin films of this element have shown nontrivial topology enabling their definition as a topological i...
Article
A controlled and eco-friendly, scalable CVD method for the production of single and few layer MoS2 crystals is proposed. The MoS2 crystals are fabricated at atmospheric pressure through the reaction of pre-deposited sodium molybdate (Na2MoO4) in solution and elemental sulfur at 800 °C, offering the flexibility to achieve two growth regimes -either...