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  • Fausta Loffredo
Fausta Loffredo

Fausta Loffredo
ENEA | ENEA · Technical Unit for Portici Technologies UTTP

PhD

About

76
Publications
7,607
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838
Citations
Citations since 2017
16 Research Items
449 Citations
2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080

Publications

Publications (76)
Article
Full-text available
Pyroelectric energy harvesting is one of the more recent and promising solid-state approaches for directly converting time-dependent temperature fluctuations into electric energy. Conventional printing technologies can offer many advantages for the production of pyroelectric thin-film-based devices, such as low cost, low temperature, the use of fle...
Article
Full-text available
The micropatterning of thin films represents a challenging task, even for additive manufacturing techniques. In this work, we introduce the use of inkjet-printing technology coupled with a gas-foaming process, to produce patterned porosities on polymeric thin films, to develop a bubble-writing method. Inkjet printing of an aqueous solution of poly...
Article
Full-text available
Zinc oxide (ZnO) nanogenerators have attracted increasing interest in the scientific community for use in energy harvesting and mechanical sensing applications. Understanding the interplay between piezoelectricity and semiconductor physics is fundamental to enhancing these devices’ performances, although direct characterization at the nanoscale is...
Article
Full-text available
The efficiency of photomobile polymers (PMP) in the conversion of light into mechanical work plays a fundamental role in achieving cutting-edge innovation in the development of novel applications ranging from energy harvesting to sensor approaches. Because of their photochromic properties, azobenzene monomers have been shown to be an efficient mate...
Article
Abstract: We introduce a new method to obtain gradient index (GRIN) lenses by dual-step process based on interdiffusion oftwo different polymeric solutions and gelation of the final mixture. The aim of the study was investigated a simpleprocess to produce a gel characterized by a continuous axial concentration gradient starting from two thermoplast...
Article
Full-text available
Treatment of vascular disease, from peripheral ischemia to coronary heart disease (CHD), is poised for transformation with the introduction of transient implants designed to “scaffold” regeneration of blood vessels and ultimately leave nothing behind. Improved materials could expand the use of these devices. Here, we examine one of the leading poly...
Article
Full-text available
Zinc oxide (ZnO) nanowires (NWs) are excellent candidates for the fabrication of energy harvesters, mechanical sensors, and piezotronic and piezophototronic devices. In order to integrate ZnO NWs into flexible devices, low-temperature fabrication methods are required that do not damage the plastic substrate. To date, the deposition of patterned cer...
Article
Full-text available
Tungsten disulfide (WS₂) nanotubes (NTs) are examined here as a filler for polylactide (PLA) for their ability to accelerate PLA crystallization and for their promising biocompatibility in relevant to biomedical applications of PLA-WS₂ nanocomposites. In this work, we have studied the structural and thermal properties of PLA-WS₂ nanocomposite films...
Chapter
Nanotechnology has driven the research toward new advanced materials and innovative fabrication methods in different fields including sensing applications. In this framework, chemical graphene-based nanodevices have been developed and characterized for NO2 detection at low concentrations. The chemiresistors have been manufactured by the digital pri...
Chapter
In this work, the possibility of manufacturing chemiresistive volatile organic compounds sensing devices by inkjet printing an aqueous suspension of graphene-like layers on paper substrates has been studied. The electrical responses of the devices have been analyzed upon exposure to ethanol at room temperature in dry ambient and analyzed in terms o...
Conference Paper
Full-text available
Poly(L-lactide) (PLLA) is a semicrystalline, biocompatible and biodegradable polymer widely employed in many applications (food packaging, biomedical devices, drug delivery systems). This work deals with nanocomposites of PLLA and tungsten disulfide (WS2) nanotubes (NTs) as a novel material to obtain thinner and stronger bioresorbable vascular scaf...
Article
In order to assess the performance of solar micro-concentrators, specific methods and protocols need to be developed, tested, and applied. In detail, as in conventional concentration modules, one of the fundamental parameters to consider is the efficiency of optical concentrators. In fact, optical concentrators give fundamental information on the c...
Conference Paper
In this work, the possibility of manufacturing chemiresistive gas sensing devices by inkjet printing different LPE (Liquid Phase Exfoliation) graphene suspensions, formulated in standard organic solvents or aqueous mixtures, on rigid and flexible substrates has been studied. The sensing film has been obtained by printing a different number of graph...
Article
Full-text available
The extremely high sensitivity to the external environment and the high specific surface area, as well as the absence of bulk phenomena that could interfere with the response signal, make graphene highly attractive for the applications in the field of sensing. Among the various methods for producing graphene over large areas, liquid phase exfoliati...
Article
Full-text available
We report on the detailed electrical investigation of all-inkjet-printed thin-film transistor (TFT) arrays focusing on TFT failures and their origins. The TFT arrays were manufactured on flexible polymer substrates in ambient condition without the need for cleanroom environment or inert atmosphere and at a maximum temperature of 150 °C. Alternative...
Patent
The patent refers to a device for the indirect measurement of a physical/chemical parameter of a work environment, calculated on the basis of a remote characterization of the electromagnetic state of a transponder located in that environment, influenced in a known and measurable way from such parameter
Article
In this paper, we report the study on a new protocol for the immobilization process of antigen/antibody assay on SU-8 layers by oxygen plasma treatment. Plasma treatments, at different plasma powers and for different duration times, are performed and their effects on immobilization efficiency are studied. The chemical properties and the surface mor...
Article
The variations in physical parameters of an organic field-effect transistor having dioctylbenzothieno[2,3-b]benzothiophene (C8BTBT) as the channel semiconductor were investigated under different light irradiation conditions at wavelengths of 350 nm, 370 nm, 400 nm and by increasing exposure doses. The progress of the electro-optical history of the...
Article
All-inkjet-printed thin-film transistors (TFTs) have been demonstrated in literature using mainly laboratory inkjet equipment, simple one-channel layout and only a low number of manufactured TFT devices. We report on the development and the up-scaling of the manufacturing of all-inkjet-printed TFT arrays using industrial inkjet equipment. The manufa...
Article
In this work, FETs are used as a research tool to study charge carrier mobilities in PbS nanocrystals (NCs) thin-films employed as semiconducting layer in bottom-gate bottom-contact (BGBC) field-effect transistors (FETs). The as-synthesised NCs are surrounded by long alkyl chain ligands which act as electrical insulators. Therefore, a ligand exchan...
Article
Full-text available
The pyro-electrohydrodynamic (EHD) manipulation of liquids has been discovered and demonstrated recently as a high resolution printing technique avoiding the use of nozzles and external electrodes. The activation of the pyro-electric effect is usually achieved on ferroelectric crystals by an external heating source or by an infrared laser. Here, we...
Conference Paper
Full-text available
In this work, we report on the inkjet printing as potential technology to manufacture chemi-resistors based on liquid phase exfoliated graphene. With respect to the conventional solution-processable methods, the main IJP capability is related to the deposition of small ink volumes that entails a more controlled drying process. This specific potenti...
Conference Paper
In the recent years many commercial applications such as optoelectronics, photonic and biomedical devices, as well as image processing require the fabrication of adaptive and adjustable micro-lens array. A lot of attempts have been conducted in order to support the growing interest in the production of lens arrays for sensors or optical communicati...
Conference Paper
In this work we present a direct printing of microlenses using high viscous polymer materials. In particular the pyro-electric effect activated onto a Lithium Niobate crystal is exploited for the fabrication on demand of microlens array.
Article
Organic thin film phototransistor (OPTs) devices in bottom-gate/top-contact configuration were fabricated and used as analytic system to study the electrical and optical properties of pentacene. The channel of the OTFT devices was illuminated by laser radiation of wavelength 670 nm and the effect of irradiation on the electrical responses of the de...
Article
In the present work, bottom-gate top-contact organic field effect transistors (OFETs) were fabricated by evaporating a pentacene semiconductor film on top of a new insulating poly(methyl methacrylate) (PMMA) copolymer containing methacrylate units. The PMMA copolymer was synthesized in order to combine the well-known insulating properties of PMMA w...
Article
Full-text available
In the present work, the pyro-electrohydrodynamic technique was used for the realization of tunable-size microlens arrays. Poly(methyl methacrylate) dissolved in different solvent mixtures was used as the polymeric material for the realization of the microstructures. By controlling the experimental parameters and in particular, the volume of the dr...
Article
Full-text available
In this article, we describe the development of poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)‐based ink for the fabrication of indium tin oxide (ITO)‐free polymer solar cells (PSCs). The ink consisted of PEDOT:PSS, suitably doped with dimethyl sulfoxide (DMSO) in solution. The printed PEDOT:PSS showed electrical conductivity...
Article
In the present work, the transport mechanism of organic transistors with bottom-gate/top-contact structure, manufactured by employing traditional and inkjet printing techniques, was studied. Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) conductive polymer was used for realizing printed source, drain and gate electrodes. The i...
Article
In the present work, the transport mechanism of organic transistors with bottom-gate/top-contact structure, manufactured by employing traditional and inkjet printing techniques, was studied. Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) conductive polymer was used for realizing printed source, drain and gate electrodes. The i...
Article
In the present work, we investigated the bias stress (BS) effect taking place in inkjet-printed n-type N,N'-bis(n-octyl)-1,6-dicyanoperylene-3,4:9,10-bis(dicarboximide) (PDI8-CN2) transistors fabricated on SiO2 gate dielectric. PDI8-CN2 films were deposited from solvent systems able to improve the layer structural uniformity. These devices were fou...
Article
Recently, great interest has been devoted to cost-effective alternative energy sources such as organic solar cells because of the mechanical flexibility and the versatility of chemical structure, the low cost of fabrication, and ease of processing. As regards this last point, the possibility to deposit organic materials from solutions at low temper...
Conference Paper
Full-text available
Actually the most promising polymer solar cell architecture utilizes ITO as transparent conductve anodic electrode. The limited flexibility of ITO and the increasing cost of indium make this kind of electrode not desirable for realizations of low-cost and flexible solar cells. For this reason, it is necessary to develop low-cost, highly flexible an...
Article
Full-text available
The investigation of a method for fabricating microlenses by a nozzle-free inkjet printing approach is reported. The new method, based on a pyroelectrohydrodynamic mechanism, is also able to dispense viscous liquids and to draw liquid phase drops directly from the reservoir. Specifically, by dispensing optical grade polymer dissolved in different s...
Article
Metal-insulator-semiconductor (MIS) capacitors based on pentacene semiconductor and CYTOP polymeric dielectric were realized and characterized by capacitance-frequency measurements (C-F) under dark and light conditions at different aging times. The devices showed good responses under light radiation at zero time and a strong degradation of the perf...
Article
Here the pyroelectric functionality of a Lithium Niobate (LN) substrate is used for non-contact manipulation of liquids. In this work we introduced the use of a pyro-electrohydrodynamc (PEHD) dispenser for the manipulation of high viscous polymer materials leading to the fabrication of arrays of microlenses. The set-up used for the experiment is de...
Article
In this paper we used the inkjet printing technology to deposit some of the layers that are crucial for the performance of polymer solar cells: the anode and the photoactive film. In particular, we investigated how the ink composition and the printing parameters (drop emission frequency, drops overlapping degree, substrate temperature) affect the e...
Article
Volatile organic compound (VOC) chemical sensors increasingly rely on the use of polymer nanocomposites (PNCs) as sensing materials, thanks to the simple processability of polymers combined with the conductivity properties of nanoparticles dispersed in an insulating polymer matrix. Recently, inkjet printing (IJP), the main advantage of which is its...
Article
The inkjet printing (IJP) technique is gener-ally used as tool for positioning small quantities of a liquid material on a target substrate. An interesting application of IJP is inkjet etching that consists of the deposition of drops of solvent or solvent mixtures onto a soluble polymer layer. This technique allows one to structure the polymer film...
Article
Full-text available
We developed and characterized inks based on dispersions of N-doped titanium dioxide (TiO 2) in pol-yethylenimine (PEI)/ethanol solutions with chemicophysi-cal properties suitable for the ink-jet printing process. In detail, we prepared suspensions by varying the concentra-tion of the polymeric dispersant to investigate the effect of the dispersant...
Article
Recently, the inkjet printing (IJP) technology was advised as a direct method for the fabrication of high-quality and high-precision microlenses overcoming the drawbacks of the traditional techniques which usually require multiple complex processing steps making the fabrication costly. IJP has the great advantage to be extremely versatile in defini...
Article
Full-text available
In this work, we report on ink-jet manufactured chemical sensors based on polymer carbon black composites. In particular, in order to study the correlation between ink-jet pattern geometry and device response sensors characterized by sensing layers consisting of polystyrene/carbon black composites lines of various shape and surfaces were fabricated...
Article
The interference effects generated in a bottom-emitting electroluminescent device fabricated on a polymer underlayer introduced with the aim of improving the anode roughness have been studied. The analysis of the interference fringes at different detection angles and the spatial coherence demonstrates that this phenomenon is due to multiple interna...
Article
A soluble polymer layer can be structured by means of solvent drops etching. The inkjet etching (IJE), innovative technique that consists of ejecting liquid material in controlled manner in terms of both volume amount (10–100 pL) and positioning on the substrate (μm resolution), allows to manufacture suitable shaped microstructures on top of polym...
Article
Full-text available
We report the development and characterization of dielectric inks based on dispersions of TiO2 in poly(ethylenimine)/ethanol solutions having physicochemical properties suitable to ink-jet printing process. In order to study the effect of polymer dispersant on the printability and stability of inks, we carried out dynamic light scattering analysis...
Conference Paper
Polymer nanocomposites (PNCs) are attractive as sensing materials in volatile organic compounds (VOCs) chemical sensors because they combine the simple processability of polymers together with the conductivity properties of nanoparticles dispersed in the insulating polymer matrix. Recently, these materials are easily processed by inkjet printing (H...
Conference Paper
Polymer nanocomposites (PNCs) are attractive as sensing materials in volatile organic compounds (VOCs) chemical sensors because they combine the simple processability of polymers together with the conductivity properties of nanoparticles dispersed in the insulating polymer matrix. Recently, these materials are easily processed by inkjet printing (I...
Article
Here we report on ink-jet manufactured chemical sensors based on polymer-carbon black composites. Both sensing elements and electrical contacts have been made by ink-jet on alumina substrates. Filler dispersions, films morphology, electrical properties and time stability of devices have been investigated.Sensors have been tested at increasing aceto...
Article
In this work, we present a hybrid multisensor system equipped with sensor fusion architectures for continuous gas concentration estimation, in a gas mixture scenario. Complex gas mixtures pose significant issues to quantification capability of room temperature operating sensors due to the often poor stability and selectivity of this class of device...
Article
Full-text available
In this work, we present a hybrid multisensor system equipped with sensor fusion architectures for continuous gas concentration estimation, in a gas mixture scenario. Complex gas mixtures pose significant issues to quantification capability of room temperature operating sensors due to the often poor stability and selectivity of this class of device...
Article
We report on the fabrication process of a sensing device obtained by ink-jet printing of polyaniline suspension on alumina substrates. We optimized the inkjet parameters (amplitude and duration of jetting impulse, jetting frequency, substrate velocity) to obtain thin polyaniline lines as sensitive layers and we analyzed the morphology of PANI lines...
Article
Full-text available
In this work, a wireless electronic nose prototype, called TinyNose, hosting an array of four different polymeric-composite sensors developed at ENEA, is presented. Sensors are fabricated using a carbon black conducting phase dispersed in different polymeric matrices. The prototype has shown interesting results for VOC compounds detection and discr...
Article
The fabrication process of multiple sensing devices on a single Al2O3 substrate will be studied step by step aiming to identify the most critical ones to obtain devices with better performances. Steps analysis have been performed by DLS, optical microscopy, two- and four-point probe measurements, and finally testing the device responses towards VOC...
Article
We report on the fabrication process of a polymer sensing device based on a thin film composite obtained by spinning or casting a carbon fillers/thermoplastic polymer dispersion on a glass substrates. In this work we produce thin composite films characterized by different grade of dispersion of carbon black in polymer matrix (Poly(methyl-methacryla...
Article
In this work, we produce thin composite films characterized by different grade of dispersion of carbon black in polymer matrix (Poly(methyl-methacrylate) and Poly(2 hydroxy-ethyl-methacrylate)). These samples are obtained changing some process parameters (viscosity of polymer solution and type of spinning deposition) or using different conductive f...
Article
The working principle of composite polymer vapor sensors is basically to exploit the vapor absorption properties of an insulating polymer whose electrical properties are modulated by a conductive “filler”. Carbon black and graphite powder have already been used as “filler” materials [Sens. Actuators B87 (2002) 130, Anal. Chem. 74 (2002) 1307, Sens....
Conference Paper
The morphology and the gas sensitive properties of composite thin films have been studied in this work realizing and characterizing resistive sensing devices working at room temperature. Poly(methyl-methacrylate), atactic poly(styrene), poly-(2-hydroxy ethyl methacrylate) have been used as polymeric insulating matrix. Graphite, commercial carbon bl...
Conference Paper
In this work we investigate a poly(aniline) gas sensor device characterized by good responses to few ppm of ammonia in air at different humidity levels. Properly doped emeraldine films also exhibit strong photoluminescence when exposed to ammonia vapors. The physical mechanism at the base of poly(aniline) sensitivity, optical and electrical, is inv...
Article
Cosyndiotactic random copolymers of styrene/p-chlorostyrene (S/p-CS) have been prepared for the entire composition range. Their polymorphic behavior has been studied by means of wide-angle X-ray diffraction, differential scanning calorimetry, Fourier transform infrared spectroscopy, and ultraviolet spectroscopy. For all samples, the possible format...
Article
The possible formation of clathrate phases with several different guest molecules for co-syndiotactic random copolymers of styrene and p-methylstyrene has been investigated. In the presence of suitable guests, like carbon disulfide and tetrahydrofuran, clathrate phase are stable for the entire copolymer composition range. However, discontinuous cha...
Article
Clathrates with tetrahydrofuran of styrene-p-methyl styrene co-syndiotactic copolymers have been characterized by wide-angle X-ray scattering and differential scanning calorimetry. Stable clathrate structures with THF molecules have been observed in whole range of composition. In particular, syndiotactic polystyrene like and syndiotactic poly-p-met...
Article
Chemical separations based on absorption phenomena into syndiotactic polystyrene samples including a nanoporous crystalline phase are described. These separation phenomena are due to the presence into the crystalline phase of cavities whose size and shape have been studied through sorption experiments relative to linear hydrocarbons and through cal...

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