The functionality, architecture and design of a VLSI array processor for list intersection is pre... more The functionality, architecture and design of a VLSI array processor for list intersection is presented. A NMOS implementation on a 5×5 mm2 chip, with lambda rules using a 2.5 μm line witdth process is considered. The resulting chip, totaling 55,000 transistors, is organized in 16 comparison and 15 supply cells operating cuncurrently. Limits and potentialities of the processor are discussed.
2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe), 2019
The need for low cost power sources was always the scope of researchers, especially for applicati... more The need for low cost power sources was always the scope of researchers, especially for applications such as Wireless sensor networks (WSN), where the maintenance and replacement of energy storage units is costly. In this sense, energy harvesting (EH) is more reliable and cheaper due to its unlimited availability. Though, the environment conditions are usually unpredictable, which requires a specialized circuit to be used with the energy harvesters to ensure the efficient power transfer and to adapt to the variable conditions. The proposed system is a specialized EH circuit for the fluttering wind harvester. It consists of an AC/DC buck-boost converter, controlled by a low power microcontroller which adapts the performance according the variable wind conditions, giving an edge over commercial circuits for the same purpose.
Good driving behavior is a significant factor for road safety and green mobility. A countermeasur... more Good driving behavior is a significant factor for road safety and green mobility. A countermeasure to overcome the coarse driving behavior and a methodology to captivate optimal driving traits are discussed in this work. For which, the serious games concept was exploited to improvise the driver performance by deploying diversified game logics (scores, incentives and live game for performance evolution) on a smartphone-based user interface. The application was tested in ASTA ZERO (Active Safety Test Area) in Sweden. The tests comprised of variations (good and bad driving behavior) in driving pattern for analyzing the impact of the application on the driver performance.
ABSTRACT The ultra-short pulse propagation in Gallium Arsenide (GaAs) structures can be modeled t... more ABSTRACT The ultra-short pulse propagation in Gallium Arsenide (GaAs) structures can be modeled through the Piecewise Linear Recursive Convolution (PLRC) technique in the context of the Finite-Difference Time-Domain (FDTD) solution of Maxwell's equations. Our model is based on a Lorentzian formulation of dispersive media, taking into account the Raman, Kerr and Two-Photon Absorption nonlinearities. Soliton propagation in the presence of nonresonant nonlinear effects with fast time response in semiconductors is investigated.
ABSTRACT A physical system where nanometer sized gold particles are embedded within an ultrathin ... more ABSTRACT A physical system where nanometer sized gold particles are embedded within an ultrathin organic film has been built by exploiting the self-ordering properties of Langmuir-Blodgett films. Dipalmitoyl-Phosphatidyl-Ethanolamine (DPPE) molecules, functionalised with gold atomic clusters, have been mixed in various proportions with cadmium arachidate and alkanes, and hence deposited onto a substrate. The conformational properties of films obtained onto mica and glass substrates have been investigated by means of atomic force microscopy and scanning electron microscopy. This study reveals many interesting features, most prominent among them the possibility to have phase-separated regions of DPPE-nanogold and organic molecules.
ABSTRACT Single-walled carbon nanotubes (SWCNTs) are one of the most interesting alternatives to ... more ABSTRACT Single-walled carbon nanotubes (SWCNTs) are one of the most interesting alternatives to indium tin oxide for the fabrication of transparent conductive films. SWCNT percolating networks have been produced by a variety of different methods, mainly by spraying or filtration of solutions, but, unfortunately, suspending CNTs in liquid requires the use of ultrasound and surfactants. While sonication reduces bundling, it increases the number of defects and also shortens CNTs. Moreover, surfactants are difficult to remove and tend to create an insulating layer between the CNTs and between CNTs and leads. The overall effect is to reduce the global conductivity of the CNT films. It is our opinion that a considerable improvement in film quality can come from a direct synthesis of the network on a flat substrate by chemical vapour deposition (CVD). The networks can then be used on the growth substrate or directly transferred onto a plastic film using techniques that avoid suspension of the CNTs in a liquid. We show here our latest results in controlling the quality of SWCNT percolating network synthesis by alcohol CVD on silicon oxide substrates using cobalt and nickel acetates as precursors, varying catalyst composition, substrate preparation and catalyst pre-treatment.
2006 1st International Conference on Nano-Networks and Workshops, 2006
Silicon technology is rapidly progressing toward device sizes in the range of 10 nm. The evolutio... more Silicon technology is rapidly progressing toward device sizes in the range of 10 nm. The evolution rate of silicon technology in next decades will require the use of new materials and processes to develop revolutionary CMOS devices. Organic nanostructures onto semiconductors or metals may provide interesting solutions to address the technological issues of nanoscale devices. In particular, technologies and devices based on organic nanostructures such as carbon nanotubes, semiconductor or metallic nanoparticles, DNA-templated nanowires may supply solutions for on-chip interconnections. The aim of this work is to present recent results on hybrid nanostructures based on gold nanoparticles stabilized by organic coating. Particular emphasis is devoted to the problem of the interconnections at the nanoscale. The resulting hybrid devices are suitable to develop single electron transistors and memories
The paper addresses the issue of Schottky barrier effects in carbon Nanotube field effect transis... more The paper addresses the issue of Schottky barrier effects in carbon Nanotube field effect transistors and outlines some solutions to tackle such problem. Microfabricated test patterns have been designed to allow the deposition in a controlled way of single wall nanotubes between different couples of source and drain electrodes in a backgate device architecture. Current-voltage characteristics depending on the back
Single-walled carbon nanotubes (SWCNTs) were grown by ethanol chemical vapor deposition (ECVD) an... more Single-walled carbon nanotubes (SWCNTs) were grown by ethanol chemical vapor deposition (ECVD) and growth parameters were optimized using the Taguchi optimization technique. Optimized parameters such as catalyst, spin coating speed, temperature and flow rate of carrier gas are found to be cobalt (Co) and 5% nickel (Ni), 2000 rpm, 900°C, and 100 sccm (argon and 5% hydrogen), respectively. SWCNTs obtained with optimized parameters on SiO (100) substrate show length that ranges form several hundreds of nanometers to a few micrometers and diameters in 1 nm to 3 nm range. Spin coating at 2000 rpm and drying at 8000 rpm are the desired speeds to form the nanosized metal particles for growing small diameter dense network of SWCNTs. Morphological differences between SWCNTs grown with different parameters are studied and discussed by atomic force microscopy and scanning electron microscopy.
Physica E: Low-dimensional Systems and Nanostructures, 2008
Single-wall carbon nanotubes (SWCNTs) are one of the most interesting materials for transparent c... more Single-wall carbon nanotubes (SWCNTs) are one of the most interesting materials for transparent conductive films. In this work, we show our latest results on growth of transparent nanotube networks on quartz and silicon dioxide, and a new process to make a solid-to-...
Physica E: Low-dimensional Systems and Nanostructures, 2007
We report on the identification of efficient combinations of catalyst, carbon feedstock, and temp... more We report on the identification of efficient combinations of catalyst, carbon feedstock, and temperature for the ethanol chemical vapour deposition (CVD) growth of single-wall carbon nanotubes (SWCNTs) onto silicon substrates.Different catalyst preparations, based on organometallic salts (Co, Fe, Mo, Ni acetate, and bimetallic mixtures), have been spin coated onto thermally grown silicon dioxide on silicon chips to perform tests in
ABSTRACT In recent years there have been many improvements in quality and yield of single-walled ... more ABSTRACT In recent years there have been many improvements in quality and yield of single-walled carbon nanotubes (SWCNTs) obtained by chemical vapour deposition (CVD). Mainstream in research is focused on growing thick vertically aligned forests of SWCNTs. At the same time SWCNT films – usually obtained by spraying and filtration – are one of the most promising candidates to replace indium tin oxide (ITO) as transparent electrodes in solar cells and flat displays. The main limit of those techniques is that usually carbon nanotubes (CNTs) are deposited in the form of thick bundles and are mixed with insulating molecules, such as surfactants, used to try to unbundle the CNTs in solution. Moreover, ultrasonication is in general used to help dispersion, inducing defects in the tubes; the overall effect is to considerably reduce the conductivity of such CNT films. It is our firm belief that a considerable improvement in film quality can come by directly synthesizing the networks onto the substrate via CVD, but this requires achieving a control of the density and quality of the SWCNT networks without losing the planar arrangement. We show here our latest results in enhancing the quality of SWCNT percolating network synthesis by alcohol CVD on silicon oxide substrates using cobalt and nickel acetates as precursors.
The functionality, architecture and design of a VLSI array processor for list intersection is pre... more The functionality, architecture and design of a VLSI array processor for list intersection is presented. A NMOS implementation on a 5×5 mm2 chip, with lambda rules using a 2.5 μm line witdth process is considered. The resulting chip, totaling 55,000 transistors, is organized in 16 comparison and 15 supply cells operating cuncurrently. Limits and potentialities of the processor are discussed.
2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe), 2019
The need for low cost power sources was always the scope of researchers, especially for applicati... more The need for low cost power sources was always the scope of researchers, especially for applications such as Wireless sensor networks (WSN), where the maintenance and replacement of energy storage units is costly. In this sense, energy harvesting (EH) is more reliable and cheaper due to its unlimited availability. Though, the environment conditions are usually unpredictable, which requires a specialized circuit to be used with the energy harvesters to ensure the efficient power transfer and to adapt to the variable conditions. The proposed system is a specialized EH circuit for the fluttering wind harvester. It consists of an AC/DC buck-boost converter, controlled by a low power microcontroller which adapts the performance according the variable wind conditions, giving an edge over commercial circuits for the same purpose.
Good driving behavior is a significant factor for road safety and green mobility. A countermeasur... more Good driving behavior is a significant factor for road safety and green mobility. A countermeasure to overcome the coarse driving behavior and a methodology to captivate optimal driving traits are discussed in this work. For which, the serious games concept was exploited to improvise the driver performance by deploying diversified game logics (scores, incentives and live game for performance evolution) on a smartphone-based user interface. The application was tested in ASTA ZERO (Active Safety Test Area) in Sweden. The tests comprised of variations (good and bad driving behavior) in driving pattern for analyzing the impact of the application on the driver performance.
ABSTRACT The ultra-short pulse propagation in Gallium Arsenide (GaAs) structures can be modeled t... more ABSTRACT The ultra-short pulse propagation in Gallium Arsenide (GaAs) structures can be modeled through the Piecewise Linear Recursive Convolution (PLRC) technique in the context of the Finite-Difference Time-Domain (FDTD) solution of Maxwell's equations. Our model is based on a Lorentzian formulation of dispersive media, taking into account the Raman, Kerr and Two-Photon Absorption nonlinearities. Soliton propagation in the presence of nonresonant nonlinear effects with fast time response in semiconductors is investigated.
ABSTRACT A physical system where nanometer sized gold particles are embedded within an ultrathin ... more ABSTRACT A physical system where nanometer sized gold particles are embedded within an ultrathin organic film has been built by exploiting the self-ordering properties of Langmuir-Blodgett films. Dipalmitoyl-Phosphatidyl-Ethanolamine (DPPE) molecules, functionalised with gold atomic clusters, have been mixed in various proportions with cadmium arachidate and alkanes, and hence deposited onto a substrate. The conformational properties of films obtained onto mica and glass substrates have been investigated by means of atomic force microscopy and scanning electron microscopy. This study reveals many interesting features, most prominent among them the possibility to have phase-separated regions of DPPE-nanogold and organic molecules.
ABSTRACT Single-walled carbon nanotubes (SWCNTs) are one of the most interesting alternatives to ... more ABSTRACT Single-walled carbon nanotubes (SWCNTs) are one of the most interesting alternatives to indium tin oxide for the fabrication of transparent conductive films. SWCNT percolating networks have been produced by a variety of different methods, mainly by spraying or filtration of solutions, but, unfortunately, suspending CNTs in liquid requires the use of ultrasound and surfactants. While sonication reduces bundling, it increases the number of defects and also shortens CNTs. Moreover, surfactants are difficult to remove and tend to create an insulating layer between the CNTs and between CNTs and leads. The overall effect is to reduce the global conductivity of the CNT films. It is our opinion that a considerable improvement in film quality can come from a direct synthesis of the network on a flat substrate by chemical vapour deposition (CVD). The networks can then be used on the growth substrate or directly transferred onto a plastic film using techniques that avoid suspension of the CNTs in a liquid. We show here our latest results in controlling the quality of SWCNT percolating network synthesis by alcohol CVD on silicon oxide substrates using cobalt and nickel acetates as precursors, varying catalyst composition, substrate preparation and catalyst pre-treatment.
2006 1st International Conference on Nano-Networks and Workshops, 2006
Silicon technology is rapidly progressing toward device sizes in the range of 10 nm. The evolutio... more Silicon technology is rapidly progressing toward device sizes in the range of 10 nm. The evolution rate of silicon technology in next decades will require the use of new materials and processes to develop revolutionary CMOS devices. Organic nanostructures onto semiconductors or metals may provide interesting solutions to address the technological issues of nanoscale devices. In particular, technologies and devices based on organic nanostructures such as carbon nanotubes, semiconductor or metallic nanoparticles, DNA-templated nanowires may supply solutions for on-chip interconnections. The aim of this work is to present recent results on hybrid nanostructures based on gold nanoparticles stabilized by organic coating. Particular emphasis is devoted to the problem of the interconnections at the nanoscale. The resulting hybrid devices are suitable to develop single electron transistors and memories
The paper addresses the issue of Schottky barrier effects in carbon Nanotube field effect transis... more The paper addresses the issue of Schottky barrier effects in carbon Nanotube field effect transistors and outlines some solutions to tackle such problem. Microfabricated test patterns have been designed to allow the deposition in a controlled way of single wall nanotubes between different couples of source and drain electrodes in a backgate device architecture. Current-voltage characteristics depending on the back
Single-walled carbon nanotubes (SWCNTs) were grown by ethanol chemical vapor deposition (ECVD) an... more Single-walled carbon nanotubes (SWCNTs) were grown by ethanol chemical vapor deposition (ECVD) and growth parameters were optimized using the Taguchi optimization technique. Optimized parameters such as catalyst, spin coating speed, temperature and flow rate of carrier gas are found to be cobalt (Co) and 5% nickel (Ni), 2000 rpm, 900°C, and 100 sccm (argon and 5% hydrogen), respectively. SWCNTs obtained with optimized parameters on SiO (100) substrate show length that ranges form several hundreds of nanometers to a few micrometers and diameters in 1 nm to 3 nm range. Spin coating at 2000 rpm and drying at 8000 rpm are the desired speeds to form the nanosized metal particles for growing small diameter dense network of SWCNTs. Morphological differences between SWCNTs grown with different parameters are studied and discussed by atomic force microscopy and scanning electron microscopy.
Physica E: Low-dimensional Systems and Nanostructures, 2008
Single-wall carbon nanotubes (SWCNTs) are one of the most interesting materials for transparent c... more Single-wall carbon nanotubes (SWCNTs) are one of the most interesting materials for transparent conductive films. In this work, we show our latest results on growth of transparent nanotube networks on quartz and silicon dioxide, and a new process to make a solid-to-...
Physica E: Low-dimensional Systems and Nanostructures, 2007
We report on the identification of efficient combinations of catalyst, carbon feedstock, and temp... more We report on the identification of efficient combinations of catalyst, carbon feedstock, and temperature for the ethanol chemical vapour deposition (CVD) growth of single-wall carbon nanotubes (SWCNTs) onto silicon substrates.Different catalyst preparations, based on organometallic salts (Co, Fe, Mo, Ni acetate, and bimetallic mixtures), have been spin coated onto thermally grown silicon dioxide on silicon chips to perform tests in
ABSTRACT In recent years there have been many improvements in quality and yield of single-walled ... more ABSTRACT In recent years there have been many improvements in quality and yield of single-walled carbon nanotubes (SWCNTs) obtained by chemical vapour deposition (CVD). Mainstream in research is focused on growing thick vertically aligned forests of SWCNTs. At the same time SWCNT films – usually obtained by spraying and filtration – are one of the most promising candidates to replace indium tin oxide (ITO) as transparent electrodes in solar cells and flat displays. The main limit of those techniques is that usually carbon nanotubes (CNTs) are deposited in the form of thick bundles and are mixed with insulating molecules, such as surfactants, used to try to unbundle the CNTs in solution. Moreover, ultrasonication is in general used to help dispersion, inducing defects in the tubes; the overall effect is to considerably reduce the conductivity of such CNT films. It is our firm belief that a considerable improvement in film quality can come by directly synthesizing the networks onto the substrate via CVD, but this requires achieving a control of the density and quality of the SWCNT networks without losing the planar arrangement. We show here our latest results in enhancing the quality of SWCNT percolating network synthesis by alcohol CVD on silicon oxide substrates using cobalt and nickel acetates as precursors.
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Papers by Ermanno Di Zitti