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Energy

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The invention relates to a method to produce chemically enhanced polyaniline / reduced graphene oxide nanocompisites starting from a previous patented material is developed. The produced nanocomposite is readily dispersible in some organic solvents and it can be used as ink. This ink can be easily processed by the inkjet direct printing technique and produce devices on flexible substrates. The devices has resonance frequency that can be tuned simply by the number of printing passes thanks to electronic resonance with extremely long transfer rates between reduced graphene oxide and polyaniline. This resonance introduces a discontinuity in the capacitance producing asymptotic divergences to infinity having sign dependent on the frequency sweep direction. Hence devices may be geometrically tuned to operate with desired capacitance (either positive or negative) at the desired frequency

   

The invention relates to a method for the preparation of polyaniline/reduced graphene oxide composites comprising the steps of: dispersing the graphene oxide in an acid aqueous solution containing an anionic emulsifying agent to obtain a graphene oxide dispersion; dissolving one or more oligomers of the aniline,optionally substituted, in an organic solvent to obtain an oligomer solution; mixing said oligomer solution with said dispersion of graphene oxide to obtain a polyaniline/reduced graphene oxide composite.

   

A cost‐effective three‐dimensional soft material composed of at least one conductive material, one non‐conductive material and air gap between them for energy harvesting and sensing purposes, based on the triboelectric and electrostatic effects.

   

Photo-detector device including an active layer adapted to absorb an optical radiation and to generate in a corresponding way pairs of electrical charge carriers, comprised between a first and a second electrode layer including a respective electrically conductive material, at least one of which is a layer of optically transparent material, arranged to be connected to an external electrical signal processing circuit, characterized in that the said active layer includes a self-assembling monolayer of molecules comprising a donor group facing the first electrode layer and an acceptor group facing the second electrode layer, the said molecules being adapted to assume a charge transfer state resulting from the absorption of the optical radiation whereby the charge carriers generated reside separately on the donor group and on the acceptor group and are transferred therefrom to the adjacent electrode layers, in such a manner as to determine a flow of a detection electrical current in the signal processing circuit.

   

Photo-detector device including an active layer adapted to absorb an optical radiation and to generate in a corresponding way pairs of electrical charge carriers, comprised between a first and a second electrode layer including a respective electrically conductive material, at least one of which is a layer of optically transparent material, arranged to be connected to an external electrical signal processing circuit, characterized in that the said active layer includes a self-assembling monolayer of molecules comprising a donor group facing the first electrode layer and an acceptor group facing the second electrode layer, the said molecules being adapted to assume a charge transfer state resulting from the absorption of the optical radiation whereby the charge carriers generated reside separately on the donor group and on the acceptor group and are transferred therefrom to the adjacent electrode layers, in such a manner as to determine a flow of a detection electrical current in the signal processing circuit.

   

The disclosed nanocrystals can be used as a cathode in Li-ion battery.Lithium Iron Phosphate nanocrystals are synthesized by a colloidal method; this synthesis permits to control very efficiently the shape and the size of the crystals. The size of the nanoparticles is below 100 nm. The process of lithiation and de-lithiation could be easier respect to the past due to the small size of the crystals that lead to high surface/volume ratio. LiFePO4 is not a conductive material and it needs a carbon coating. Working with LiFePO4 NCs this step is no more necessary because the electrical conductivity is increased in the nanosized material.

   

The invention refer to an optoelectronic device that can act at the same time as a photovoltaic device, by producing energy by using solar radiation, and as a photochromic disposable, varying color and transparency in response to a luminous and/or electric stimulus.

   

Energy harvesting is a focal point for autonomous robots. For this reason the department of Advanced Robotics have developed a revolutionary microturbine, able to harvest energy exploiting airflow to produce electric energy. The innovative design uses a reduced number of parts, coupling the turbine and generator into a single component. The hi-tech design microturbine gives unmatched performance in terms of power vs. airflow, reaching regimes in the order of ten-thousand rpm.

   

The present invention relates to a method for patterning of colloidal nanocrystals films that combines a high energy beam treatment with a step of cation exchange. The high energy irradiation causes cross-linking of the ligand molecules present at the nanocrystal surface, and the cross-linked molecules act as a mask for the subsequent cation exchange reaction. Consequently, in the following step of cation exchange, the regions that have not been exposed to beam irradiation are chemically transformed, while the exposed ones remain unchanged. This selective protection allows the design of patterns that are formed by chemically different nanocrystals, yet in a homogeneous nanocrystal film.

   

The invention consists of a voltage converter architecture allowing the powering of electronic circuits through photovoltaic devices together with batteries. The invention allows extracting power from the photovoltaic device even in such conditions, making possible for the photovoltaic device to partially contribute to the powering of the load and consequently reducing the energy drained by the battery.

   

The invention relates to a system constituting an active glowing label that is compatible with recycling, can be printed with high-throughput printing processes either on plastic or paper labels or directly on plastic containers (e.g. PET), is compatible with current packaging industry standards and integrates a suitable energy source, enabling energy independence.

Ultimo aggiornamento Lunedì 25 Gennaio 2016

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