Search results for " Graphene oxide"

showing 10 items of 21 documents

FABBRICAZIONE DI SENSORI ELETTROCHIMICI NANOSTRUTTURATI PER APPLICAZIONI NELL’INDUSTRIA ALIMENTARE E BIOMEDICHE

2023

Settore ING-IND/23 - Chimica Fisica ApplicataAscorbic Acid Uric Acid Sensors Electrochemical Oxidation Reduced Graphene Oxide Gold Nanoparticles Electrochemical Sensors Body Fluids Electrodeposition Glucose Milk Fruit Juice Urine Sweat pH PANI Dopamine
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DOPAMINE ELECTROCHEMICAL SENSOR BASED ON REDUCED GRAPHENE OXIDE AND METAL NANOPARTICLES

2019

Dopamine (DA) is one of the most important neurotransmitters released from the brain, and is involved in many different biological processes. This neurotransmitter influences the processes that involve memory, sleep, mood, learning, and so on. Besides, in the last years, dopamine concentration in human body fluids has been related to some neurodegenerative pathologies, such as Parkinson and Alzheimer’s diseases [1]. It is well known that these pathologies are due to the formation of amyloids plaques that block part of the brain. Many literature data reports that DAergic neurons (areas of midbrain where DA is synthesized) shows a different activity when amyloid plaques are present with a con…

Settore ING-IND/23 - Chimica Fisica ApplicataDOPAMINE ELECTROCHEMICAL SENSOR REDUCED GRAPHENE OXIDE METAL NANOPARTICLES
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Phosphate ions detection by using an electrochemical sensor based on laser-scribed graphene oxide on paper

2023

In this work, electrodes based on laser-scribed reduced graphene oxide were fabricated using filter paper as the substrate. To fabricate the electrodes, a water suspension of graphene oxide was filtered to produce a continuous and uniform film of graphene oxide on the filter paper surface. Subsequently, a CO2 laser was used to "write" the working, counter and reference eelctroes by reducing graphene oxide in specific areas to define complete sensors. Referecnce electrodes were then coated with a commercial Ag/AgCl conductive paste to produce a quasi Ag/AgCl reference. As fabricated devices were employed as electrochemical sensors for detection of phosphate ions in water by employing the mol…

Settore ING-IND/23 - Chimica Fisica ApplicataGeneral Chemical EngineeringSettore ING-IND/17 - Impianti Industriali MeccaniciElectrochemistryPhosphate ions Electrochemical sensor Voltammetry Reduced graphene oxide Paper-based sensors Laser scribedSettore ING-INF/01 - Elettronica
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Nanostructured Lead Electrodes with Reduced Graphene Oxide for High-Performance Lead–Acid Batteries

2022

Nanostructured Pb electrodes consisting of nanowire arrays were obtained by electrodeposition, to be used as negative electrodes for lead–acid batteries. Reduced graphene oxide was added to improve their performances. This was achieved via the electrochemical reduction of graphene oxide directly on the surface of nanowire arrays. The electrodes with and without reduced graphene oxide were tested in a 5 M sulfuric acid solution using a commercial pasted positive plate and an absorbed glass mat separator in a zero-gap configuration. The electrodes were tested in deep cycling conditions with a very low cut-off potential. Charge–discharge tests were performed at 5C. The electrode wi…

Settore ING-IND/23 - Chimica Fisica ApplicataSettore ING-IND/17 - Impianti Industriali MeccaniciElectrochemistrylead–acid batteries; negative electrode; nanostructures; reduced graphene oxide; template electrodeposition; high C-rateEnergy Engineering and Power TechnologyElectrical and Electronic Engineeringlead–acid batteries negative electrode nanostructures reduced graphene oxide template electrodeposition high C-rateBatteries; Volume 8; Issue 11; Pages: 211
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Photothermal nanofibrillar membrane based on hyaluronic acid and graphene oxide to treat Staphylococcus aureus and Pseudomonas aeruginosa infected wo…

2022

Here we reported the fabrication of an electrospun membrane based on a hyaluronic acid derivative (HA-EDA) to be used as a bandage for the potential treatment of chronic wounds. The membrane, loaded with graphene oxide (GO) and ciprofloxacin, showed photothermal properties and light-triggered drug release when irradiated with a near-infrared (NIR) laser beam. Free amino groups of HA-EDA derivative allowed autocrosslinking of the elec- trospun membrane; thus, a substantial enhancement in the hydrolytic resistance of the patch was obtained. In vitro antibacterial activity studies performed on Staphylococcus aureus and Pseudomonas aeruginosa revealed that such electrospun membranes, due to the…

Staphylococcus aureusGeneral MedicineStaphylococcal InfectionsBiochemistryHyaluronan derivative Graphene oxide Nanofibers AntibiofilmAnti-Bacterial AgentsStructural BiologySettore CHIM/09 - Farmaceutico Tecnologico ApplicativoPseudomonas aeruginosaWound InfectionHumansGraphiteHyaluronic AcidMolecular BiologyInternational journal of biological macromolecules
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FLEXIBLE ELECTRODE BASED ON GOLD NANOPARTICLES AND REDUCED GRAPHENE OXIDE FOR URIC ACID DETECTION USING LINEAR SWEEP VOLTAMMETRY

2021

In this work, an electrochemical sensor for uric acid determination is shown with a preliminary study for its validation in real samples (milk and urine). Uric acid can be electrochemically oxidized in aqueous solutions and thus it is possible to obtain electrochemical sensors for this chemical by means of this electrooxidation reaction. Indium tin oxide coated on flexible polyethylene terephthalate substrate, modified with reduced graphene oxide and gold nanoparticles by co-electrodeposition, was used. Electrodeposition was performed at -0.8V vs SCE for 200 s. All samples were characterized by electron scan microscopy and electron diffraction spectroscopy. A careful investigation on the ef…

TK7885-7895Computer engineering. Computer hardwareMilkChemical engineeringSettore ING-IND/23 - Chimica Fisica ApplicataElectrochemical sensorTP155-156UrineUric acidUric acid Electrochemical sensors Reduced graphene oxide Gold nanoparticles Milk Urine
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Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

2014

The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions covalent attachment etc.) [1]. Furthermore since the GO is biocompatible and noncytotoxic many studies have been recently focused on the development of GO-based nanodevices for bioimaging DNA detection drug delivery. Due to their low cytotoxicity and large internal surface area silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [12]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS FTIR Raman analysis UV photoluminescence analysis TGA Zeta potential measurements electrical tests AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica.
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PREPARATION OF MULTIFUNCTIONAL NANO-STRUCTURED POLYMER NANOHYBRIDS CONTAINING CARBON COMPOUNDS

nanocomposites polyamide graphene oxide
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Photocatalytic H2 evolution from aqueous solutions of oxygenated organic compounds in the presence of C3N4/reduced graphene oxide based photocatalysts

2022

Composites of C3N4/reduced graphene oxide have been used as a cheap and promising photocatalysts for triethanolamine and ethanol photo-reforming with H2 generation in aqueous solution. The rate of H2 production over the best performing photocatalysts reached 1,415 μmol·h-1·g-1 which increases up to 57,306 in the presence of 1% of Pt. The apparent quantum efficiency of the optimal material was 7 % by using both LED and natural sunlight irradiation

photoreformingH2 generationphotocatalysisreduced graphene oxideC3N4
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Sensors for the monitoring of analytes in the sweat

In the last decade, can be found an exceptional growth in research activity relating to the development of wearable devices, capable of continuously monitoring the health conditions of the wearer by analyzing body fluids such as blood, urine, saliva, tears and sweat. Among the body fluids available, sweat is a biofluid of particular interest, as it allows a non-invasive, continuous and comfortable collection. Human sweat contains useful information on the health of an individual and therefore is an excellent biofluid for the detection of specific analytes. The most abundant ions in the sweat are Na+ and Cl- (10 - 100 mM), and their monitoring is useful in patients with cystic fibrosis. Othe…

sweatelectrochemical sensorpH sensorwearable sensorreduced graphene oxidepolyaniline
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