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Showing 1 to 20 of 34 for “"Modified Electrode"”.
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A Polypyrrole/Sulfonated Calixarene Modified Electrode for the Electochemical Detection of Dopamine
… (C4S) doped polypyrrole (PPy-C4S)modified electrode for the electrochemical detection ofdopamine (DA) is reported. the physical and electrochemical characteristics of the PPy-C4S film are discussed, the oxidation of DA and the PPy-C4S modified electrode is investigated and the mode …
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Studies of the Structure and Electrocatalytic Reduction of Oxygen on Modified Electrode Surfaces
Finally, the mechanism of the electroreduction of oxygen on Au surfaces in basic media is examined using SERS and density functional theory calculations. The spectroscopy reveals superoxide species as a reduction intermediate, while no peroxide is detected. The spectroscopy also shows the presence …
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I. Luminescence Spectroelectrochemistry in Thin Layer Cells. Ii. Kinetics of Mediated Oxidation at a Polymer Modified Electrode
… emitted from an optically transparent thin layer electrode, was monitored as a function of potential. As in the absorbance mode experiment, analysis of the data via Nernst plots proved to be an excellent means of determining n and E('o)', despite the intrusion of photochemical processes in the …
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DEVELOPMENT AND INVESTIGATION OF THE PROPERTIES OF AN ELECTROCHEMICALLY REGENERABLE CHEMICALLY MODIFIED ELECTRODE FOR CHEMELUMINESCENCE DETECTION OF ANALYTES IN SOLUTION
… by producing electrochemically regenerable electrodes modified with a polymer derivative of this complex. Ruthenium tris(4-meth}i-4' -vinyl-2,2' -bipyridine) bis(hexafluorophosphate) was synthesised and subsequently polymerised onto an electrode surface using the technique of cyclic …
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Electrochemical determination of gallic acid in food matrices using novel materials.
… pulse voltammetry (DPV) at inert glassy carbon electrode (GCE) or carbon paste electrodes (CPE) have also been used in the determination of GA. However, despite their easy application and fast result generation, their sensitivity and selectivity have been relatively inadequate for the analysis …
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Multimaterial Fibers for Biosensing Application Using Electrochemistry
… sensing, and this method involves the use of electrodes as its sensing component. Multimaterial electrode-embedded fibers are used as the sensing electrode and the electrode material presented is platinum (Pt). Platinum is employed because of its biocompatibility property. The electrodes are …
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The Formation of an Electrochemical Sensor for the Selective Detection of Dopamine
… in comparison to the several other polypyrrole modified electrodes that were investigated in this study and it was also highly selective towards DA in the presence of a wide variety of major interfering compounds. The sulfonated β-cyclodextrins were immobilised in a polypyrrole film via a …
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Water Management in the PEM Fuel Cell by Incorporating a Novel Siloxane Polymer in the Electrode Layer
… employing a hydrophilic substance COMP-1 in the electrode layer. This modified electrode was hypothesized to prevent the cell from dehydrating by retaining water in the catalyst layer. The improvement would accelerate PEM fuel cell technology to be commercialized in the automotive sector. Through …
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The Electrochemical Characterisation of Carbon-based Nanomaterials and their Application in the Detection of Heavy Metal Ions
… were constructed using pencil style electrodes which were modified via drop-casting. Both carbon nanomaterials were used in their pristine form, simply cast from a DMF suspension. It was found that the electrode modified with sonicated MWCNTs possessed a greater electroactive surface …
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Fabrication of Chemically Modified Nanometer-sized Gold Electrodes and Their Application in Electrocatalysis at Pt Nanoparticles.
… at a high rate at the surface of Pt than at Au electrodes. Using cyclic voltammetry, chemically modified nanometer-sized Au electrodes, prepared by the Laser-Assisted Puller Method, were employed to examine current amplification by electrocalysis at Pt nanoparticles adsorbed on the modified Au …
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Glucose Biosensor Using Electrospun Mn2O3-Ag Nanofibers
… of direct electron transfer between GOD and the electrode is observed at the Mn<sub>2</sub>O<sub>3</sub>-Ag-GOD modified electrode with a fast electron transfer rate constant. The biosensor also shows fast response to glucose, high sensitivity (40.60 μA×mM<sup>-1</sup>×cm<sup>-2</sup>), low …
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Characterization of polymer-modified electrodes from transient ultramicroelectrode experiments
… chronoamperometric transients of an ultramicroelectrode to the split function derived by Aoki and Osteryoung. An extensive investigation into the effect of noisy data and small bias currents on the diffusion coefficients and concentrations obtained by this analysis is also presented. The …
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Aminoxyl Catalyzed Electrochemical Ethanol Detection: Development of a New Breathalyzer Using Molecular Catalysis
… sensing element consists of a screen-printed electrode in which the graphene oxide-based working electrode is modified with aminoxyl derivatives, of which 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl benzoate (TMB) was the most efficient derivative. Exposing this modified electrode to …
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Otimização de um eletrodo de carbono vítreo modificado com nanotubos de carbono para detecção voltamétrica do fungicida carbendazim.
For many years the mercury electrode has been widely used as working electrode in electrochemical analysis. However, new electrode materials, such as the glassy carbon, carbon paste, platinum, gold, among others, are excellent alternatives to the mercury electrode because of the ease of …
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Spray coated bentonite/MWCNT composite enzymatic biosensor for uric acid detection
… Uricase (UOX) was immobilized on the BT/MWCNTs modified electrode using glutaraldehyde (GA) crosslinking, forming a stable enzyme matrix with strong adhesion and reduced leaching. The fabricated BT/MWCNT/GA/UOX biosensor was systematically characterized through morphological, chemical, and …
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Investigation of structure and permeability of surfaces modified with self-assembled monolayers
This research focuses on how the structure of modified interfaces influence the behavior of the interface. Two groups of dialkyl sulfides are prepared and studied: a purely hydrocarbon dialkyl sulfide with the structure CH₃(CH₂)₁₇S(CH₂)<sub>n</sub>CH₃, where n=7, 9, and 17, and a carboxylic acid …
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Photoelectrochemical imaging of gold nanoparticles by light-activated electrochemistry
… (LAE) on Si was developed as a single-wire electrode array where a light pointer created localized conductive channels on a monolithic monolayer-terminated Si electrode and allowed undertaking spatially-resolved faradaic electrochemistry on the surface of Si electrode at desired locations. …
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Green Carbon Quantum Dots Based Electrochemical Sensors for Analysis of Neurotransmitters
… prior to the modification of a glassy carbon electrode for neurotransmitters detection (dopamine (DA), epinephrine (EP), and norepinephrine (NE)). The two carbon-based quantum dots were prepared from pencil graphite and banana peel precursors and tagged CQDs and bCQDs, respectively. The …
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Advanced Electrochemical Analysis for Complex Electrode Applications
… they include the formation of polymer films on electrode surfaces during measurements, a novel nanocatalyst modified electrode surfaces, and organised carbon nanotube (CNT) structures on electrode surfaces. These have been utilised for different electrochemical applications owing to their …
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