Developing a screen-printed graphite–polyurethane
· A screen-printed electrode (SPGPUE) was prepared with graphite–polyurethane composite ink containing gold nanoparticles (AuNPs) resulting in a screen-printed graphite–polyurethane composite electrode modified with gold nanoparticles (SPGPUE–AuNPs). Gold nanoparticles were prepared by the citrate method and extract
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Voltammetric determination of cysteine at a graphite
· The electrochemical behaviour of cysteine (Cys) at a graphite electrode modified with gold nanoparticles (G-Aunano electrode) was studied by cyclic voltammetry. It was found that the graphite electrode-Au nanoparticles show an electrocatalytic activity towards the oxidation of Cys in 0.1 M NaOH. At 0.05 V there is an "inverse" maximum in the cathodic voltammogram of Cys. Using a G-Aunano
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A Gold Nanoparticle-Modified Carbon Paste Electrode as
· graphite powder with approximately 0.2 ml of paraffin oil. The colloidal gold nanoparticles modified carbon paste electrode (GN-CPE) was prepared by thoroughly mixing 0.50 g graphite powder and 1.5 ml of colloidal gold nanoparticles solution prior to
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Reduced Graphene Oxide/Gold Nanoparticles Modified
· On top of that the electrochemical behaviour of the composite-modified electrode improved highest compared with a single ingredient modified electrode (rGO-modified SPCE or AuNP-modified SPCE) due to the synergic effect of both graphene and gold nanoparticles which showed a good electrical conductivity and large electroactive surface area . It
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USA1Pencil graphite electrode modified with
The pencil graphite electrode modified with gold nanoparticles can be used for the detection of hydrazine. The pencil graphite electrode has an outer surface coated with gold nanoparticles. Prior
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Enzyme Immobilization on Gold Nanoparticles for
· The Au/SLG/GCE (gold nanoparticles on a single-layer graphene glass carbon electrode) was a platform for GOD (glucose oxidase) immobilization using covalently bound –SH groups with gold (Figure 3 b) . The gold nanoparticles were used to join the 6-(ferrocenyl)hexanethiol and the 6-amino-1-hexanethiol hydrochloride with the electrode by
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Voltammetric determination of nitrite with gold
· The working electrode (PGE) was functionalized by electropolymerization of methylene blue () and modified with gold nanoparticles (GNPs) to produce the final (GNP/PMB/PGE) electrode in a two-step procedure.
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Electrochemical activity of glutathione at a graphite
The electrochemical activity of the glutathione (GSH) at the graphite electrodes modified with gold nanoparticles (AuNP-GCE) is formed under the ratio of reactants and in solutions of supporting electrolytes of 0 1 M NaOH 0 1 "phosphate buffer (pH 6.86) 0 1 M HCl 0 1 M NaClO 4 is studied by the method of cyclic voltammetry. The dependence of the electrochemical activity of GSH on ratio of
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A Reduced Graphene Oxide/Gold Nanoparticles
· A Reduced Graphene Oxide/Gold Nanoparticles Composite Modified Glassy Carbon Electrode as Electrochemical Sensor for Calcium Ions Detection in Bottled Water Nawal 1A. Alarfaj1 2Maha F. El-Tohamy † Hesham F.Oraby 1 Department of Chemistry College of Science King Saud University P.O. Box 22452 Riyadh 11495 Saudi Arabia
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Development of a high analytical performance-tyrosinase
· Preparation of tyrosinase–colloidal gold–graphite–Teflon biosensorsColloidal gold was prepared according to the procedure described earlier (Mena et al. 2005) by adding 2.5 ml of sodium citrate solution to 100 ml of a boiling aqueous solution containing 1 ml 1 (w/w) HAuCl 4. The diameter of colloidal gold nanoparticles was 16 ± 2 nm
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Simple and signal-off electrochemiluminescence
· A simple signal-off electrochemiluminescence (ECL) immunosensor for sensitive and selective detection of alpha fetoprotein (AFP) was developed based on gold nanoparticle (AuNPs) modified graphite-like carbon nitride nanosheet (g-C 3 N 4 NSs) nanohybrids (Au-g-C 3 N 4 NHs). Compared to the g-C 3 N 4 NS modified glassy carbon electrode (GCE) the ECL intensity is more
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A cysteine sensor based on a gold nanoparticle–iron
An electrochemical sensor for the sensitive and selective detection of cysteine is proposed based on a gold nanoparticle (AuNP)–iron(III) phthalocyanine (FePc) modified graphite paste electrode.The sensor was characterised using scanning electron microscopy (SEM/EDX) transmission electron microscopy (TEM) cyclic voltammetry and electrochemical impedance spectroscopy (EIS).
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Electrochemical Determination of Paracetamol Using Gold
· 2.1.1. Construction of gold nanoparticles modified CP-electrode (GNMCPE) CP-electrode was fabricated as described elsewhere 35 then was immersed into 6 mM hydrogen-tetrachloroaurate HAuCl 4 solution containing 0.1 mol L −1 KNO 3 (prepared in doubly distilled water and deaerated by bubbling with nitrogen).
Get PriceGold nanoparticles modified exfoliated graphite electrode
· (2020). Gold nanoparticles modified exfoliated graphite electrode as electrochemical sensor in the determination of psychoactive drug. Journal of Environmental Science and Health Part B Vol. 55 No. 5 pp. .
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Electrochemistry of glucose at gold nanoparticles modified
· An enzyme-free voltammetric glucose sensor based on gold nanoparticles modified graphite/SrPdO 3 electrode is presented. The proposed glucose sensor showed prominent electrocatalytic activity toward the glucose oxidation in 0.1 mol L −1 NaOH.
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Developing a screen-printed graphite–polyurethane
· A screen-printed electrode (SPGPUE) was prepared with graphite–polyurethane composite ink containing gold nanoparticles (AuNPs) resulting in a screen-printed graphite–polyurethane composite electrode modified with gold nanoparticles (SPGPUE–AuNPs). Gold nanoparticles were prepared by the citrate method and extract
Get PriceGold Electrodes Modified with Self-Assembled Layers Made
Gold electrodes modified with S-containing compounds and gold nanoparticles were used for determination of epinephrine (EP) in aqueous solution. The modified electrodes exhibited a good sensitivity reproducibility and stability. The results have shown that modified electrodes could clearly resolve the oxidation peaks of epinephrine ascorbic acid (AA) and uric acid (UA) with peak-to-peak
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Development of a high analytical performance-tyrosinase
The design of a new tyrosinase biosensor with improved stability and sensitivity is reported. The biosensor design is based on the construction of a graphite-Teflon composite electrode matrix in which the enzyme and colloidal gold nanoparticles are incorporated by simple physical inclusion. Experime
Get PriceModification of screen-printed gold electrode with 1 4
In this study a screen-printed gold electrode (SPGE) was modified with 1 4-dithiothreitol by SAMs. Different electrochemical methods such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used for the characterization of modified electrode.
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Electrochemical activity of glutathione at a graphite
The time modifying the graphite electrode by gold nanoparticles was experimentally determined and is equal to 90 s. The electrochemical activity of GSH at the graphite electrode modified with gold nanoparticle in the solution of some supporting electrolytes
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Developing a screen-printed graphite–polyurethane
Developing a screen-printed graphite–polyurethane composite electrode modified with gold nanoparticles for the voltammetric determination of dopamine Priscila Cervini Isabela A. Mattioli and Éder T. G. Cavalheiro Instituto de Química de São Carlos Universidade de São Paulo Av. Trabalhador São-carlense 400 CEP São
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Gold Electrodes Modified with Self-Assembled Layers Made
Gold electrodes modified with S-containing compounds and gold nanoparticles were used for determination of epinephrine (EP) in aqueous solution. The modified electrodes exhibited a good sensitivity reproducibility and stability. The results have shown that modified electrodes could clearly resolve the oxidation peaks of epinephrine ascorbic acid (AA) and uric acid (UA) with peak-to-peak
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Electrochemical Activity of Glutathione at a Graphite
· Electrochemical Activity of Glutathione at a Graphite Electrode Modified with Gold Nanoparticles D.O.PEREVEZENTSEVA 1 K.V. SKIRDIN1 E.V. GORCHAKOV2 and V.I. BIMATOV3 1Tomsk Polytechnic University 30 Lenin Street Tomsk Russia 634050 2Stavropol State Agrarian University 12 Zootechnical Street Stavropol Russia 355017
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Graphite/gold nanoparticles electrode for direct protein
· In this work graphite/gold nanoparticles were chemically synthesized through immersion of graphite electrode in boiling HAuCl 4.3H 2 O solution without any further procedure. The SEM images showed that Au NPs were uniformly dispersed on the surface of the graphite electrode and the modified electrode is very suitable for protein attachment
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Simultaneous electrochemical determination of dopamine
· Simultaneous electrochemical determination of dopamine and 5-hydroxyindoleacetic acid in urine using a screen-printed graphite electrode modified with gold nanoparticles. Prosper Kanyong School of Engineering Ulster University Jordanstown BT37 0QB Northern Ireland.
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Electrochemical investigation of a graphite-polyurethane
· Gold nanoparticles (AuNP) were electrodeposited onto the surface of a graphite-polyurethane composite electrode (EGPU) followed by electrochemical treatment in NaOH medium using cyclic voltammetry. After characterization and optimization of the experimental conditions the resulting device (EGPU-tAuNP) was used for voltammetric determination of tryptophan (TRP).
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Electrochemical Genosensor Based on Colloidal Gold
· Electrochemical genosensors for the detection of the Factor V Leiden mutation from polymerase chain reaction (PCR) amplicons using the oxidation signal of colloidal gold (Au) is described. A pencil graphite electrode (PGE) modified with target DNA when hybridized with complementary probes conjugated to Au nanoparticles responded with the appearance of a Au oxide wave at ∼ 1.20 V.
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Reduced Graphene Oxide/Gold Nanoparticles Modified
· On top of that the electrochemical behaviour of the composite-modified electrode improved highest compared with a single ingredient modified electrode (rGO-modified SPCE or AuNP-modified SPCE) due to the synergic effect of both graphene and gold nanoparticles which showed a good electrical conductivity and large electroactive surface area . It
Get PriceElectrochemical Determination of Paracetamol Using Gold
· 2.1.1. Construction of gold nanoparticles modified CP-electrode (GNMCPE) CP-electrode was fabricated as described elsewhere 35 then was immersed into 6 mM hydrogen-tetrachloroaurate HAuCl 4 solution containing 0.1 mol L −1 KNO 3 (prepared in doubly distilled water and deaerated by bubbling with nitrogen).
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Electrochemical properties of enzyme electrode covalently
· Preparation of graphite-oxide/cobalt-hydroxide nanoparticles with electron-transfer mediator Graphite oxide (GO) was prepared on a modified Hummer s method 29 . Briefly graphite (4 g) was reacted with KMnO 4 (24 g) in an H 2 SO 4 /H 3 PO 4 solution mixture (volume ratio of 9 1).
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