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Modified electrode

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Metal nanoparticles/carbon nanotube modified electrodes for voltammetric determination of boron

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The almost semicircle corresponds to the charge transfer process at high frequencies, whereas linear portions correspond to the diffusion process at low frequencies for GCE and modified electrodes. The diameter of the semicircle shows the magnitude of electron-transfer resistance at the electrode surface.

Sensitive determination of hydrazine using poly(phenolphthalein), Au nanoparticles and multiwalled carbon nanotubes modified glassy carbon electrode

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Recovery analysis of hydrazine determination in Karaçay and Gediz Rivers samples at the modified electrode (n = 3).. doi: 10.1016/j.snb . Gold nanoparticle-modified graphite pencil electrode for the high-sensitivity detection of hydrazine. doi: 10.1016/j.talanta . Nanomolar determination of hydrazine by TiO 2 nanoparticles modified carbon paste electrode. doi: 10.1007/s . Long-term inhalation toxicity of hydrazine.

Voltammetric determination of itopride using carbon paste electrode modified with Gd doped TiO2 nanotubes

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Voltammetric determination of itopride using carbon paste electrode modified with Gd doped TiO 2 nanotubes. Carbon paste electrode has been fabricated and mixed with Gd doped and undoped TNT to form a nanocomposite working electrode. Comparison of bare carbon paste electrode and Gd doped and undoped TNT carbon paste electrode for M K 4 [Fe(CN) 6 ] voltammetric analysis. Gd doped TNT modified electrode has been used as working electrode for itopride assay in a pharmaceutical formulation.

Amperometric urea biosensor based on immobilized urease on polypyrrole and macroporous polypyrrole modified Pt electrode

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Therefore, this modified electrode is better in clinical applications than the Pt/PPy/GA-Urs electrode.

An ultrasensitive electrochemical immunosensor platform based on disposable ITO electrode modified by 3-CPTMS for early detection of parathyroid hormone

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The silane agent allows the formation of func- tional groups such as -COOH, -NH 2 , -SH, and -CN, which play roles in the attachment of the biodegradation element to the hydroxylated electrode surface. Nyquist graphs represent the EIS spectra of different layers of the modified electrode.. The diameter of the semicircle is used to calculate the Rct on the electrode surface. The detection range of the designed biosensor was 0.001–10 ng/mL and the detection limit was 10 pg/mL [19].

Electrochemical determination of Sudan IV in food samples by using graphene-modified glassy carbon electrodes

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Sudan IV Nanotube modified electrode Sudan IV HPLC-DAD . Sudan IV Graphene-modified electrode This work. Under the optimized conditions, the prepared test solution was detected at the graphene-modified GCE by CV. Fortunately, no observable peaks appeared and a recovery experiment was carried out by adding a known amount of Sudan IV to the sample. Recovery of determination of Sudan IV in samples (n = 6).. Content in samples Sudan IV added (M) Average found (M) Recovery.

Voltammetric determination of vanillin in commercial food products using overoxidized poly(pyrrole) film-modified glassy carbon electrodes

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The long-term stability of the modified electrode was investigated by examining the peak current response of mol L − 1 VAN, and the modified electrode was stored in 0.1 mol L − 1 at pH 5.2 buffer solution at room temperature during the stability measurements. The current response of the electrode for VAN retained about 97.2% of its initial current after 20 days, which shows that the stability of the modified electrode is good enough for use in long-life voltammetric sensors..

Enhanced electrocatalytic activity of copper phthalocyanine/multiwalled carbon nanotube composite electrode via Pt nanoparticle modification for oxygen reduction

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This relationship was correlated with the characteristics of the diffusion-controlled process at the electrode surface.. Stability of PtNPs/CuPc-CNT film on electrode surface. The stability of the PtNPs/CuPc-CNT film modified electrode was studied by CV measurements. no remarkable change was observed in the current response of the modified electrode stored in the vapor of 0.1 M NaOH solution for 30 days.

Electrochemical monitoring of the interaction between mitomycin C and DNA at chitosan–carbon nanotube composite modified electrodes

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Disposable chitosan*CNT-PGEs have also presented many advantages, being easy to use, sensitive, cost effective, and with good repeatability in comparison to other conventional electrodes, e.g., carbon paste electrode, glassy carbon electrode, and gold electrode.. (A) Nyquist diagrams recorded at bare PGE (a), chitosan modified PGE (b), chitosan and CNT modified PGE (c), and 50 µ g/mL dsDNA immobilized chitosan*CNT PGEs before (d) and after (e) interaction with 40 µ g/mL MC.

Chemical engineering Doctoral dissertation: Synthesis of catalysts based on Pt/SBA-15 modified with Al and/or B and their applicability on n-heptane hydroisomerization, tetralin hydrogenation and paracetamol detection

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Electrochemical characterization of 1%Pt/Al-SBA-15-GPE electrode material. V for Pt/Al- SBA-15-GPE and V for GPE, respectively. The electrochemical parameters of the 1%Pt/Al-SBA-15-GPE electrode material.. 1%Pt/Al-SBA-15-GPE . SBA-15-GPE. Pt/Al-SBA-15-GPE . Electrochemical impedance spectroscopy measurements at 1%Pt/Al-SBA-15-GPE electrode. Nyquist plots recorded at 1%Pt/Al-SBA-15-GPE modified electrode. EIS fitting parameters for Pt/Al-SBA-15-GPE modified electrodes..

Application of a pencil graphite electrode for voltammetric simultaneous determination of ascorbic acid, norepinephrine, and uric acid in real samples

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In the previous studies, the methods suggested for the simultaneous determination of these compounds were carried out using the modified electrode. However, the electrodes used in these methods were expensive, the modification procedure and the polishing and cleaning steps before modification were time-consuming, and not every modified electrode was prepared in the same manner, which affected the reproducibility of the results, making these methods disadvantageous.

Determination of hydrogen peroxide with an enzymeless amperometric sensor based on poly(vinylferrocene)-supported Ag nanoparticles

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Current–time responses of Ag/PVF-modified Au electrode exposed to UA, AA, DA, and Glu (0.5 mM each) in the presence of 0.5 mM H 2 O 2 at an applied potential of –0.5 V versus SCE.. Reproducibility of Ag/PVF-modified Au electrode studied for 10 days.. A modified electrode system was developed based on Ag nanoparticles supported on conducting PVF film.

The mediatory activity of meso-tetraphenylporphyrin iron(III) complex immobilized in Nafion film on a Pt electrode in the oxidation of 1,2- and 1,4-hydroquinones

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Key words: meso -Tetraphenylporphyrin iron(III) complex, nafion, hydroquinones, chemically modified electrode, redox mediator. 7 Regarding this immobilization of the electrocatalysts into the electrode, an ion-exchange polymer matrix could solve this problem. One of the best solutions to this case might be a platinum electrode coated with Nafion film that contains the immobilized catalyst.

Fabrication of layer-by-layer deposited films containing carbon nanotubes and poly(malachite green) as a sensor for simultaneous determination of ascorbic acid, epinephrine, and uric acid

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Figure 3 shows the possible mechanism for the immobilization of PMG at the surface of the modified electrode. Schematic representation of the proposed mechanism for electrodeposition of PMG at the surface of the modified electrode.. exhibited a high stability in the anodic peak current whenever it was placed under ambient conditions in dry state or in phosphate buffer (pH 7.0) for 1 month or longer, showing a good stability of the modified electrode..

Fabrication and characterization of enhanced hydrazine electrochemical sensor based on gold nanoparticles decorated on the vanadium oxide, ruthenium oxide nanomaterials, and carbon nanotubes composites

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The surface of the glassy carbon electrode was polished on the cloth with 0.1 µm Al 2 0 3 slurry. Scheme shows the mechanism of hydrazine at proposed electrode.. SEM and HRTEM were used for the characterization of the size and morphology of modified electrodes. Electrocatalytic mechanism of the oxidation of hydrazine at AuNPs/(VOx-RuOx)/CNT/GCE..

Preparation of a lead sensor based on porous multiwalled carbon nanotubes/thiolated chitosan composite materials

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Then 10 µL of the prepared composite–acetic acid solution was deposited directly onto the ITO electrode. The electrode was then quickly transferred to a vacuum freeze-dryer, and frozen at –20 ◦ C for 3 h, forming the modified electrode.. Before each test, the modified electrode was immersed into the solution for adsorption under stirring.

Synthesis of neodymium-iron nanoperovskite for sensing applications of an antiallergic drug

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The response of the modified electrode NFMCpE-SDS was examined in 0.5 mmol L − 1 ketotifen/0.1 mol L − 1 PBS of different pH values from 2 to 11 (data not shown). DPV results, the pH value of the solution displayed a great impact on the anodic peak potential and the anodic peak current of ketotifen at the surface of the modified electrode.

Effect of additives in compressed lead–acid batteries

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Finally, two polycarbonate wedges are set out parallel to the electrode stack and the pressure is applied on the dry cells thanks to the use of calibrated springs (Fig. The modified electrode preparation consists of the addi- tion of 1–2 wt.% of additives into the original paste formula- tion. The cells are composed of the assembly of three plates in which the modified one is surrounded by the two other polarities and the multi-layer separator is inserted between the plates.

Nghiên cứu tính chất của các chất lỏng Ion và ứng dụng trong phân tích điện hóa

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Zhuangying, P., et al.(2009), Preparation of Hydroxyapatite/Ionic Liquid Composite Film Modified Electrode and Its Application to the Highly Selective Determination of Trace Cadmium in Water

Differential pulse voltammetric determination of dopamine using Pd nanoparticles deposited on (3-aminopropyl)triethoxysilane functionalized CeO2 nanoparticles

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DPVs obtained at Nf/Pd@CeO2- APTES/GCE working electrode with various concentra- tions of DA. Inset: oxidation peak current of DA versus concentration of DA.. DPVs response of Nf/Pd@CeO 2 -APTES/GCE to and 130 µ M of DA in the presence of and 130 µ M of AA, UA, Glu, and FA.. To investigate the repeatability of Nf/Pd@CeO 2 -APTES/GCE working electrode, five different DPVs were obtained in 0.1 M PBS (pH 7) containing 40 µM DA using the same modified electrode.