Tìm thấy 20+ kết quả cho từ khóa "Glassy carbon electrode"
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Electrocatalytic determination of hydrazine by a glassy carbon electrode modified with PEDOP/MWCNTs-Pd nanoparticles. Determination of hydrazine at a platinum nanoparticle and poly(bromocresol purple) modified carbon. doi: 10.1002/pol . doi: 10.1021/la904463g 25. doi: 10.1142/s . doi: 10.1016/j.jelechem .
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Electrochemistry of 2,6-diaminopurine on multiwall carbon nanotube modified glassy carbon electrode. Abstract: The electrochemical oxidation of 2,6-diaminopurine (2,6-DAP) was studied in pH 7.4 phosphate buffer solution on multiwall carbon nanotube modified glassy carbon electrode (MWCNT/GCE) over a temperature range of 20 to 50 ◦ C using cyclic voltammetry. 2,6-DAP oxidation on MWCNT/GCE showed a well-defined and irreversible oxidation peak at about 0.72 V vs.
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nanocomposite using pomelo leaf extract solubilized Na fi on modi fi ed glassy carbon electrode. The electrocatalytic performance of G-SrWO 4 solu- bilized Nafion (Nf) (G-SrWO 4 /Nf) modified GC electrode was evaluated for uric acid (UA) detection. The G-SrWO 4 /Nf modified GC electrode dis- played excellent electrocatalytic performance in UA sensing.
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Electrochemical determination of Sudan IV in food samples by using graphene-modified glassy carbon electrodes. Abstract: A simple and sensitive modified electrode was fabricated with graphene via the drop-casting method and applied for the electrochemical detection of Sudan IV. The experimental conditions such as determining medium, scan rate, and accumulation time were optimized for the determination of Sudan IV.
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In this study, Au nanoparticles (AuNPs) mixed-valence ruthenium and vanadium oxide (VOx-RuOx) films were fabricated on the carbon nanotube (CNT) modified glassy carbon electrode for the sensitive determination of hydrazine.. This sensor platform is used for the first time in the literature for the determination of hydrazine.
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The same conclusion was reached by the authors studying the oxidation of morin on a platinum electrode. 24 Other authors observed two anodic peaks in the study of oxidation of a powder of morin mechanically fixed on the surface of a GCE. 25 One was attributed to a one-electron oxidation in ring B and the second to one-electron oxidation of hydroxyl groups in ring A. 25 On the other hand, in the oxidation of morin at a pencil graphite electrode (pH 3.25), 15 glassy carbon electrode (pH and carbon
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The square wave voltammetric method for the determination of aclonifen herbicide showed an oxidation peak at +1175 mV on the glassy carbon electrode (GCE) in a pH 4 B–. R buffer solution. 40 Aclonifene was taken at the same concentration as phenmedipham (1 mg/L) and the relative error in recovery of phenmedipham was +4.3%. If the aclonifen concentration exceeded the phenmedipham concentration by 5- or 10-fold, the relative error in the phenmedipham assay was below the 5% tolerance limit..
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Cyclic voltammetry of MCzCTB was performed in monomer-free solution on a glassy carbon electrode (GCE) in various initial monomer concentrations in 1 M H 2 SO 4 solution, a) [MCzCTB] 0 = 1 mM. Potential range: 0.0 V–0.4 V, d) [MCzCTB] 0 = 10 mM. FTIR-ATR spectrum of P(MCzCTB)/CFME, 30 cycles, 0.1 M NaClO 4 /CH 3 CN..
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Herein, a modified glassy carbon electrode (GCE) was fabricated as voltammetric working electrode for the electrochemical determination of spiramycin.. Because of the importance of spiramycin quantification, a glassy carbon electrode modified with carboxylic MWCNTs (MWCNTs-COOH) was proposed as a spiramycin sensor in present study.
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In the present work, AgNPs/PAP/GCE catalyst has been prepared by electrochemical synthesis of AgNPs after electrochemical formation of poly aminophenol film on glassy carbon electrode surface. and chemical characterization of the AgNPs/PAP/GCE was carried out by SEM, TEM, EDX, XPS, and EIS techniques. The SEM images revealed that spherical AgNPs were distributed homogeneously on the PAP/GCE with the average size of approximately 100 nm.
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It was stated that DESL gave a reduction peak on the hanging mercury drop electrode (HDME) at approximately –1.48 V in BR buffer (pH . 9.0) medium on the glassy carbon electrode (GCE) by cyclic voltammetry (CV) and SWV techniques [22].
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The influence of the working electrode. It is well known that the electrode material influences the electrochemical behavior of an analyte and the shape of the corresponding voltammograms. Therefore, the cyclic voltammograms were recorded on 2 carbon- based working electrodes, namely the glassy carbon electrode (GCE) and the PGE for a M famotidine solution in different supporting electrolytes (0.1 M H 2 SO 4 , acetate buffer solution (ABS) pH 4.06, and phosphate buffer solution (PBS) pH 6.81).
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The aforementioned methods are based on cathodic potential scanning for voltammetric determination of boron.. 28 reported a differential pulse voltammetric method based on oxidation of Tiron (Scheme 1) in the boron–Tiron complex at a glassy carbon electrode (GCE). This behavior enables boric acid to be de- termined in the samples. To the best of our knowledge, there is no study on the determination of boron in any real samples using a disposable pencil graphite electrode..
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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.
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Comparative investigations using nickel, iron oxide, and gold nanoparticles were implemented with an electrochemical biosensor for bisphenol A detection and the detection limits were obtained as 1.62 ng mL ng mL − 1 , and 2.28 ng mL − 1 , respectively. 30 Amperometric detection of bisphenol A was also investigated in milk by utilizing PAMAM-Fe 3 O 4 modified glassy carbon electrode and a detection limit of 1.14 ng mL − 1 was achieved.
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The surface of the glassy carbon electrode was polished with alumina before electrode preparation. Then 5 µL of the ink was spread on the surface of the glassy carbon electrode. Cyclic voltammograms and chronoamperomograms were recorded in 0.5 M H 2 SO 4 + 1 M CH 3 OH solution on these catalysts.
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A glassy carbon electrode is most commonly used in the electrochemical cell. In the configuration shown in Figure 4.16, the column effluent flows across a glassy carbon electrode, whereas in another popular configuration, the sample flows through a porous graphite electrode. Several electrode styles are available, for example, Figure 4.16c shows a dual-electrode configuration.
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Sun, Y., et al.(2009), Simultaneous determination of dopamine and serotonin using a carbon nanotubes-ionic liquid gel modified glassy carbon electrode. Ivaska, Applications of ionic liquids in electrochemical sensors.. Chen(2003), Room temperature ionic liquid as a novel medium for liquid/liquid extraction of metal ions. Zhao, C., et al.(2008), Electrochemistry of Room Temperature Protic Ionic Liquids..
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The poly(malachite green) (PMG) and multiwalled carbon nanotubes (MWCNTs) were coimmobilized at the surface of the glassy carbon electrode (GCE) for fabrication of PMG/MWCNT/GCE. Using DPV, the obtained catalytic peak current was linearly dependent on the ascorbic acid (AA), epinephrine (EP), and uric acid (UA) concentrations in the ranges of and 0.3–90.0 µ M, respectively. The resul- tant detection limits for AA, EP, and UA were and 0.12 µ M, respectively.
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The voltammetric detection of the interaction between lycorine (LYC) and calf thymus dsDNA/calf thymus single-stranded DNA (ssDNA) was studied based on the oxidation signals of guanine and adenine by using DPV at a carbon paste electrode (CPE) and PGE. 25 studied the electrochemical monitoring of the interaction between the anthraquinone drug mitoxantrone (MTX) and dsDNA or ssDNA by using a glassy carbon electrode (GCE) in connection with square-wave voltammetry (SWV) and differential pulse voltammetry