scholarly journals Electrochemical Detection of Dopamine at Fe3O4/SPEEK Modified Electrode

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5357
Author(s):  
Mogomotsi N. Ranku ◽  
Gloria E. Uwaya ◽  
Omolola E. Fayemi
Keyword(s):  
Modified Electrode ◽  
Square Wave Voltammetry ◽  
Electrochemical Behaviour ◽  
Phosphate Buffer Solution ◽  
Buffer Solution ◽  
X Ray ◽  
Polyether Ether Ketone ◽  
Wave Voltammetry ◽  
Ether Ketone ◽  
Screen Print

Reported here is the design of an electrochemical sensor for dopamine (DA) based on a screen print carbon electrode modified with a sulphonated polyether ether ketone-iron (III) oxide composite (SPCE-Fe3O4/SPEEK). L. serica leaf extract was used in the synthesis of iron (III) oxide nanoparticles (Fe3O4NPs). Successful synthesis of Fe3O4NP was confirmed through characterization using Fourier transform infrared (FTIR), ultraviolet–visible light (UV–VIS), X-ray diffractometer (XRD), and scanning electron microscopy (SEM). Cyclic voltammetry (CV) was used to investigate the electrochemical behaviour of Fe3O4/SPEEK in 0.1 M of phosphate buffer solution (PBS) containing 5 mM of potassium ferricyanide (III) solution (K3[Fe(CN)6]). An increase in peak current was observed at the nanocomposite modified electrode SPCE-Fe3O4/SPEEK) but not SPCE and SPCE-Fe3O4, which could be ascribed to the presence of SPEEK. CV and square wave voltammetry (SWV) were employed in the electroxidation of dopamine (0.1 mM DA). The detection limit (LoD) of 7.1 μM and 0.005 μA/μM sensitivity was obtained for DA at the SPCE-Fe3O4/SPEEK electrode with concentrations ranging from 5–50 μM. LOD competes well with other electrodes reported in the literature. The developed sensor demonstrated good practical applicability for DA in a DA injection with good resultant recovery percentages and RSDs values.

The first report of X-ray characterized organosilatrane-based receptors for the electrochemical analysis of Al3+ ions

2021 ◽  
Author(s):  
Gurjaspreet Singh ◽  
Sanjay Sharma ◽  
Akshpreet Singh ◽  
Ranjeet Kaur ◽  
Pawan ◽  
...  
Keyword(s):  
Gold Electrode ◽  
Square Wave Voltammetry ◽  
Electrochemical Behaviour ◽  
Electrochemical Analysis ◽  
Alkyl Ether ◽  
X Ray ◽  
First Report ◽  
Square Wave ◽  
Wave Voltammetry

The electrochemical behaviour of aryl–alkyl ether functionalized organosilatranes has been studied by square wave voltammetry (SWV) using a gold electrode.

Photoelectrochemical Sensing of Hydrazine Based on Palladium Film Modifying N-Silicon Electrode under Visible Irradiation

2014 ◽  
Vol 1006-1007 ◽  
pp. 811-814
Author(s):  
Huai Xiang Li ◽  
Jin Chao Hu ◽  
Qiong Wu ◽  
Wen Hua Song
Keyword(s):  
Cyclic Voltammetry ◽  
Electron Microscope ◽  
Modified Electrode ◽  
Photoelectron Spectroscopy ◽  
Phosphate Buffer Solution ◽  
Buffer Solution ◽  
X Ray ◽  
Visible Irradiation ◽  
Photo Electrode ◽  
Scanning Electron

In this work, a palladium film has been evaporated on an n-silicon (n-n+-Si) surface and electrochemically activated by cyclic voltammetry (CV) to form a modified silicon photo-electrode. Scanning electron microscope (SEM) and x-ray photoelectron spectroscopy (XPS) were used to characterize the morphology and composition of the modified electrode surface. A new photoelectrochemical (PEC) cell based on the modified electrode was used as sensor for hydrazine determination by photocurrent measurements. The sensor showed good photocurrent responses by adding different concentrations of hydrazine with a good stability. The linear ranges for the detection of hydrazine are 2 to 20 μM with a detection limit of 0.5 μM in pH=7.0 phosphate buffer solution (PBS).

scholarly journals Voltammetric determination of resveratrol using poly(l-phenylalanine)-modified gold electrode

2020 ◽  
Vol 39 (2) ◽  
pp. 177
Author(s):  
Öznur Güngör ◽  
Chedia Ben Ali Hassine ◽  
Muammer Burç ◽  
Serap Titretir Duran
Keyword(s):  
Gold Electrode ◽  
Red Wine ◽  
Square Wave Voltammetry ◽  
Limit Of Detection ◽  
Phosphate Buffer Solution ◽  
Standard Addition ◽  
Buffer Solution ◽  
Wave Voltammetry ◽  
Limit Of Quantitation

In this study, we investigated the electrochemical modification of a gold electrode using poly(L-phenylalanine) and its applicability for the quantification of resveratrol (RESV). The gold electrode was modified with L-phenylalanine employing cyclic voltammetry (CV) in aqueous solution. The detection of RESV with the modified electrode was investigated by square wave voltammetry (SWV) in a phosphate buffer solution (PBS) (pH = 1.2). The analytical calibration curve for RESV showed a linear response with concentration in the oxidation peak current range from 50 to 1000 µM, with a limit of detection (LOD) of 35.16 µM and limit of quantitation (LOQ) of 105.5 µM. The application of the prepared electrochemical sensor was carried out with a standard addition method in red wine samples.

Hg(II) Analysis Using Poly(cysteine)-rGO Electrode

2020 ◽  
Vol 18 (3) ◽  
pp. 179-187
Author(s):  
J. Jency Feminus ◽  
P. N. Deepa
Keyword(s):  
Modified Electrode ◽  
Metal Ion ◽  
Square Wave Voltammetry ◽  
Electrochemical Behaviour ◽  
Electrochemical Determination ◽  
Mercury Determination ◽  
Selective Determination ◽  
Wave Voltammetry ◽  
Reduced Graphene

In the present work, we have developed a sensitive platform for the selective determination of Hg(II) ions based on reduced graphene oxide (rGO) electrode modified with poly cysteine (Poly-Cys). The Poly-Cys/rGO modified electrode was characterised by SEM, ATR-IR and its electrochemical behaviour was investigated through cyclic voltammetry and square wave voltammetry. The synergistic effect of rGO and poly-cysteine favoured the complexation of Hg(II) ions onto the surface of the modified electrode. The ions were then anodically stripped and the corresponding voltammograms recorded. The process of complexation followed by stripping was repeated with increasing concentrations of the metal ion. The linear range for the electrochemical determination of Hg(II) using the modified electrode was found to be from 0.05 to 2.7 μM with a detection limit of 0.006 μM. In addition, the electrode also exhibited good stability with negligible sensitivity towards interfering metal ions. The analytical applicability of the modified electrode was investigated by carrying out mercury determination in water samples obtained from various sources.

An electrochemical detection of cadmium (II) and lead (II) ions using a polymer-modified electrode with a Schiff base by square wave voltammetry

2021 ◽  
Author(s):  
Mohammed Qasim Mohammed ◽  
Hani Khalil Ismail ◽  
Hasan Fisal Alesary ◽  
Stephen Barton
Keyword(s):  
Schiff Base ◽  
Modified Electrode ◽  
Electrochemical Detection ◽  
Square Wave Voltammetry ◽  
Electrochemical Behaviour ◽  
Modified Electrodes ◽  
Polymer Coatings ◽  
Square Wave ◽  
Enhanced Sensitivity ◽  
Wave Voltammetry

Abstract The work herein concentrates on the electrochemical detection of heavy metal ions, specifically cadmium and lead ions. The introduction and modification of functional groups such as Schiff bases had led to an enhanced sensitivity of the electrode to analytes. In this study, a platinum electrode has for the first time been modified with poly(3,4- ethylenedioxythiophene) (PEDOT/Schiff base) in CH2Cl2 containing Bu4NPF6 for use to detection cadmium (II) and lead (II) ions. The structure and morphology of the polymer coatings were characterised by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM), respectively. The electrochemical synthesis and redox state response in monomer-free synthesised films have been studied by cyclic voltammetry. Moreover, the effect of scan rate on the electrochemical behaviour of the modified electrodes was also studied. The voltammetric findings have been used to calculate the surface coverage required for the polymer films and the stability of polymer electrodes in the monomer-free solutions. Square wave voltammetry (SWV) was applied for the determination of cadmium (II) and lead (II) ion concentrations and to assess the effects of pH on aqueous samples. The limits of detection for the modified electrode for cadmium (II) and lead (II) were found to be 0.95 μg L-1 and 1.84 μg L-1, respectively. These findings revealed that modified films can be considered good candidates for application in electrochemical detection devices

Electrochemical and Phase Analysis of Si(IV) on Fe Electrode in Molten NaCl-NaF-KCl-SiO2 System

2018 ◽  
Vol 37 (9-10) ◽  
pp. 921-928 ◽  
Author(s):  
Hui Li ◽  
Jinglong Liang ◽  
Shanshan Xie ◽  
Ramana G. Reddy ◽  
Lanqing Wang
Keyword(s):  
Cyclic Voltammetry ◽  
Square Wave Voltammetry ◽  
Electrochemical Reaction ◽  
Electrochemical Behaviour ◽  
Three Dimensional ◽  
Ion Diffusion ◽  
Reversible Process ◽  
X Ray ◽  
Wave Voltammetry ◽  
Molten Salt System

AbstractThe electrochemical behaviour of Si(IV) ions on Fe electrode in the NaCl-NaF-KCl-SiO2 molten salt system (0.177 mol·L−1 SiO2) at 1,103 K was studied by using cyclic voltammetry, square wave voltammetry, chronoamperometry, and chronopotentiometry．Experiments conducted using the first two methods indicated that the reduction of Si(IV) occurred in two steps: Si(IV) → Si(II) → Si(0). Furthermore, the electrochemical reaction is a quasi-reversible process, which is controlled by both the ion diffusion and electron transport rates. The electrochemical crystallization of Si was found to be a transient, the three-dimensional nucleation process. The cyclic voltammetry curves indicate that the diffusion coefficient of Si(IV) is 1.16×10–5 cm2·s−1. The phases formed on the surface of the deposit were analysed by scanning electron microscopy and X-ray diffractometer. The results show that Fe and Si have formed intermetallic compounds Fe3Si, FeSi, and Fe5Si3.

scholarly journals Square-wave voltammetric determination of rutin in pharmaceutical formulations using a carbon composite electrode modified with copper (II) phosphate immobilized in polyester resin

2012 ◽  
Vol 48 (4) ◽  
pp. 639-649 ◽  
Author(s):  
Kellen Heloizy Garcia Freitas ◽  
Orlando Fatibello-Filho ◽  
Ivanildo Luiz de Mattos
Keyword(s):  
Modified Electrode ◽  
Composite Electrode ◽  
Polyester Resin ◽  
Pharmaceutical Formulations ◽  
Carbon Composite ◽  
X Ray ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Carbon Composite Electrode

A carbon composite electrode modified with copper (II) phosphate immobilized in a polyester resin (Cu3(PO4)2-Poly) for the determination of rutin in pharmaceutical samples by square-wave voltammetry is described herein. The modified electrode allows the determination of rutin at a potential (0.20 V vs. Ag/AgCl (3.0 mol L-1 KCl)) lower than that observed at an unmodified electrode. The peak current was found to be linear to the rutin concentration in the range from 9.9 × 10-8 to 2.5 × 10-6 mol L-1, with a detection limit of 1.2×10-8 mol L-1. The response of the electrode was stable, with no variation in baseline levels within several hours of continuous operation. The surface morphology of the modified electrode was characterized by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) system. The results obtained are precise and accurate. In addition, these results are in agreement with those obtained by the chromatographic method at a 95% confidence level.

Fabrication of Graphene/Carbon Nanotube Composite Modified Electrode for Selective and Sensitive Determination of Uric Acid

2013 ◽  
Vol 641-642 ◽  
pp. 562-565
Author(s):  
Zheng Xiao Liu ◽  
Jian Fei Xia ◽  
Zong Hua Wang ◽  
Yan Zhi Xia ◽  
Fei Fei Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Uric Acid ◽  
Carbon Nanotube ◽  
Modified Electrode ◽  
Phosphate Buffer Solution ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Sensitive Determination ◽  
Carbon Nanotube Composite

A novel composite was firstly synthesized by compositing graphenes (G) and carbon nanotubes (CNTs) and then a new composite modified electrode (G/CNTs/GCE) was prepared by coating the resulting composite on the surface of the glassy carbon electrode (GCE). The composite modified electrode G/CNTs/GCE showed great electrochemical activities which were studied by sensitive determining the electrochemistry behaviors of uric acid (UA). It revealed when the concentration range of UA changed from 1×10-7 mol/L to 1×10-3 mol/L, the peak currents had linear relationship with the concentration of UA in the phosphate buffer solution (PBS) which the value of pH is 7.0. And the linear equation is ip (μA) = 21.55C+28.94 (C: mmol/L), with the related coefficient 0.9964.

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