scholarly journals Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3998
Author(s):  
Mohammed M. Rahman ◽  
M. M. Alam ◽  
Sulaiman Y. M. Alfaifi ◽  
Abdullah M. Asiri ◽  
Meser M. Ali
Keyword(s):  
Glassy Carbon ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Sensors ◽  
Phosphate Buffer Solution ◽  
Calibration Plot ◽  
Composite Electrodes ◽  
Detection Range ◽  
X Ray ◽  
Sandwich Type ◽  
Sensor Probe

In this research study, we developed a voltammetric electrochemical sensor probe with a copolymer Nafion (Sulfonated Tetrafluoroethylene-based Fluoro-polymer) decorated with hydrothermally prepared sandwich-type CuO/ZnO nanospikes (NSs) onto a glassy carbon electrode (GCE) for reliable thiourea (TU) detection. The detailed characterizations in terms of structural morphology, binding energy, elemental compositions, grain size and crystallinity for synthesized NSs were performed by field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis, respectively. The differential pulse voltammetric (DPV) analysis for TU showed good linearity at current-versus-TU concentration on the calibration plot in the 0.15~1.20 mM range, which is defined as a dynamic detection range (LDR) of TU in a phosphate buffer solution. Considering the slope of LDR over the GCE-coated NSs surface area (0.0316 cm2), the TU sensor sensitivity (0.4122 µA µM−1 cm−2) was obtained. Besides this, the low limit (LOD) for TU detection was calculated and found to be 23.03 ± 1.15 µM. The fabricated Nafion/CuO/ZnO NSs/GCE sensor probe was created as a reliable sensor based on reproducibility, interference effect, stability and response time. Real bio-samples were investigated and the results confirm the anticipated reliability of the TU sensor probe. Thus, this is a noble way to develop enzyme-free electrochemical sensors that could be an alternative approach for the detection of chemicals in the field of enzyme-free biosensor development technology.

scholarly journals A facile synthesis of GO/CuO-blended nanofiber sensor electrode for efficient enzyme-free amperometric determination of glucose

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Medha Gijare ◽  
Sharmila Chaudhari ◽  
Satish Ekar ◽  
Anil Garje
Keyword(s):  
Photoelectron Spectroscopy ◽  
Research Work ◽  
Phosphate Buffer Solution ◽  
Linear Sweep Voltammetry ◽  
Morphological Properties ◽  
Buffer Solution ◽  
Amperometric Determination ◽  
Detection Range ◽  
X Ray ◽  
Sensing Performance

AbstractThe development of biosensors with innovative nanomaterials is crucial to enhance the sensing performance of as-prepared biosensors. In the present research work, we prepared copper (II) oxide (CuO) and graphene oxide (GO) composite nanofibers using the hydrothermal synthesis route. The structural and morphological properties of as-prepared GO/CuO nanofibers were analyzed using an X-ray diffractometer, field-emission scanning, energy dispersive X-ray analysis, Fourier transmission infrared spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The results indicated GO/CuO nanofibers exhibit nanosized diameters and lengths in the order of micrometers. These GO/CuO nanofibers were employed to prepare non-enzymatic biosensors (GO/CuO nanofibers/FTO (fluorine-doped tin oxide)) modified electrodes for enhanced glucose detection. The sensing performance of the biosensors was evaluated using linear sweep voltammetry (LSV) and chronoamperometry in phosphate buffer solution (PBS). GO/CuO/FTO biosensor achieved high sensitivity of 1274.8 μA mM−1cm−2 having a linear detection range from 0.1 to 10 mM with the lower detection limit (0.13 μM). Further, the prepared biosensor showed good reproducibility repeatability, excellent selectivity, and long-time stability. Moreover, the technique used for the preparation of the GO/CuO composite is simple, rapid, cost-effective, and eco-friendly. These electrodes are employed for the detection of glucose in blood serum with RSD ~ 1.58%.

Facile caffeine electrochemical detection via electrodeposited Ag nanoparticles with modifier polymers on carbon paste sensor at aqueous and micellar media

2020 ◽  
Vol 98 (4) ◽  
pp. 169-178 ◽  
Author(s):  
M. Shehata ◽  
S.M. Azab ◽  
A.M. Fekry
Keyword(s):  
Ag Nanoparticles ◽  
Surface Characterization ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Electrochemical Techniques ◽  
Calibration Plot ◽  
Micellar Media ◽  
Carbon Paste ◽  
Detection Range ◽  
X Ray

The analysis and detection of caffeine (Caf) is very useful due to its widespread usage in several daily consumed beverages, food products, and pharmacological preparations with various physiological effects. The preparation of a newly electrodeposited Ag nanoparticles – cellulose acetate phthalate (CAP) – chitosan (Chit) modified carbon paste (ACCMCP) sensor for sensitive determination of Caf in 0.01 mol L−1 H3PO4 solution (pH 1.0–5.0) both in aqueous and micellar media (0.5 mmol L−1 SDS) was achieved. The interaction of Caf was monitored using electrochemical techniques such as cyclic voltammetry, differential pulse voltammetry, electrochemical impedance spectroscopy, and chronoamperometry, and surface characterization was carried out using X-ray diffraction, scanning electron microscope, and energy dispersive X-ray techniques. The linear detection range of Caf was between 4 and 500 μmol L−1 (r2 = 0.955) and the limit of detection obtained from the calibration plot was 0.252 μmol L−1. The sensor was applicable for detecting Caf in numerous real samples with recoveries from 98.03% to 101.60% without interference of any accompanying species, which ensures high method selectivity.

scholarly journals Alkyl-group grafting onto glassy carbon cathodes by reduction of primary monohaloalkanes: electrochemistry and X-ray photoelectron spectroscopy studies

2020 ◽  
Vol 856 ◽  
pp. 113531 ◽  
Author(s):  
J. Tyler Barnes ◽  
Kent J. Griffith ◽  
Joshua A. Beeler ◽  
Benjamin H.R. Gerroll ◽  
Ana G. Couto Petro ◽  
...  
Keyword(s):  
Glassy Carbon ◽  
Photoelectron Spectroscopy ◽  
Alkyl Group ◽  
X Ray ◽  
Spectroscopy Studies ◽  
Grafting Onto

Polysulfide/Graphene Nanocomposite Film for Simultaneous Electrochemical Determination of Cadmium and Lead Ions

NANO ◽  
2018 ◽  
Vol 13 (08) ◽  
pp. 1850090 ◽  
Author(s):  
Ruyuan Jiang ◽  
Niantao Liu ◽  
Yuhong Su ◽  
Sanshuang Gao ◽  
Xamxikamar Mamat ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Heavy Metal ◽  
Photoelectron Spectroscopy ◽  
Metal Ion ◽  
Electrochemical Sensors ◽  
Anodic Stripping Voltammetry ◽  
Pyrolytic Graphite ◽  
Stripping Voltammetry ◽  
Ion Concentration ◽  
X Ray

An integrative electroanalytical method was developed for detecting Cd[Formula: see text] and Pb[Formula: see text] ions in aqueous solutions. Polysulfide/graphene (RGO-S) nanocomposites were prepared and their performance as electrochemical sensors for Cd[Formula: see text] and Pb[Formula: see text] was evaluated. The RGO-S nanocomposite was carefully characterized by scanning electron microscopy with energy-dispersive X-ray spectrometry, transmission electron microscopy, and X-ray photoelectron spectroscopy. The as-prepared RGO-S was incorporated into a pyrolytic graphite electrode (RGO-S/PGE) and used for detecting trace amount of Cd[Formula: see text] and Pb[Formula: see text] by differential pulse anodic stripping voltammetry. Under optimal conditions, the stripping peak current of RGO-S/PGE varies linearly with heavy metal ion concentration in the ranges 2.0–300[Formula: see text][Formula: see text]g L[Formula: see text] for Cd[Formula: see text] and 1.0–300[Formula: see text][Formula: see text]g L[Formula: see text] for Pb[Formula: see text]. The limits of detection for Cd[Formula: see text] and Pb[Formula: see text] were estimated to be about 0.67[Formula: see text][Formula: see text]g L[Formula: see text] and 0.17[Formula: see text][Formula: see text]g L[Formula: see text], respectively. The prepared electrochemical heavy-metal-detecting electrode provides good repeatability and reproducibility with high sensitivity, making it a suitable candidate for monitoring Cd[Formula: see text] and Pb[Formula: see text] concentrations in aqueous environmental samples.

scholarly journals Scalable Synthesis and Electrochemical Properties of Porous Si-CoSi2-C Composites as an Anode for Li-ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5397
Author(s):  
Hyungeun Seo ◽  
Hae-Ri Yang ◽  
Youngmo Yang ◽  
Kyungbae Kim ◽  
Sung Hyon Kim ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
High Capacity ◽  
High Energy ◽  
Attractive Alternative ◽  
Composite Electrodes ◽  
Li Ion Batteries ◽  
Porous Si ◽  
X Ray ◽  
Synthesis Strategy ◽  
Li Ion

Si-based anodes for Li-ion batteries (LIBs) are considered to be an attractive alternative to graphite due to their higher capacity, but they have low electrical conductivity and degrade mechanically during cycling. In the current study, we report on a mass-producible porous Si-CoSi2-C composite as a high-capacity anode material for LIBs. The composite was synthesized with two-step milling followed by a simple chemical etching process. The material conversion and porous structure were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and electron microscopy. The electrochemical test results demonstrated that the Si-CoSi2-C composite electrode exhibits greatly improved cycle and rate performance compared with conventional Si-C composite electrodes. These results can be ascribed to the role of CoSi2 and inside pores. The CoSi2 synthesized in situ during high-energy mechanical milling can be well attached to the Si; its conductive phase can increase electrical connection with the carbon matrix and the Cu current collectors; and it can accommodate Si volume changes during cycling. The proposed synthesis strategy can provide a facile and cost-effective method to produce Si-based materials for commercial LIB anodes.

scholarly journals Preparation and Application of Keggin Silicomolybdic acid Modified Electrode

2020 ◽  
Author(s):  
Miao Liu ◽  
Mingxuan Jia ◽  
Dong Hui Li
Keyword(s):  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Photoelectron Spectroscopy ◽  
Limit Of Detection ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
X Ray ◽  
Linear Relationships

Abstract An innovative method for the determination of isoniazid tablets is studied through electrochemical method for the modification of glassy carbon electrode (GCE). Polyoxomolybdate, with stable structures, has not been widely used for the determination of substance. In this study, the mentioned polyoxomolybdate was characterized by Fourier transform infrared spectroscopy (FT-IR), UV-vis, X-ray diffraction (XRD), Atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS), and used to modify the glassy carbon electrode. The electrochemical performance of the polyoxomolybdate@GCE was investigated with cyclic voltammetry (CV) and differential pulse voltammetry (DPV), compared with the unmodified electrode, the proposed polyoxomolybdate modified electrode exhibited strong electro-catalytic activities towards isoniazid (INH). Under the optimized conditions, there was linear relationships between the DPV peak currents and the concentrations in the range of 1 × 10 -7 g/L to 3 × 10 -7 g/L for INH (R 2 = 0.9979), with the limit of detection (LOD) of 0.024 μg/L (based on S/N = 3). The modified electrode has proper reproducibility (RSD < 5%), stability, response time (< 3 min) and lifetime (up to 6 days).

Fabrication of Electrochemical Sensors Based on Nanostructured Titanium Dioxide Formed through Anodic Oxidation

2015 ◽  
Vol 245 ◽  
pp. 182-189 ◽  
Author(s):  
Nikolai B. Kondrikov ◽  
Antonina S. Lapina ◽  
Ilya V. Stepanov ◽  
Galina I. Marinina ◽  
Vladimir V. Korochentsev ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Titanium Dioxide ◽  
Anodic Oxidation ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Sensors ◽  
Structural Features ◽  
X Ray ◽  
Different Types ◽  
Scanning Electron

The nanotubular titanium dioxide structures were prepared using anodic oxidation. The structural features of surface have been investigated by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy-dispersive spectroscopy (EDS) techniques. These nanotubular titanium dioxide structures can be used as a sensor in potentiometric indication components of different types of chemical reactions.

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