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This study addressed the use of manganese dioxide nanorods/graphene oxide nanocomposite (MnO2 NRs/GO) for modifying a glassy carbon electrode (GCE). The modified electrode (MnO2 NRs/GO/GCE) was used as an electrochemical sensor for the determination of hydroquinone (HQ) in water samples. Differential pulse voltammetry (DPV), cyclic voltammetry (CV), and chronoamperometry were used for more analysis of the HQ electrochemical behavior. Analyses revealed acceptable electrochemical functions with lower transfer resistance of electrons and greater conductivity of the MnO2 NRs/GO/GCE. The small peak-to-peak separation is an indication of a rapid electron transfer reaction. Therefore, this result is probably related to the effect of the MnO2 NRs/GO nanocomposite on the surface of GCE. In the concentration range of 0.5 μM to 300.0 μM with the detection limit as 0.012 μM, there was linear response between concentration of HQ and the current. The selectivity of the modified electrode was determined by detecting 50.0 μM of HQ in the presence of various interferent molecules. At the end, the results implied the acceptable outcome of the prepared electrode for determining HQ in the water samples.

This works presents a novel electrochemical sensor based on third-generation of poly(amidoamine) dendrimer (G3 PAMAM)-functionalized multi-walled carbon nanotubes (MWCNTs) modified screen-printed graphite electrode (SPGE) for a simple and sensitive detection...

The present work reports the synthesis of MgCo2O4-rGO nanohybrid by a simple method. The nanohybrid was characterised by XRD, Raman spectroscopy, EDX, SEM, and TEM. An effective electrochemical sen...

In this work, a sensitive electrochemical sensor is provided for hydroxylamine, by Fe3O4@CuO core-shell nanocomposite on the screen printed graphite electrode (SPGE) surface. Fe3O4@CuO core-shell n...

A new bidentate Schiff base ligand [HL = N-(2-hydroxy-1-naphthylidene)-2-methyl aniline] and its mononuclear Cu(II) complex with formula [CuL2] were prepared and characterized by Fourier-transform infrared (FT-IR), Nuclear Magnetic Resonance [1H and 13C{1H} NMR], Ultraviolet–visible (UV–Vis) spectroscopic methods, and elemental analysis. The Schiff base ligand [HL] and Cu(II) complex [CuL2] crystal structures were determined using the single crystal X-ray diffraction method. The data of crystal structure indicated a bidentate method of coordination for the Schiff base by NO donor sets in a regular square-planar fashion. The nano-sized [CuL2] was synthesized by the sonochemical method and was detected by X-ray powder diffraction (XRD), Field Emission Scanning Electron Microscopes (FE-SEM), and FT-IR spectroscopy. The average particle size in nano-sized [CuL2] was approximately 55 nm. The nano-complex [CuL2] was used in a modified screen-printed electrode (modified SPE) as an electrochemical sensor for the detection of 2-phenylphenol. The oxidation reaction of 2-phenylphenol at the modified electrode indicated a linear range of 0.01–600.0 µM and the recognition limit was 8.0 nM. The proposed electrode shows two well-separated oxidation signals for 2-phenylphenol and 4-chlorophenol, which makes it suitable for the simultaneous determination of these analytes. The fabricated sensor was successfully applied for the designation of 2-phenylphenol in lemon rind, orange rind, and water samples with satisfactory recovery.

In this work, we have designed and developed a new electrochemical sensing platform to determine sulphite, with the aid of a carbon paste electrode modified with thallium doped Mn3O4 nanostructures...

Electrochemical sensing of bisphenol A by Mn3O4/ZrO2 nanocomposite-modified screen printed graphite electrode (SPGE) was explored. Mn3O4/ZrO2 nanocomposite was prepared through a simple method. Fie...

The detection of sulfamethoxazole, an antibacterial sulfonamide drug, is a very effective with antibiotic properties, and commonly used in the treatment of a variety of infections. Due to the importance in diseases treatment of humans and also of animals, the development of techniques for its quantification in body fluids is highly desirable. A voltammetric sensor is described for the determination of the antibiotic sulfamethoxazole. It is based on the use of a carbon paste electrode modified with a Fe3O4/ZIF-67 nanocomposite and ionic liquid (IL) 1-Butyl-3-methylimidazolium hexafluorophosphate (Fe3O4/ZIF-67/ILCPE). The morphology and structure of the nanocomposite were characterized by Fourier-transform infrared spectroscopy (FT-IR), x-ray diffraction (XRD), transmission electron microscopy(TEM) and field emission scanning electron microscopy (FESEM). Under the optimal conditions, the response of the electrode, typically measured between 0.74 and 1.1 V (vs. Ag/AgCl), increases linearly in the 0.01−520.0 µM sulfamethoxazole concentration range, and the lower detection limit is 5.0 nM. Moreover, this electrode could substantially be applied for the analysis of sulfamethoxazole in the real samples (e.g., urine, tap water and river water).

Ceftizoxime (CFX) is used to reduce the infection caused by both gram-negative and gram-positive bacteria. In this report, a novel electrochemical sensor for CFX comprising a Cu(Him)2 nanoparticles and ionic liquid (IL) hybride modified carbon paste electrode (CPE) has been developed. The structural properties of Cu(Him)2 nanoparticles was characterized using energy-dispersive X-ray spectroscopy (EDX) analyses, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM). The results illustrate that Cu(Him)2/ILCPE exhibits an excellent electrocatalytic effect in the electrooxidation of CFX that leads to a considerable improvement in the corresponding anodic peak current. Under the best experimental conditions, the sensor exhibited a linear response to CFX from 2.0 to 1000.0 μM, with a limit of detection (LOD) of 0.5 nM. Finally, this also allows the development of a highly sensitive voltammetric sensor for the determination of CFX in pharmaceutical and biological samples.

The present study introduces a novel Ni–Mo-MOF-modified screen printed electrode (Ni–Mo-MOF/SPE) to sensitively and rapidly detect amaranth. Cyclic voltammetry (CV) was also applied to evaluate the electrochemical behavior of amaranth on the surfaces of bare SPE and Ni–Mo-MOF/SPE, and differential pulse voltammetry (DPV) to calculate linearly detection range of amaranth. According to the results, various linear oxidation peak currents were obtained at different concentrations (between 0.15 ± 0.001 and 500.0 ± 0.001 µM) and the limit of detection (LOD) was estimated to be 0.05 ± 0.001 µM in the optimal conditions. Additionally, the efficacy of developed electrode was tested by real samples, the results of which were satisfactory. The proposed Ni–Mo-MOF/SPE not only had special properties such as high selectivity, high sensitivity, cost-effectiveness and rapid response, but also was shown to possess wide applications for sensitively amaranth detection in real samples.

This research constructed and utilized a screen-printed electrode (SPE) modified with V2O5 nanoparticles (NPs) (V2O5/SPE) employed in order to sensitively and selectively quantify ciprofloxacin with exceptional accuracy in the phosphate buffer solution (PBS) with the use of differential pulse voltammetry (DPV). Moreover, electrochemical properties of this new V2O5/SPE sensor have been examined using diverse characterization procedures. Very good V2O5/SPE electrochemical features offered sensitive ciprofloxacin voltammetric determination with the reduced limit of detection (LOD = 0.01 µM) toward electrocatalytic oxidation of ciprofloxacin in comparison with the bare SPE. Finally, this new disposable sensor exhibited higher sensitivity and thus has been efficiently utilized to determine ciprofloxacin in the real samples.