Conducting polymers have elicited much interest among researchers because of their reasonably good conductivity, stability, ease preparation, affordability and redox properties compared to other organic compounds. In particular, the electronic electrochemical conducting made them find applications in photovoltaic cells, light emitting diode sensors. Among polymers, polyaniline has received attention intensive research work been performed with polymer its native state or functionalized form....

Nickel oxide (NiO) semiconductor is an interesting material in photocatalysis applications due to its p-type nature and high hole concentration properties. These properties of NiO promote effective p-n heterojunctions interfacial charge carriers' separation transmission efficiency for improved photocatalytic performance. The review discusses the heterostructures with application focus photodegradation removal various organic wastewater contaminants. mechanism NiO-based photocatalysts respect...

A Nafion-Graphene (Nafion-G) nanocomposite solution in combination with an situ plated mercury film electrode was used as a highly sensitive electrochemical platform for the determination of Zn2+, Cd2+, Pb2+ and Cu2+ 0.1 M acetate buffer (pH 4.6) by square-wave anodic stripping voltammetry (SWASV). Various operational parameters such deposition potential, time rotation speed were optimized. The Nafion-G sensing exhibited improved sensitivity metal ion detection, addition to well defined,...

A simple and highly sensitive electrochemical DNA aptasensor with high affinity for endocrine disrupting 17β-estradiol, was developed. Poly(3,4-ethylenedioxylthiophene) (PEDOT) doped gold nanoparticles (AuNPs) electrochemically synthesized employed the immobilization of biotinylated aptamer towards detection target. The diffusion coefficient nanocomposite 6.50 × 10−7 cm2 s−1, which showed that conducting. Electrochemical impedance investigation also revealed catalytic properties an exchange...

An aflatoxin B₁ (AFB₁) electrochemical immunosensor was developed by the immobilisation of B₁-bovine serum albumin (AFB₁-BSA) conjugate on a polythionine (PTH)/gold nanoparticles (AuNP)-modified glassy carbon electrode (GCE). The surface AFB₁-BSA covered with horseradish peroxidase (HRP), in order to prevent non-specific binding immunosensors ions test solution. AFB₁ exhibited quasi-reversible electrochemistry as indicated cyclic voltammetric (CV) peak separation (ΔE

A novel electrochemical sensor for the detection of anthracene was prepared by modifying a glassy carbon electrode (GCE) with over-oxidized polypyrrole (PPyox) and Ag-Au (1:3) bimetallic nanoparticles (Ag-AuNPs). The composite (PPyox/Ag-AuNPs/GCE) potentiodynamic polymerization pyrrole on GCE followed its overoxidation in 0.1 M NaOH. were chemically reduction AgNO3 HAuCl4 using C6H5O7Na3 as reducing agent well capping then immobilized surface PPyox/GCE. characterized UV-visible spectroscopy...

An electrochemical platform was developed based on a pencil-graphite electrode (PGE) modified with electrochemically reduced graphene oxide (ERGO) sheets and in conjunction an situ plated bismuth-film (ERGO-PG-BiE). The ERGO-PG-BiE used as sensing for determining Zn2+, Cd2+ Pb2+ by square wave anodic stripping voltammetry (SWASV). ERGO were deposited to electrodes cyclic voltammetric reduction from (GO) solution. GO, flake thicknesses varying between 1.78 2.10 nm (2 sheets) characterized...

We report a rapid and simple method for sensing estradiol by electro-oxidation on multi-walled carbon nanotube (MWCNT) gold nanoparticle (AuNP) modified glassy electrode (GCE). Compared with bare GCE, AuNP/GCE MWCNT/GCE, the composite GCE shows an enhanced response to in 0.1 M phosphate buffer solution. Experimental parameters, including pH accumulation time determination were optimised at AuNP/MWCNT/GCE. A of 7.0 was found be optimum 5 minutes. Estradiol determined linear sweep voltammetry...

Abstract Electroanalytical techniques are powerful tools in biological sensing because of their sensitivity and versatility. In recent decades, great attention has been given to the fabrication electroactive nanomaterial‐based biosensors. this context, carbon quantum dots (CQDs) have received special used develop many sensors remarkable advantages such as high photostability, solubility stability water, biocompatibility, photoluminescence emission intensities, simple methods synthesis. Since...

Abstract In host‐guest chemistry, cucurbiturils are macrocyclic molecules made of glycoluril monomers linked by methylene bridges. This compound was applied in the design electrochemical sensors for detection biogenic amines. Biogenic amines (BAs) organic bases, which can be present food and cause several adverse reactions consumers. The most significant BAs occurring histamine, serotonin, dopamine. Limited studies have been reported on thin film cucurbituril‐modified solution‐based studies....

South African Carpobrotus species have been found to contain hydrolyzable tannins, various flavonoids e.g. rutin and hyperoside, phytosterols aromatic acids which a diverse range of pharmacological properties; including antimicrobial antioxidant activities. In this paper we described the identification quantification catechin in C. mellei quadrifidus using cyclic square wave voltammetry. The oxidation potential ranges from +171.0 mV +631.6 mV. mechanism proceeds sequential steps, related...

The adsorptive stripping voltammetric detection of nickel and cobalt in water samples at metal film electrodes has been extensively studied. In this work, a novel, environmentally friendly, metal-free electrochemical probe was constructed for the ultra-trace determination Ni2+ by Adsorptive Cathodic Stripping Voltammetry (AdCSV). platform is based on accumulation ions directly onto glassy carbon electrode (GCE) modified with dimethylglyoxime (DMG) as chelating agent Nafion-graphene (NGr)...

An electrochemical DNA nanobiosensor was prepared by immobilization of a 20mer thiolated probe on electro-deposited generation 4 (G4) poly(propyleneimine) dendrimer (PPI) doped with gold nanoparticles (AuNP) as platform, glassy carbon electrode (GCE). Field emission scanning electron microscopy results confirmed the codeposition PPI (which linked to surface C-N covalent bonds) and AuNP ca 60 nm. Voltammetric interrogations showed that platform (GCE/PPI-AuNP) conducting exhibited reversible...