Flexible Polyester Screen‐printed Electrode Modified with Carbon Nanofibers for the Electrochemical Aptasensing of Cadmium (II)
Colani T. Fakude, Omotayo A. Arotiba, Fabiana Arduini, Nonhlangabezo Mabuba
Abstract
Abstract An aptasensor was prepared by immobilising a biotinylated aptamer selected for Cd(II) on an activated carbon nanofiber (CNF) and streptavidin modified a screen‐printed electrode. The acid activated CNF was characterised by FTIR, CHNS elemental analysis and electron microscopy. Cyclic voltammetry, square wave voltammetry and electrochemical impedance spectroscopy (EIS) were used to characterise each step in the aptasensor preparation electrochemically. A detection limit of 0.11 ppb and a linear range of 2–100 ppb were obtained for Cd(II) with tolerance for other interfering species. The aptasensor was applied in real water samples and validated with ICPOES.
Topics & Concepts
Cyclic voltammetryDetection limitCarbon nanofiberElectrodeDielectric spectroscopyElectrochemistryMaterials sciencePolyesterLinear rangeNuclear chemistryChemistryNanotechnologyChromatographyCarbon nanotubeComposite materialPhysical chemistryAdvanced biosensing and bioanalysis techniquesElectrochemical Analysis and ApplicationsElectrochemical sensors and biosensors