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The flexible, free-standing and durable highly rough NiS/rGO composite paper electrode was prepared with a simple electrochemical deposition of NiS structures on the surface of the rGO paper electrode. NiS/rGO composite paper electrode was characterized by using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Xray diffraction (XRD), Raman spectroscopy and electrochemical impedance spectroscopy (EIS) techniques. Asprepared NiS/rGO composite paper was used for the electrochemical detection of ascorbic acid (AA). The rough and the ball-like NiS nanostructures on the rGO paper electrode surface greatly increased the catalytic performance of the paper electrode by providing a large active surface area. AA was detected on NiS/rGO composite paper with a wide linear range from 1.0 to 800 μM, a low detection limit of 0.7 μM (S/N=3) and a high sensitivity. Besides, the electrochemical tests showed that the composite paper electrode is very stable, flexible and durable at the atmospheric conditions. [ABSTRACT FROM AUTHOR]

In this study, free-standing MnO2 coated reduced graphene oxide (MnO2/rGO) paper with high flexibility and durability was prepared. As-prepared MnO2/rGO paper was characterized by scanning electron microscopy-energy-dispersive Xray spectroscopy (SEM-EDS), X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The electrochemical behavior of dopamine (DA) was investigated on flexible MnO2/rGO paper with cyclic voltammetry and amperometry methods. Electrochemical results have shown that the flexible MnO2/rGO paper electrode exhibits excellent electrocatalytic activity to DA due to its high specific surface area. In addition, the obtained flexible electrochemical sensor showed a wide linear range, a low detection limit and a very sensitive response for the amperometric determination of DA. [ABSTRACT FROM AUTHOR]

In this study; a flexible, self-contained and durable PtCu/reduced graphene oxide (iGrO) hybrid paper was synthesized and used for the electrochemical detection of p-nitrophenol (PNP). PtCu/iGrO hybrid paper was fabricated through electrodeposition of PtCu composite structure on iGrO paper electrode. The obtained PtCu/iGrO hybrid paper was characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, electrochemical impedance spectroscopy. The morphological analysis of PtCu/iGrO hybrid paper showed that flower-like nanostructures formed on the iGrO electrode surface consist of numerous sharp-edged nano layer of PtCu. PtCu/iGrO hybrid paper electrode demonstrated high electrocatalytic performance compared to iGrO paper and exhibited a wide linear range (0.08-760 μM) and a low detection limit (0.022 μM) for the determination of PNP. The PtCu/iGrO hybrid paper sensor also showed high recovery values for PNP detection in tap water. The hybrid paper sensor prepared with a practical and easy-to-apply method exhibited mechanically flexible and durable properties. Moreover, stability tests of PtCu/iGrO paper displayed that this hybrid electrode is an important candidate for high-performance flexible sensor applications. [ABSTRACT FROM AUTHOR]