Search

Abstract Bimetallic nanoporous alloys have attracted considerable attention for electrochemical sensor applications due to their excellent electrocatalytic activity and structural stability. In the present work, nanoporous PtFe (NP-PtFe) alloy was fabricated by chemical dealloying ternary PtFeAl alloy ribbons. The structure and morphology of NP-PtFe alloy was characterized by scanning electronmicroscopy, transmission electron microscopy and X-ray diffraction. A highly sensitive and selective biosensor based on NP-PtFe alloy and graphene was successfully developed for direct detection of bisphenol A. Under optimal conditions, the proposed sensor showed an efficient electrocatalytic activity towards the redox of bisphenol A. Differential pulse voltammetry was applied to the electrochemical determination of bisphenol A with a wide linear concentration range from 0.2 μM to 96 μM and a low limit of detection of 0.17 μM (S/N = 3). This strategy provides a novel and simple approach for sensitive and selective detection of bisphenol A, holding promising applications in the determination of organic pollution in real water samples. [ABSTRACT FROM AUTHOR]

Three-dimensional nanoporous copper (NP-Cu) for the first time has been used as an enhanced material for ultrasensitive detection of carbendazim by electrochemistry method. The NP-Cu was fabricated by dealloying Al Cu alloy ribbons, which was characterized by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The NP-Cu shows bicontinuous nanoporous structure with ligaments of ~20 nm. Based on the large specific surface area and high electrocatalytic activity, the NP-Cu was used to develop an amperometric sensor for carbendazim detection. Sensing parameters such as accumulation time, suspension volume, pH, scan rate, and concentration of carbendazim were discussed. The sensor can be applied to quantification of carbendazim in the concentration range of 0.5–30 μM (R2 = 0.998), with a detection limit of 0.09 μM (S/N = 3). Moreover, the sensor showed good stability, high selectivity, and satisfactory anti-interference ability. The proposed approach was approvingly applied to electrochemical determination of carbendazim in practical sample. • Electrochemical carbendazim sensor using three-dimensional nanoporous Cu/graphene composite • The sensor exhibits low detection limit, wide linear range, high sensitivity and stability. • The sensor was successfully applied to the analysis of carbendazim in pond water. [ABSTRACT FROM AUTHOR]