Abstract
Co(OH)2 nanoflakes integrating with Cu nanoparticles were deposited on nickel foam (CuNps-Co(OH)2Nfs/Nif) by a green and facile one-step deposition method and used for non-enzymatic glucose sensors. The CuNps-Co(OH)2Nfs/Nif composite was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and high resolution transmission electron microscopy. Electrochemical oxidation of glucose on the CuNps-Co(OH)2Nfs/Nif composite was investigated by chronoamperometry and cyclic voltammetry. The prepared CuNps-Co(OH)2Nfs/Nif electrode shows not only an extremely high sensitivity of 42.7 mA mM−1 cm−2 in the concentration range from 1 to 250 μM for glucose detection but also an obvious current response to glucose at a level of 1 μM with a low detection limit of 73 nM (S/N = 3). Moreover, the glucose sensor based on CuNps-Co(OH)2Nfs/Nif also exhibits high recovery ratio toward real sample analysis. This work indicates that the fast electron transfer, large surface area, and highly effective active sites based on the hierarchical structure of ultra-thin and open-interlaced Co(OH)2Nfs interspersed by CuNps contribute to the excellent performance of CuNps-Co(OH)2Nfs/Nif electrodes. The proposed one-step preparation of hierarchical nanostructure of CuNps and Co(OH)2Nfs provides a promising and efficient strategy in the development of outstanding non-enzymatic glucose biosensors.
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