Amperometric glucose sensor based on the Ni(OH)2/Al(OH)4- electrode obtained from a thin Ni3Al foil

In this report, we present a facile and relatively fast method to roughen the surface of Ni3Al-based inter metallic foil, and test it as an amperometric non-enzymatic glucose sensor. The alloy samples underwent chemical etching in a H3PO4:CH3COOH(HAc):HNO3:H2O(24:1:1:7 in volume) solution in order to achieve a high surface area with more electroactive sites. The Ni(OH)(2)/Al(OH)(4)(-) electrode was fabricated using potential cycling technique in a highly concentrated alkaline solution. The electrodes were tested electrochemically for oxidation of glucose. We have demonstrated that Ni(OH)(2)/Al(OH)(4)(-) electrodes exhibit high sensitivity towards glucose detection (796 mu AmM(-1)cm(-2)) and short response time (3 s) upon successive addition of glucose. Moreover, as for a non-nanometric material, prepared electrodes show a relatively good linear correlation between current density and glucose concentration (0.025-0.45 mM) and limit of detection (47.6 mu M). For more in-depth characterization of presented material, electrodes were examined using scanning electron microscopy (SEM) with energy -dispersive spectroscopy (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). (C) 2017 Elsevier B.V. All rights reserved.