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A novel Ni nanofoam electrode has been fabricated by low-cost methods and applied for non-enzymatic glucose sensing. Ni(OH)2 nanowalls, prepared by room-temperature chemical bath deposition, were transformed into an ensemble of Ni nanoparticles (20–30 nm in size) upon annealing in forming gas at 350 °C, and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), temperature programmed reduction with hydrogen (H2-TPR) and surface area measurements. The Ni nanofoam was converted to the catalytic Ni(OH)2/NiOOH – necessary for non-enzymatic glucose oxidation – by cyclic voltammetry (CV) in NaOH electrolyte. The electrode fabricated on conducting glass substrate showed a glucose sensitivity of 2.37 mA/cm2 mM, a linear range of 0.01–0.7 mM, a limit of detection (LOD) of 5 μM, a fast response time (1 s), and resistance to chloride poisoning. The glucose sensor also …
Publication date: 
1 Mar 2016

Kingsley O Iwu, Agata Lombardo, Ruy Sanz, Salvatore Scirè, Salvo Mirabella

Biblio References: 
Volume: 224 Pages: 764-771
Sensors and Actuators B: Chemical