Abstract
A highly sensitive non-enzymatic glucose sensor was fabricated by hybridizing 0- dimensional (0D) Ag nanoparticles, 3D flower-like nickel oxide (NiO) nanostructures, and 2D reduced graphene oxide (rGO) as the sensing interface by hydrothermal synthesis. The resulting hybrid structures were characterized by Raman spectroscopy, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, and high-resolution transmission electron microscopy. The Ag/NiO/rGO fabricated in this study showed high electrochemical activity towards the oxidation of glucose in a 0.1 M NaOH solution. At an applied potential of +0.6 V, it exhibited a rapid response time (<4 s), a broad linear range of glucose concentrations up 25 mM with an extraordinarily high sensitivity of 1869.4 μA mM−1 cm−2. The detection limit was as low as 2.44 μM. In addition, the response towards common interfering species, such as sucrose, lactose, fructose, ascorbic acid, dopamine, and uric acid were low enough to be avoidable.
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