Enhanced sensitivity in non-enzymatic glucose detection by improved growth kinetics of Ni based nanostructures.

5 years ago

Enhanced sensitivity in non-enzymatic glucose detection by improved growth kinetics of Ni based nanostructures.

Elena Bruno, Francesco Priolo, Salvatore Salvo Mirabella, Vincenzina Strano, Mario Urso, Giovanna Pellegrino

Ni based nanostructures are attractive catalytic materials for many electrochemical applications among which non-enzymatic sensing, charge storage, water splitting. In this work, we clarify the synthesis kinetics of Ni(OH)<sub>2</sub>/NiOOH nanowalls grown by chemical bath deposition at room temperature and at 50 °C, and then we applied the results to non-enzymatic glucose sensing reaching the utmost sensitivity of 31 mA/(cm<sup>2</sup>mM). Using scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis and Rutherford backscattering spectrometry (RBS) we found that the growth occurs through two regimes: first, a quick random growth leading to disordered sheets of Ni oxy-hydroxide, followed by a slower growth of well-aligned sheets of Ni hydroxide. High growth temperature (50 °C), leading mainly to well-aligned sheets, offers superior electrochemical properties in terms of charge storage, charge carrier transport and catalytic action, as confirmed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analyses. These reported results on the optimization and application of low-cost synthesis of this Ni based nanostructures have a large potential for application in catalysis, (bio)sensing, supercapacitors areas.

Publisher URL: http://doi.org/10.1088/1361-6528/aaacb6

DOI: 10.1088/1361-6528/aaacb6