Abstract
A facile hydrothermal route for the synthesis of ordered NiWO4 nanocrystals, which show promising applications as high performance non-enzymatic glucose sensor is reported. The NiWO4-modified electrodes showed excellent sensitivity (269.6 μA mM−1 cm−2) and low detection limit (0.18 μM) for detection of glucose with desirable selectivity, stability, and tolerance to interference, rendering their prospective applications as cost-effective, enzyme-free glucose sensors.
Highlights
The transmission electron microscope (TEM) images of the as-prepared NiWO4 material (Fig. 3) reveal crystals composing of aggregated nanoparticles with an average particle size of ca. 10–20 nm
The weight-loss at temperatures less than 100 °C is attributed to the desorption of water molecules, whereas, the notable weight-loss in the temperature range of 220–480 °C may be attributed to the decomposition of small amount of grafted metal hydroxides
Their structure and morphology were monitored by field-emission scanningelectron microscope (FE-scanning electron microscopy (SEM); JEOL JSM-6700F) and field emission-transmission electron microscopy (FE-TEM; JEOL JEM-2100F)
Summary
It is indicative that the NiWO4-modified electrode possesses a higher electrical conductivity and elelctron transfer rate, more suitable for the electrochemical detection of glucose. Upon introducing glucose (100 μM) onto the NiWO4-modified GCE, a notable increase in Ipa along with a decrease in Ipc was observed (curve c; Fig. 5B), which may be ascribed due to formation of gluconolactone through oxisation of glucose by NiOOH15: NiOOH + glucose → NiO + gluconolactone
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