Abstract
There is a major challenge to attach nanostructures on to the electrode surface while retaining their engineered morphology, high surface area, physiochemical features for promising sensing applications. In this study, we have grown vertically-aligned ZnO nanorods (NRs) on fluorine doped tin oxide (FTO) electrodes and decorated with CuO to achieve high-performance non-enzymatic glucose sensor. This unique CuO-ZnO NRs hybrid provides large surface area and an easy substrate penetrable structure facilitating enhanced electrochemical features towards glucose oxidation. As a result, fabricated electrodes exhibit high sensitivity (2961.7 μA mM−1 cm−2), linear range up to 8.45 mM, low limit of detection (0.40 μM), and short response time (<2 s), along with excellent reproducibility, repeatability, stability, selectivity, and applicability for glucose detection in human serum samples. Circumventing, the outstanding performance originating from CuO modified ZnO NRs acts as an efficient electrocatalyst for glucose detection and as well, provides new prospects to biomolecules detecting device fabrication.
Highlights
In different morphology with high crystallinity, good optical properties, excellent electrical characterstics[20, 21]
We have shown that vertically-grown ZnO nanostructures on electrode surface have immense capability to hold enzymes because of their nanostructure morphology and high surface area, thereby enhancing overall sensing performance of the enzymatic sensors[22,23,24]
CuO nanostructures have been well-studied as an efficient material for the fabrication of non-enzymatic glucose detection owing to the fact that they possess excellent electrochemical and catalytic properties, inexpensive, low temperature, and easy tuning of CuO nanostructures, exhibiting potential outcomes on the sensors sensitivity due to their high surface and volume ratio[29,30,31]
Summary
In different morphology with high crystallinity, good optical properties, excellent electrical characterstics[20, 21]. We have shown that vertically-grown ZnO nanostructures on electrode surface have immense capability to hold enzymes because of their nanostructure morphology and high surface area, thereby enhancing overall sensing performance of the enzymatic sensors[22,23,24]. CuO nanostructures have been well-studied as an efficient material for the fabrication of non-enzymatic glucose detection owing to the fact that they possess excellent electrochemical and catalytic properties, inexpensive, low temperature, and easy tuning of CuO nanostructures, exhibiting potential outcomes on the sensors sensitivity due to their high surface and volume ratio[29,30,31]. The non-enzymatic sensors were assessed for glucose detection in serum, illustrating its promising sensing applications in near-real/real time samples
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