A highly sensitive non-enzymatic glucose electrode based on truncated octahedral CuO-modified Cu2O@Cu composite
A high-sensitivity non-enzymatic glucose electrode based on trucated octahedral CuO-modified Cu2O@Cu composite was fabricated by a simple hydrothermal method combined with a two-step liquid-phase reduction process and tested using artificial sweat samples. [Display omitted] •CuO/Cu2O@Cu composite wa...
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Published in | Microchemical journal Vol. 205; p. 111221 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.10.2024
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Subjects | |
Online Access | Get full text |
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Summary: | A high-sensitivity non-enzymatic glucose electrode based on trucated octahedral CuO-modified Cu2O@Cu composite was fabricated by a simple hydrothermal method combined with a two-step liquid-phase reduction process and tested using artificial sweat samples.
[Display omitted]
•CuO/Cu2O@Cu composite was made by a simple hydrothermal method combined with a two-step liquid-phase reduction process.•The synergistic effect of CuO/Cu2O@Cu ternary composites enhances the ability of electrocatalytic oxidation of glucose.•The detection effect is excellent in artificial sweat samples.
A highly sensitive non-enzymatic glucose electrode based on truncated octahedral CuO-modified Cu2O@Cu composite was fabricated by a simple hydrothermal method combined with a two-step liquid-phase reduction process. Research on utilizing nanostructures to increase the contact opportunities between electroactive materials and target analytes, thereby enhancing electrocatalytic activity, is currently insufficient. In this study, we employed a reduction method to create a core–shell structure with copper shells encapsulating internal nanomaterials. This structure was designed to provide more active sites for glucose molecules, thereby enhancing the electrocatalytic response current of glucose. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the morphology and components of the products obtained from each step, while the CuO/Cu2O@Cu ternary composites were specifically analyzed using transmission electron microscopy (TEM). For glucose detection, CuO/Cu2O@Cu composite was modified onto a glassy carbon electrode (GCE) as a working electrode for electrochemical performance testing. The cyclic voltammetry (CV) test results indicate that the CuO/Cu2O@Cu-GCE electrode exhibits a sensitivity of 771 μA cm−2 mM−1 within the glucose concentration range of 0 to 10 mM, with a detection limit of 3.39 μM. Chronoamperometry (CA) results demonstrate that the electrode achieves a sensitivity of 1067 μA cm−2 mM−1 in the glucose concentration range of 0 to 1 mM, with a detection limit of 0.56 μM. Exhibiting a broad linear response range, high sensitivity, minimal detection limit, and robust selectivity against common interferents, the electrode maintained 99 % stability over four days and retained more than 85 % of its current response for two weeks, also showing notable sensitivity in artificial sweat samples. Owing to its simple fabrication, cost-effectiveness, and outstanding electrochemical properties, the CuO/Cu2O@Cu composite offers significant potential for application in non-enzymatic glucose sensing. |
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ISSN: | 0026-265X |
DOI: | 10.1016/j.microc.2024.111221 |