Abstract
An innovative electrochemical sensor is introduced that utilizes bipolar electrochemistry on a paper substrate for detecting glucose in sweat. The sensor employs a three-dimensional porous nanocomposite (MXene/NiSm-LDH) formed by decorating nickel-samarium nanoparticles with double-layer MXene hydroxide. These specially designed electrodes exhibit exceptional electrocatalytic activity during glucose oxidation. The glucose sensing mechanism involves enzyme-free oxidation of the analyte within the sensor cell, achieved by applying an appropriate potential. This leads to the reduction of K3Fe(CN)6 in the reporter cell, and the resulting current serves as the response signal. By optimizing various parameters, the measurement platform enables the accurate determination of sweat glucose concentrations within a linear range of 10 to 200 µM. The limit of detection (LOD) for glucose is 3.6 µM (S/N = 3), indicating a sensitive and reliable detection capability. Real samples were analysed to validate the sensor’s efficiency, and the results obtained were both promising and encouraging.
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The authors are grateful to the University of Tehran for the financial support of this work.
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Zahra Damirchi: formal analysis, visualization, data curation, writing—original draft and review and editing; Ali Firoozbakhtian: conceptualization, methodology, designing the analysis, writing—review and editing; Morteza Hosseini: conceptualization, methodology, project administration, funding acquisition, writing—review and editing; Mohammad Reza Ganjali: project administration, writing—review and editing.
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Damirchi, Z., Firoozbakhtian, A., Hosseini, M. et al. Ti3C2/Ni/Sm-based electrochemical glucose sensor for sweat analysis using bipolar electrochemistry. Microchim Acta 191, 137 (2024). https://doi.org/10.1007/s00604-024-06209-3
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DOI: https://doi.org/10.1007/s00604-024-06209-3