Institut National de la Recherche Scientifique (INRS), Énergie Matériaux Télécommunications (EMT), 1650, Boulevard Lionel-Boulet, Varennes, QC J3X 1P7, Canada.
Sensors (Basel). 2024 Sep 10;24(18):5864. doi: 10.3390/s24185864.
Nanorod structures exhibit a high surface-to-volume ratio, enhancing the accessibility of electrolyte ions to the electrode surface and providing an abundance of active sites for improved electrochemical sensing performance. In this study, tetragonal α-MnO with a large K-embedded tunnel structure, directly grown on microfibrous carbon paper to form densely packed nanorod arrays, is investigated as an electrocatalytic material for non-enzymatic glucose sensing. The MnO nanorods electrode demonstrates outstanding catalytic activity for glucose oxidation, showcasing a high sensitivity of 143.82 µA cm mM within the linear range from 0.01 to 15 mM, with a limit of detection (LOD) of 0.282 mM specifically for glucose molecules. Importantly, the MnO nanorods electrode exhibits excellent selectivity towards glucose over ascorbic acid and uric acid, which is crucial for accurate glucose detection in complex samples. For comparison, a gold electrode shows a lower sensitivity of 52.48 µA cm mM within a linear range from 1 to 10 mM. These findings underscore the superior performance of the MnO nanorods electrode in both sensitivity and selectivity, offering significant potential for advancing electrochemical sensors and bioanalytical techniques for glucose monitoring in physiological and clinical settings.
纳米棒结构具有高的比表面积，增强了电解质离子向电极表面的可及性，并提供了丰富的活性位点，从而改善了电化学传感性能。在这项研究中，具有大 K 嵌入隧道结构的四方α-MnO 直接生长在微纤维碳纤维纸上，形成致密的纳米棒阵列，被用作非酶葡萄糖传感的电催化材料。MnO 纳米棒电极对葡萄糖氧化表现出出色的催化活性，在 0.01 至 15 mM 的线性范围内表现出 143.82 µA cm mM 的高灵敏度，葡萄糖分子的检测限（LOD）为 0.282 mM。重要的是，MnO 纳米棒电极对葡萄糖具有出色的选择性，而对抗坏血酸和尿酸的选择性较低，这对于在复杂样品中进行准确的葡萄糖检测至关重要。相比之下，金电极在 1 至 10 mM 的线性范围内的灵敏度为 52.48 µA cm mM。这些发现突出了 MnO 纳米棒电极在灵敏度和选择性方面的卓越性能，为推进电化学传感器和生物分析技术在生理和临床环境中进行葡萄糖监测提供了重要的潜力。
