Bag Soumabha, Baksi Ananya, Nandam Sree Harsha, Wang Di, Ye Xinglong, Ghosh Jyotirmoy, Pradeep Thalappil, Hahn Horst
Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany.
Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany.
ACS Nano. 2020 May 26;14(5):5543-5552. doi: 10.1021/acsnano.9b09778. Epub 2020 Apr 13.
Despite being researched for nearly five decades, chemical application of metallic glass is scarcely explored. Here we show electrochemical nonenzymatic glucose-sensing ability of nickel-niobium (NiNb) amorphous alloys in alkaline medium. Three different NiNb systems with the same elemental composition, but varying microstructures are created following different synthetic routes and tested for their glucose-sensing performance. Among melt-spun ribbon, nanoglass, and amorphous-crystalline nanocomposite materials, nanoglass showed the best performance in terms of high anodic current density, sensitivity (20 mA cm mM), limit of detection (100 nM glucose), stability, reproducibility (above 5000 cycles), and sensing accuracy among nonenzymatic glucose sensors involving amorphous alloys. When annealed under vacuum, only the heat-treated nanoglass retained a similar electrochemical-sensing property, while the other materials failed to yield desired results. In nanoglass, a network of glassy interfaces, compared to melt-spun ribbon, is plausibly responsible for the enhanced sensitivity.
尽管金属玻璃的化学应用已研究了近五十年，但仍几乎未被探索。在此，我们展示了镍铌（NiNb）非晶合金在碱性介质中的电化学非酶葡萄糖传感能力。通过不同的合成路线制备了三种具有相同元素组成但微观结构不同的NiNb体系，并测试了它们的葡萄糖传感性能。在熔纺带材、纳米玻璃和非晶-晶体纳米复合材料中，纳米玻璃在高阳极电流密度、灵敏度（20 mA cm mM）、检测限（100 nM葡萄糖）、稳定性、重现性（超过5000次循环）以及涉及非晶合金的非酶葡萄糖传感器中的传感准确性方面表现最佳。在真空下退火时，只有热处理后的纳米玻璃保留了类似的电化学传感特性，而其他材料未能产生预期结果。与熔纺带材相比，纳米玻璃中的玻璃态界面网络可能是灵敏度提高的原因。
