期刊
ACS NANO
卷 14, 期 5, 页码 5543-5552出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b09778
关键词
nanoglass; nonenzymatic glucose sensor; nickel-niobium alloy; cyclic voltammetry; electrochemistry
类别
资金
- Karlsruhe Institute of Technology
- Deutsche Forschungsgemeinschaft [HA 1344/30-2]
- University Grants Commission (UGC), India
- Department of Science and Technology (DST), India
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 (Ni60Nb40) amorphous alloys in alkaline medium. Three different Ni60Nb40 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(-2) mM(-1)), 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.
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