Facile synthesis of Ni nanofoam for flexible and low-cost non-enzymatic glucose sensing
| Autor: | Kingsley O. Iwu, Ruy Sanz, Salvo Mirabella, Salvatore Scirè, Agata Lombardo |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Metals and Alloys Analytical chemistry Nanoparticle 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemical engineering Electrode Materials Chemistry Electrical and Electronic Engineering Cyclic voltammetry Temperature-programmed reduction 0210 nano-technology Forming gas Instrumentation Chemical bath deposition Nanofoam |
| Zdroj: | Sensors and Actuators B: Chemical. 224:764-771 |
| ISSN: | 0925-4005 |
| Popis: | A novel Ni nanofoam electrode has been fabricated by low-cost methods and applied for non-enzymatic glucose sensing. Ni(OH)2 nanowalls, prepared by room-temperature chemical bath deposition, were transformed into an ensemble of Ni nanoparticles (20–30 nm in size) upon annealing in forming gas at 350 °C, and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), temperature programmed reduction with hydrogen (H2-TPR) and surface area measurements. The Ni nanofoam was converted to the catalytic Ni(OH)2/NiOOH – necessary for non-enzymatic glucose oxidation – by cyclic voltammetry (CV) in NaOH electrolyte. The electrode fabricated on conducting glass substrate showed a glucose sensitivity of 2.37 mA/cm2 mM, a linear range of 0.01–0.7 mM, a limit of detection (LOD) of 5 μM, a fast response time (1 s), and resistance to chloride poisoning. The glucose sensor also exhibited an excellent long-term stability (4% decrease in sensitivity after 64 days) and selectivity in the presence of common interfering species. The versatility of the preparation method was demonstrated in the fabrication of a flexible (plastic substrate) sensor with a sensitivity of 1.43 mA/cm2 mM. The ease of fabrication and the excellent properties of Ni nanofoam in glucose sensing make it promising for low-cost and wearable sensing applications. |
| Databáze: | OpenAIRE |
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