Enzyme-free glucose biosensor based on low density CNT forest grown directly on a Si/SiO2 substrate
| Autor: | Andrew J. Flewitt, X.R. Zhu, W. I. Milne, Huaqing Xie, Zhigang Zhu, Cheng Chen, Luis Garcia-Gancedo |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Nanocomposite Scanning electron microscope Metals and Alloys Analytical chemistry Energy-dispersive X-ray spectroscopy Substrate (chemistry) 02 engineering and technology Chronoamperometry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Ascorbic acid 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Materials Chemistry Electrical and Electronic Engineering Cyclic voltammetry 0210 nano-technology Instrumentation Biosensor |
| Zdroj: | Sensors and Actuators B: Chemical. 178:586-592 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2012.12.112 |
| Popis: | A highly sensitive nonenzymatic amperometric glucose sensor was fabricated by using Ni nanoparticles homogeneously dispersed within and on the top of a vertically aligned CNT forest (CNT/Ni nanocomposite sensor), which was directly grown on a Si/SiO 2 substrate. The surface morphology and elemental analysis were characterized using scanning electron microscopy and energy dispersive spectroscopy, respectively. Cyclic voltammetry and chronoamperometry were used to evaluate the catalytic activities of CNT/Ni electrode. The CNT/Ni nanocomposite sensor exhibited a great enhancement of anodic peak current after adding 5 mM glucose in alkaline solution. The sensor can also be applied to the quantification of glucose content with a linear range covering from 5 μM to 7 mM, a high sensitivity of 1433 μA mM −1 cm −2 , and a low detection limit of 2 μM. The CNT/Ni nanocomposite sensor exhibits good reproducibility and long-term stability, moreover, it was also relatively insensitive to commonly interfering species, such as uric acid, ascorbic acid, acetaminophen, sucrose and d -fructose. |
| Databáze: | OpenAIRE |
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