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Enzyme-free glucose biosensor based on low density CNT forest grown directly on a Si/SiO<inf>2</inf> substrate

Zhu, ZG and Garcia-Gancedo, L and Chen, C and Zhu, XR and Xie, HQ and Flewitt, AJ and Milne, WI (2013) Enzyme-free glucose biosensor based on low density CNT forest grown directly on a Si/SiO<inf>2</inf> substrate. Sensors and Actuators, B: Chemical, 178. pp. 586-592. ISSN 0925-4005

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Abstract

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. © 2013 Elsevier B.V.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:59
Last Modified: 05 Oct 2017 02:22
DOI: