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Enzyme-free glucose biosensor based on low density CNT forest grown directly on a Si/SiO2 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/SiO2 substrate. Sensors and Actuators, B: Chemical, 178. pp. 586-592. ISSN 0925-4005

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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/SiO2 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
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Unnamed user with email
Date Deposited: 15 Dec 2015 13:06
Last Modified: 02 May 2016 00:46
DOI: 10.1016/j.snb.2012.12.112