Journal
TALANTA
Volume 80, Issue 5, Pages 2016-2022Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2009.11.010
Keywords
Amperometric; Vibrating sample magnetometer; Bioelectrode; CNTs; Biosensor
Categories
Funding
- AOARD
- Indian Institute of Technology Madras (IITM)
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A new type of amperometric glucose biosensor based on silicon dioxide coated magnetic nanoparticle decorated multiwalled carbon nanotubes (Fe3O4@SiO2/MWNTs) on a glassy carbon electrode (GCE) has been developed MWNTs have been synthesized by catalytic chemical vapour decomposition (CCVD) of acetylene over rare earth (RE) based AB(3) alloy hydride catalyst. The as-grown MWNTs have been purified and further functionlized Functionalized MWNTs have been decorated with magnetic Fe3O4 nanoparticles which have been uniformly coated with biocompatible SiO2 using a simple chemical reduction method The characterization of magnetic nanoparticle modified MWNTs have been clone by X-ray diffraction (XRD). Fourier transform infra red spectroscopy (FT-IR), scanning electron microscope (SEM), transmission electron microscope (TEM), vibrating sample magnetometer (VSM), energy dispersive X-ray analysis (EDX) and UV-vis spectroscopy Amperometric biosensor has been fabricated by the deposition of glucose oxidase (GOD) over Nafion-solubilizecl Fe3O4@SiO2/MWNTs electrode. The resultant bioelectrode retains its blocatalytic activity and offers fast and sensitive glucose quantification. The performance of the biosensor has been studied using cyclic voltammetry and amperometry and the results have been discussed. The fabricated glucose biosensor exhibits a linear response from 1 mu M to 30 mM with an excellent detection limit of 800 nM indicating the potential applications in food industries (C) 2009 Elsevier B V. All rights reserved.
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