High performance glucose biosensor based on the immobilization of glucose oxidase onto modified titania nanotube arrays
We report on a high performance glucose biosensor based on the immobilization of glucose oxidase (GOx) with chitosan onto TiO 2 nanotube arrays modified by Prussian blue (PB) and Au. The titania nanotube arrays were grown directly on a Ti substrate using anodic oxidation, with a thin Au film coated...
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Published in | Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 627; no. 1; pp. 76 - 81 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Kidlington
Elsevier B.V
01.03.2009
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | We report on a high performance glucose biosensor based on the immobilization of glucose oxidase (GOx) with chitosan onto TiO
2 nanotube arrays modified by Prussian blue (PB) and Au. The titania nanotube arrays were grown directly on a Ti substrate using anodic oxidation, with a thin Au film coated onto the TiO
2 nanotube arrays by an argon plasma technique, followed by the electrodeposition of PB. The morphology and composition of the fabricated TiO
2 nanotube arrays were characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Cyclic voltammetry and amperometry were used to study and to optimize the performance of the resulting electrochemical biosensor. Applied potential, pH, and the effect of interferences have been systemically studied. Our results show that the modified TiO
2 nanotube arrays provide excellent matrices for the immobilization of GOx and that the proposed electrochemical biosensor exhibits a very low detection limit, high stability and very good reproducibility towards the detection of glucose. Under the optimized conditions, the biosensor exhibits a high sensitivity 36
μA
mM
−1 and very low detection limit of 5
μM. |
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ISSN: | 1572-6657 1873-2569 |
DOI: | 10.1016/j.jelechem.2008.12.022 |