Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 47, Pages 20169-20172Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp901894j
Keywords
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Funding
- National Basic Research Program of China (973 Program) [2006CB933000, 2007CB936000]
- National Natural Science Foundation of China [50825304]
- National High-tech R&D Program of China (863 Program) [2007AA03Z300]
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Highly oriented single-crystal ZnO nanotube (ZNT) arrays were prepared by a two-step electrochemical/chemical process on indium-doped tin oxide (ITO) coated glass in an aqueous solution. The prepared ZNT arrays were further used as a working electrode to fabricate an enzyme-based glucose biosensor through immobilizing glucose oxiduse in conjunction with a Nafion coating. The present ZNT arrays-based biosensor exhibits high sensitivity of 30.85 mu A cm(-2) in M-1 at an applied potential of +0.8 V vs. SCE, wide linear calibration ranges from 10 mu M to 4.2 mM, and a low limit of detection (LOD) at 10 mu M (measured) for sensing of glucose. The apparent Michaelis-Menten constant K-M(app) was calculated to be 2.59 mM, indicating a higher bioactivity for the biosensor.
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