Journal
ANALYST
Volume 136, Issue 2, Pages 293-298Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0an00402b
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Funding
- NENU'S Scientific Innovation Project [NENU-STC08011]
- Science Foundation of Jilin Province [20090532]
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To improve the electrocatalytic activities of carbon nanotubes (CNT) towards the oxidation of nicotinamide adenine dinucleotide (NADH), we derive them with a redox mediator, 1,10-phenanthroline-5,6-dione (PD), by the noncovalent functionalization method. The redox carbon nanotubes (PD/CNT/GC) show excellent electrocatalytic activities towards the oxidation of NADH (catalytic reaction rate constant, k(h) - 7.26 x 10(3) M-1 s(-1)), so the determination of NADH can be achieved with a high sensitivity of 8.77 mu A mM(-1) under the potential of 0.0 V with minimal interference. We also develop an amperometric ethanol biosensor by integration of alcohol dehydrogenase (ADH) within the redox carbon nanotubes (PD/CNT/GC). The ethanol biosensor exhibits a wide linear range up to 7 mM with a lower detection limit of 0.30 mM as well as a high sensitivity of 10.85 nA mM(-1).
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