Journal
BIOSENSORS & BIOELECTRONICS
Volume 25, Issue 10, Pages 2194-2199Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2010.02.027
Keywords
Carbon nanohorns; Carbon nanotubes; Noncovalent functionalization; Biosensors; Heme proteins
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Funding
- National Natural Science Foundation of China [20875086, 20505016]
- Department of Sciences and Technology of Jilin Province [20070108, 20082104]
- Ministry of Science and Technology of the People's Republic of China [2006BAE03B08]
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Single-walled carbon nanohorns (SWNHs), distinguished by their high purity and distinct structure, were noncovalently functionalized with poly(sodium 4-styrenesulfonate). The functionalized SWNHs were characterized by scanning electron microscopy, atomic force microscopy, ultraviolet-visible spectroscopy. Fourier transform infrared spectroscopy, Raman spectroscopy, and thermogravimetry. Heme protein myoglobin was adsorbed onto surface of functionalized SWNHs to prepare electrochemical biosensor. Surface assembly process and direct electrochemistry of immobilized myoglobin were investigated by electrochemical impedance spectroscopy and cyclic voltammetry, respectively. The proposed biosensor exhibited good electrocatalysis to the reduction of hydrogen peroxide. The response was linear over the range 3-350 mu M with a detection limit of 0.5 mu M. Good reproducibility and stability of the biosensor were obtained toward hydrogen peroxide detection. (C) 2010 Elsevier B.V. All rights reserved.
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