Ultralong aligned multi-walled carbon nanotube for electrochemical sensing
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Publication Details
Author list: Punbusayakul N., Ci L., Talapatra S., Surareungchai W., Ajayan P.M.
Publisher: American Scientific Publishers
Publication year: 2008
Journal: Journal of Nanoscience and Nanotechnology (1533-4880)
Volume number: 8
Issue number: 4
Start page: 2085
End page: 2090
Number of pages: 6
ISSN: 1533-4880
eISSN: 1533-4899
Languages: English-Great Britain (EN-GB)
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Abstract
We have investigated electrochemical sensing properties of electrodes fabricated with ultralong aligned multi-walled carbon nanotube (MWNT) bundles synthesized using water-assisted chemical vapor deposition on aluminum (Al) and iron (Fe) coated silicon wafer with ethylene and argon/hydrogen gas as carbon source and buffer gas respectively. Cyclic voltammograms performed on these electrodes show dlffusion-controlled-reversible reaction. The dominance of radial diffusion mass transport at these electrodes was also indicated by sigmoidal-shaped voltammograms obtained at various scan rates. These electrodes were able to sense very low concentration of ascorbic acid (∼0.7 μM) and dopamine (∼1.87 μM), two model species often used in electroanalysis. The excellent electrochemical properties along with good single species detection ability suggest that these MWNTs are promising electrode materials for developing very sensitive chemical and/or biological sensors. Copyright © 2008 American Scientific Publishers All rights reserved.
Keywords
Electrochemical sensing, Multi-walled carbon nanotubes
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