Journal
ELECTROANALYSIS
Volume 21, Issue 1, Pages 48-51Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200804394
Keywords
Multiwalled carbon nanotubes; Single-walled carbon nanotubes; Metallic impurities; Electroanalysis; Glucose sensing
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Funding
- Estonian Science Foundation [GFKFE6714, GFKFE6651]
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It is well established that the heterogeneity of carbon nanotubes must be determined before the origin of the electrochemical performance can be attributed. Recently it has been diligently reported that for the case of multiwalled carbon nanotube modified electrodes, copper oxide impurities are responsible for the electrochemical activity facilitating a nonenzymatic sensing strategy towards glucose. We have explored both commercially available multiwalled and single-walled carbon nanotubes for the sensing of glucose and find that iron oxide impurities remaining from the fabrication process are the electroactive sites facilitating the nonenzymatic detection of glucose. Given that the multiwalled carbon nanotubes in this work are purchased from the same leading supplier as that used recently, discrepancies in the fabrication process exist which clearly has implications in the commercialization of electrochemical sensors based on multiwalled carbon nanotubes.
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