Journal
ELECTROANALYSIS
Volume 20, Issue 2, Pages 131-136Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200704023
Keywords
carbon nanotubes; palladium nanoparticles; methylene blue; electrochemical biosensor; DNA hybridization
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Palladium nanoparticles, in combination with multi-walled carbon nanotubes (MWCNTs), were used to fabricate a sensitivity-enhanced electrochemical DNA biosensor. MWCNTs and palladium nanoparticles were dispersed in Nafion, which were used to modify a glassy carbon electrode (GCE). Oligonucleotides with amino groups at the 5' end were covalently linked onto carboxylic groups of MWCNTs on the electrode. The hybridization events were monitored by differential pulse voltammetry (DPV) measurement using methylene blue (MB) as an indicator. Due to the ability of carbon nanotubes to promote electron-transfer and the high catalytic activities of palladium nanoparticles for electrochemical reaction of MB, the sensitivity of presented electrochemical DNA biosensors was remarkably improved. The detection limit of the method for target DNA was 1.2 x 10(-13) M.
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