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Electrochemical DNA Biosensors Based on Palladium Nanoparticles Combined with Carbon Nanotubes
Author(s) -
Chang Zhu,
Fan Hao,
Zhao Kun,
Chen Miao,
He Pingang,
Fang Yuzhi
Publication year - 2008
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200704023
Subject(s) - differential pulse voltammetry , biosensor , carbon nanotube , palladium , electrochemistry , detection limit , nafion , materials science , nanoparticle , methylene blue , glassy carbon , electrode , covalent bond , electrochemical gas sensor , cyclic voltammetry , nanotechnology , chemistry , catalysis , organic chemistry , chromatography , photocatalysis
Abstract 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 1.2×10 −13 M.