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Electrocatalytic Oxidation of Norepinephrine at a Glassy Carbon Electrode Modified with Single Wall Carbon Nanotubes
Author(s) -
Wang Jianxiu,
Li Meixian,
Shi Zujin,
Li Nanqiang,
Gu Zhennan
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200202)14:3<225::aid-elan225>3.0.co;2-i
Subject(s) - ascorbic acid , carbon nanotube , electrode , glassy carbon , redox , electrochemistry , materials science , scanning electron microscope , electrocatalyst , diffusion , analytical chemistry (journal) , carbon fibers , inorganic chemistry , chemistry , chemical engineering , cyclic voltammetry , nanotechnology , organic chemistry , composite material , composite number , physics , food science , thermodynamics , engineering
The voltammetric behavior of norepinephrine (NE) was studied at a glassy carbon (GC) electrode modified with single wall carbon nanotubes (SWNTs). In pH 5.72 B‐R buffer solution, the SWNT‐modified electrode shows high electrocatalytic activity toward NE oxidation. One well‐defined reversible redox couple is obtained at scan rates lower than 0.15 V s −1 . The peak current increases linearly with the concentration of NE in the range of 1.0×10 −5 ‐ 1.1×10 −3 mol dm −3 . The detection limit is 6.0×10 −6 mol dm −3 and the diffusion coefficient ( D ) of NE is 8.53×10 −6 cm 2 s −1 . The SWNT was characterized with scanning electron microscope (SEM). Furthermore, the SWNT‐modified electrode has favorable electrocatalytic activity with dopamine, epinephrine, and ascorbic acid.