Direct electrochemistry of uric acid at chemically assembled carboxylated single-walled carbon nanotubes netlike electrode

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Carboxylated single-walled carbon nanotubes (SWCNT) chemically assembled on gold substrate was employed as netlike electrode to investigate the charge-transfer process and electrode process kinetics using uric acid as an example. The electrochemical behavior of uric acid in carboxylated SWCNT system was investigated using cyclic voltammetry, chronoamperometry, and single potential time-based techniques. The properties of raw SWCNT electrode were also studied for comparison purpose. Uric acid has better electrochemical behavior whereas ascorbic acid has no effective reaction on the carboxylated SWCNT electrode. Cyclic voltammograms indicate that the assembled carboxylated SWCNT increases more active sites on electrode surface and slows down the electron transfer between the gold electrode and uric acid in solution. The charge-transfer coefficient (alpha) for uric acid and the rate constant (k) for the catalytic reaction were calculated as 0.52 and 0.43 s(-1), respectively. The diffusion coefficient of 0.5 mM uric acid was 7.5 x 10(-6) cm(2) center dot s(-1). The results indicate that electrode process in the carboxylated SWCNT electrode system is governed by the surface adsorption-controlled electrochemical process.
Publisher
AMER CHEMICAL SOC
Issue Date
2006-11
Language
English
Article Type
Article
Keywords

MODIFIED GOLD ELECTRODE; ASCORBIC-ACID; SELECTIVE DETERMINATION; VOLTAMMETRIC DETECTION; GRAPHITE-ELECTRODES; HUMAN SERUM; CHEMILUMINESCENCE; BIOSENSOR; SYSTEM; ENZYME

Citation

JOURNAL OF PHYSICAL CHEMISTRY B, v.110, no.43, pp.21850 - 21856

ISSN
1520-6106
DOI
10.1021/jp063749q
URI
http://hdl.handle.net/10203/14261
Appears in Collection
EE-Journal Papers(저널논문)
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