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Fabrication and Application of a Novel Modified Electrode Based on Multiwalled Nanotubes/Cerium(III) 12‐Tungstophosphoric Acid Nanocomposite
Author(s) -
Fang Bin,
Chen Daolei,
Huang Qiang,
Wei Yan,
Wang Guangfeng
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.200704171
Subject(s) - cerium , nanocomposite , electrode , guanine , materials science , electrochemistry , cyclic voltammetry , dielectric spectroscopy , carbon nanotube , detection limit , inorganic chemistry , nuclear chemistry , chemical engineering , nanotechnology , chemistry , chromatography , nucleotide , biochemistry , engineering , metallurgy , gene
A novel multiwalled nanotubes (MWNTs)/Cerium(III) 12 ‐ tungstophosphoric acid (CePW) nanocomposite film glassy carbon electrode was prepared in this paper. Electrochemical behaviors of the CePW/MWNTs modified electrode were investigated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). This modified electrode brought new capabilities for electrochemical devices by combining the advantages of carbon nanotubes, rare‐earth, and heteropoly‐acids. The results demonstrated that the CePW/MWNTs modified electrode exhibited enhanced electrocatalytic behavior and good stability for the detection of guanine and adenine in 0.1 M PBS (pH 7.0). The experimental parameters were optimized and a direct electrochemical method for the simultaneous determination of guanine and adenine was proposed. The detection limit ( S / N =3) for guanine and adenine was 2.0×10 −8 M and 3.0×10 −8 M, respectively. Further, the acid‐denatured calf thymus DNA was also detected and the result was satisfied.