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Carbon Nanotubes/Poly(1,2‐diaminobenzene) Nanoporous Composite Film Electrode Prepared by Multipulse Potentiostatic Electropolymerisation and Its Application to Determination of Trace Heavy Metal Ions
Author(s) -
Gao Xiaohua,
Wei Wanzhi,
Yang Liu,
Guo Manli
Publication year - 2006
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.200503409
Subject(s) - nanoporous , materials science , electrode , dielectric spectroscopy , cyclic voltammetry , carbon nanotube , composite number , electrochemistry , chemical engineering , detection limit , analytical chemistry (journal) , nanotechnology , composite material , chemistry , chromatography , engineering
A novel method for the fabrication of carbon nanotubes/poly(1,2‐diaminobenzene) nanoporous composite based electrode was proposed. By multipulse potentiostatic electropolymerization, the multi‐walled carbon nanotubes (MWNTs) and poly(1,2‐diaminobenzene) were deposited simultaneously on the electrode surface. Compared with the composite prepared by the traditional potentiodynamic method, the composite synthesized by multipulse potentiostatic method has a unique nanoporous structure, exhibits excellent conductivity and better environmental stability. The surface of the resulting electrode was characterized with scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The nanoporous composite film modified glassy carbon electrode was also used successfully for the simultaneously voltammetric determination of trace level of Cd 2+ and Cu 2+ at first‐time. Under the optimal conditions, the determination limits of 0.25 and 0.33 ppb for Cd 2+ and Cu 2+ were obtained, respectively. The calibration graphs were linear in the concentration range of 5–100 ppb. The electrode system provides an excellent platform for ultra sensitive electrochemical sensors for chemical and biological sensing.