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Carbon Nanotubes Based Nanoelectrode Arrays: Fabrication, Evaluation, and Application in Voltammetric Analysis
Author(s) -
Tu Yi,
Lin Yuehe,
Yantasee Wassana,
Ren Zhifeng
Publication year - 2005
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.200403122
Subject(s) - carbon nanotube , cyclic voltammetry , horizontal scan rate , materials science , electrode , fabrication , passivation , electrochemistry , nanotechnology , voltammetry , graphene , capacitance , nanosensor , analytical chemistry (journal) , chemical engineering , layer (electronics) , chemistry , organic chemistry , medicine , alternative medicine , pathology , engineering
Fabrication, electrochemical characterization, and applications of low‐site density carbon nanotubes based nanoelectrode arrays (CNTs‐NEAs) are reported in this work. Spin‐coating of an epoxy resin provides a new way to create the electrode passivation layer effectively reducing electrode capacitance and current leakage. Cyclic voltammetry showed the sigmoidal shape curves with low capacitive current and scan‐rate‐independent limiting current. Square‐wave voltammetry showed well‐defined peak shapes in voltammograms of K 3 Fe(CN) 6 and 4‐acetamidophenol (acetaminophen) and the peak currents to be proportioned to their concentrations, demonstrating the feasibility for voltammetric analysis of the CNTs‐NEAs. The CNTs‐NEAs were also used successfully for voltammetric detection of trace concentrations of lead(II) at ppb level at first‐time. The CNTs‐NEAs provide an excellent platform for ultra sensitive electrochemical sensors for chemical and biological sensing.