Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 11, Issue 10, Pages 1861-1864Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2009.08.003
Keywords
Prussian blue; Nanotubes; Potassium; Ion-selective electrode; Membrane; Sensor
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Funding
- MOE Tier 1 Research Fund [R143-000-305-112]
- NUS for graduate research scholarship
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A model K+ sensor using Prussian blue nanotubes is fabricated by electrochemical deposition of Prussian blue (PB) within the nanochannels of a porous metal-coated membrane with partially covered pore openings. The PB nanotube sensor exhibits excellent stability giving reproducible peak potentials up to 500 measurement cycles, a very low detection limit of 2.0 x 10(-8) M and extremely wide logarithmic linear ranges between 5.0 x 10(-8)-7.0 x 10(-4) M and 7.0 x 10(-4)-1.0 M. Negligible interferences by Na+, Mg+ and Ca2+ are observed and a rapid analysis time of 30 s is readily achieved. The ease of electrodeposition, high stability of PB nanotubes and outstanding analytical performance which surpasses conventional PB voltammetric and potentiometric sensors demonstrates potential sensing applications including ion sensors and biosensors using PB and other metal hexacyanoferrate nanotubes. (C) 2009 Elsevier B.V. All rights reserved.
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