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Facile Fabrication of Zirconia Modified Screen‐Printed Carbon Electrodes for Electrochemical Sensing of Phosphate
Author(s) -
Cheng WanLing,
Chang JenLin,
Su YaLing,
Zen JyhMyng
Publication year - 2013
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.201300387
Subject(s) - detection limit , cubic zirconia , electrode , ferricyanide , materials science , phosphate , electrochemistry , adsorption , linear range , carbon fibers , lithium iron phosphate , chemical engineering , nanotechnology , inorganic chemistry , chemistry , chromatography , composite material , organic chemistry , ceramic , composite number , engineering
We report here a facile method to immobilize zirconia nanoparticles on a disposable screen‐printed carbon electrode (designated as ZrO 2 ‐SPCE) for phosphate sensor application. Simply by ultrasonicating a bare SPCE in a ZrO 2 slurry, ZrO 2 nanoparticles can be immobilized effectively on the electrode surface as verified by surface characterization evidences. Using ferricyanide as a redox probe, an increase in the charge transfer resistance ( R ct ) of ferricyanide upon adsorption of phosphate on ZrO 2 is used for the determination of phosphate. This ZrO 2 ‐SPCE phosphate sensor shows a wide linear range up to 1 mM and a detection limit of 1.69 µM ( S / N =3). Practical applicability of the ZrO 2 ‐SPCE is demonstrated by detecting phosphate content in human blood samples.