Facile Fabrication of Zirconia Modified Screen‐Printed Carbon Electrodes for Electrochemical Sensing of Phosphate |
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Authors: | Wan‐Ling Cheng Jen‐Lin Chang Ya‐Ling Su Jyh‐Myng Zen |
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Institution: | Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan |
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Abstract: | We report here a facile method to immobilize zirconia nanoparticles on a disposable screen‐printed carbon electrode (designated as ZrO2‐SPCE) for phosphate sensor application. Simply by ultrasonicating a bare SPCE in a ZrO2 slurry, ZrO2 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 (Rct) of ferricyanide upon adsorption of phosphate on ZrO2 is used for the determination of phosphate. This ZrO2‐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 ZrO2‐SPCE is demonstrated by detecting phosphate content in human blood samples. |
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Keywords: | Zirconia Phosphate Ultrasonicating Screen‐printed carbon electrode Electrochemical impedance spectroscopy |
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