Facile Fabrication of Zirconia Modified Screen‐Printed Carbon Electrodes for Electrochemical Sensing of Phosphate

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.

The art of signal transforming: electrodes and their smart applications in electrochemical sensing

“…The adaptability of screen printed electrodes is also of great benet in areas of research; the ability to modify the electrodes with ease allows for highly specic and nely calibrated electrodes to be produced for specic target analytes. [94][95][96][97] SPEs have been widely used for electrochemical sensing due to the ease of modication and cost effectiveness. Our article will not cover the total developments of SPEs in the eld of biological detection.…”

Oil|Water Interfacial Phosphate Transfer Facilitated by Boronic Acid: Observation of Unusually Fast Oil|Water Lateral Charge Transport

“…Electrochemical phosphate detection is difficult due to the electrochemically inert and highly hydrophilic nature of phosphate. However, new methods have been reported based on polymer–ferrocene derivatives,9 at zirconia modified screen printed electrodes,10 with molybdate‐based sensor films,11 and by voltammetric ion‐channel measurements 12…”