a non-enzymatic textile-based urea sensor using ag doped nio

Abstract: among the various compounds, many metals and their oxides have been used as modifiers for the preparation of non-enzymatic electrochemical sensors. different fabric bases have been used to make flexible sensors [1]. in the present work, we have designed a modified carbon paste electrode based on a suitable fabric using ag-doped nio (ag@nio) as a non-enzymatic electrochemical urea sensor. various techniques for studying the structure of synthesized ag@nio include scanning electron microscopy (sem), energy scattered x-ray spectroscopy (edx), electrochemical impedance spectroscopy (eis), diffuse reflectance spectroscopy (drs), and x-ray diffraction (xrd) were used. electrochemical impedance spectroscopy and cyclic voltammetric methods have been used to study the electrochemical properties of the prepared electrode. the amperometric method was used to quantitative determination of urea using the prepared electrode. this electrode is very suitable for measuring urea in alkaline solutions. important features of the electrode are high sensitivity, wide linear range (2.5 × 10-3 to 5.0 mmol l-1), low detection limit ((8 × 10-4 mmol l-1), long-term stability, and very good selectivity. finally, the prepared electrode was used to determine the urea concentration in human sweat samples.