Electropolymerization of Azure A and pH Sensing Using Poly(azure A)-modified Electrodes

Area of Science:

• Electrochemistry
• Materials Science
• Sensor Technology

Background:

• Development of novel electrochemical sensors is crucial for accurate analytical measurements.
• Glassy carbon electrodes (GCEs) are widely used platforms for electrochemical sensing.
• Polymeric materials offer unique properties for electrode modification.

Purpose of the Study:

• To develop a modified electrode for pH sensing.
• To investigate the electrochemical properties of poly(azure A) immobilized on GCE.
• To evaluate the performance of the modified electrode as a pH sensor.

Main Methods:

• Electropolymerization of azure A (AA) onto a glassy carbon electrode surface.
• Characterization using cyclic voltammetry (CV) and differential pulse voltammetry (DPV).
• Investigation of the effect of solution pH on the redox response of the modified electrode.

Main Results:

• The poly(azure A) (pAA) modified electrode exhibited stable redox behavior.
• The redox reaction involved H+ ions and followed the Nernst equation.
• Peak potential shifts were observed with changes in pH, with DPV showing greater sensitivity than CV.
• The sensor demonstrated reliable performance in the pH range of 1-10.
• The electrode showed good reusability over 50 cycles.

Conclusions:

• The developed pAA-modified electrode is a promising candidate for electrochemical pH sensing.
• DPV offers enhanced sensitivity for pH detection compared to CV.
• The sensor exhibits a wide operational pH range and good stability, suitable for practical applications.