See Theme: Electrochemical sensors and sensor systems

Redox control for pH regulation using 4-aminothiophenol

The electrochemical activation of redox active substances can be used to control the chemical environment through the regulation of pH. We investigate 4-Aminothiophenol (4ATP) to store and release protons to change the pH. We explore different polymerization of 4ATP on Au electrodes to improve the relevant properties for microfluidic applications. We investigate the polymerizations of 4ATP on Au substrates using electrochemical measurements and surface characterization methods. Electrochemical (Epoly) and ultraviolet polymerization (UVpoly) were probed under different speed-rates, because theoretical studies claim they have different polymerization reactions [2] that could lead to different reversibility efficiencies. The surface coverage and the reversibility of redox reactions of the polymerized molecules for both techniques were analysed and compared. The pH change as a function of these reversible processes was modelled.

A miniaturized electrochemical cell enabling the control of the pH by redox active groups of 4 aminothiophenol

Divya Balakrishnan, César Pascual García
Luxembourg Institute of Science and Technology (LIST), Luxembourg
University of Twente, Netherlands

Contact information:

Wouter Olthuis

Project carried out by:
Divya Balakrishnan

Daily supervisor:
César Pascual García


Material Research & Technology Department (MRT)
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