Electrodeposition of anionic, cationic and nonionic surfactants and gold nanoparticles onto glassy carbon electrode for catechol detection

Document Type: Original Research Paper


1 Chemistry Faculty, Razi University; Nano drug research center, Kermanshah University of Medical Sciences

2 Faculty of Chemistry, Razi University, Kermanshah, Iran

3 Faculty of Chemistry, Razi University, Kermanshah, Iran



Three surfactants were selected to modify glassy carbon electrode including sodium dodecylbenzenesulfonate, Tween 80 and cetyltrimethylammonium bromide. The obtained nano-Au/surfactant/GCEs were characterized with scanning electron microscopy and electrochemical techniques. Electrochemical behavior of catechol at the nano-Au/surfactant/GCE was thoroughly investigated for modified electrodes. Compared to the unmodified electrode, the peak current obviously increased and the oxidation and reduction peaks potential shifted to the negative and positive potential area, respectively, meaning the peak potential separation is reduced. These changes indicated that the composite nanoparticles possess good electrocatalytic performance on the electrochemical reaction of catechol. The experimental results revealed that the nanoparticle modified electrodes have good performances for catechol sensing, which including convenient fabrication, low detection limits and wide linear ranges. These merits of this sensing system provide high potential to apply in environmental monitoring. In addition, kinetic parameters of catechol redox reaction were determined and the number of electrons was obtained two for the three modified electrodes.