Comparison of different modifications of screen‐printed working electrodes of electrochemical sensors using carbon nanotubes and plasma treatment

摘要: The screen-printed working electrode (WE) of an electrochemical sensor was modified with multi-walled carbon nanotubes (MWCNTs) and a plasma treatment. treatment performed using radio frequency capacitively coupled discharge in Ar/O-2, Ar/cyclopropylamine and Ar/NH3. surface the WEs was characterized by scanning electron microscopy their electrochemical behaviours were studied using potassium ferro/ferricyanide dopamine as standard electrochemical probes. most promising results obtained the electrodes oxygen because reversibility and current response both improved significantly. The peak-to-peak separation from 879 to 116mV after the oxygen bare DuPont 7102 electrode. Spray-coated MWCNTs had positive effect on performance of the WE if sprayed layer was thicker. However, this improvement did not reach the performance by plasma oxidation. modification Ar/NH3 weak influence on depending type and plasma Ar/cyclopropylamine led an inhibition electrochemical reactivity due a preparation too thick insulating film.