Ag ion irradiated based sensor for the electrochemical determination of epinephrine and 5-hydroxytryptamine in human biological fluids

► Ag ions irradiation enhances the electrocatalytic activity of carbon nano tubes. ► The low fluence of irradiation caused the ordering of carbon nano tubes. ► Simultaneous determination of epinephrine and 5-hydroxytryptamine has been carried out. ► The determination of the neurotransmitters in human blood and urine is reported.