Graphene-Multiwalled Carbon Nanotubes Modified Glassy Carbon Electrodes for Simultaneous Detection of Ascorbic Acid, Dopamine, and Uric Acid.

This study compares the sensing performance of glassy carbon electrodes (GCE) modified with graphene (GR), multiwalled carbon nanotubes (MWCNTs), and graphene-multiwalled carbon nanotube (GR-MWCNT) composites for the simultaneous detection of ascorbic acid (AA), dopamine (DA), and uric acid (UA). Among these electrodes, GR-MWCNT/GCE exhibited the highest sensitivity and the lowest detection limit. Using differential pulse voltammetry (DPV), AA, DA, and UA can be simultaneously detected at low potentials of -0.