Electrochemical analysis of ascorbic acid, dopamine, and uric acid on nobel metal modified nitrogen-doped carbon nanotubes

Abstract

Simultaneous oxidation of ascorbic acid (AA), dopamine (DA), and uric acid (UA) in phosphate puffer solution (pH 7.0) on films consisting of nitrogen-doped multi-walled carbon nanotubes (N-MWCNTs) decorated with 2.7nm rhodium (RhNPs), 2.6nm palladium (PdNPs), 2.7nm iridium (IrNPs), 2.7nm platinum (PtNPs), and 14nm gold (AuNPs) nanoparticles show a lower limit of detection towards simultaneous oxidation of AA (7.9, 6.8, 6.1, 3.1, and 0.9μM, respectively), DA (1.1, 0.8, 0.7, 0.6, and 0.3μM, respectively), and UA (4.1, 3.6, 3.1, 2.1, 0.4μM, respectively). The findings demonstrate that the film’s lower limit of detection towards simultaneous oxidation of AA, DA, and UA tends to decrease with the order: N-MWCNTs>N-MWCNTs/RhNPs>N-MWCNTs/PdNPs>N-MWCNTs/IrNPs>N-MWCNTs/PtNPs>NMWCNTs/AuNPs. The findings suggest that N-MWCNTs/MNPs can be considered as potential electrode material for electrochemical simultaneous analysis of AA, DA, and UA.