AuPd bimetallic nanoparticle-supported carbon nanotubes for selective detection of dopamine in the presence of ascorbic acid

Abstract

A carbon nanotube-supported AuPd bimetallic nanoparticle (AuPd/CNT) nanocomposite modified glassy carbon (GC) electrode was fabricated and its catalytic properties towards dopamine (DA) in the presence of ascorbic acid (AA) were studied. AuPd/CNTs were synthesized by the simple chemical reduction of Au and Pd salt precursors with CNTs. Under the optimal detection conditions, the amperometric i–t curve shows a linear response of DA over the range from 0.2 μM to 50 μM with a detection limit of 83 nM (S/N = 3) on AuPd/CNTs–Nafion/GCE. Furthermore, the developed sensor showed excellent anti-interference, reproducibility and stability, and was also proven to be feasible for DA determination in human urine samples, indicating the potential application of this nanocomposite for real sample analysis.