Highly sensitive and selective determination of dopamine based on graphite nanosheet-nafion composite film modified electrode

摘要

A graphite nanosheet (GNS)-Nafion modified glassy carbon (GC) electrode was prepared and used for highly sensitive and selective determination of dopamine (DA). The GNS-Nafion/GC electrode displayed excellent electrocatalytic activities towards DA and ascorbic acid (AA). The selective determination of DA was carried out successfully in the presence of AA by differential pulse voltammetry. High sensitivity (3.695 mA mM ~1) and low detection limit (0.02 mM, S/N 1/43) for the DA detection were obtained. These good properties can be attributed to a large amount of edge plane defects presented on GNSs and the charge-exclusion and concentration features of Nafion.