Fe2O3/MWCNTs nanocomposite decorated glassy carbon electrode for the determination of nitrite

A novel ferric oxide/multi-walled carbon nanotubes (Fe2O3/MWCNTs)-modified glassy carbon electrode (GCE) was prepared by drop casting Fe2O3/MWCNTs onto the surface ofGCE. Scanning electron microscopy (SEM) image shows that the Fe2O3/MWCNTs has a nanostructure. Cyclic voltammetry (CV) results show that the Fe2O3/MWCNTs-modified GCE presents excellent electrochemical activity in the presence of 1 mM nitrite in a 0.1 M phosphate-buffered saline (PBS) to compare the Fe2O3 and MWCNTs-modified GCE. Differential pulse voltammetry (DPV) results also show that the Fe2O3/MWCNTs has excellent electrocatalytic performance to nitrite in a pH 7.0 PBS. The amperometric response result shows that the Fe2O3/MWCNTs-modified GCE can be used to detect nitrite concentration in a wide linear range of 10-1000 mu M with a detection limit of 0.1 mu M.