A Nanocomposite Material Based on Carbon Nanotubes and Fe₃O₄@SiO₂ for the High Selective and Sensitive Electrochemical Determination of Norepinephrine

摘要

An electrochemical sensor was prepared by modifying a graphite screen printed electrode (SPE) with a nanocomposite of magnetic Fe3O4@SiO2 nanocomposite and carbon nanotubes (CNTs) for the determination of norepinephrine (NE). Compared with a bare SPE, the Fe3O4@SiO2/CNTs/SPE highly enhanced the current response for NE. A linear plot was obtained for current responses versus the concentrations of NE in the range of 0.5 to 400.0 μM with a detection limit of 0.2 μM.