Spinel MnFe 2 O 4 /N‐Doped Carbon Nanotube Composite for Sensitive Electrochemical Detection of Dopamine

There still remains a number of challenges for the electrochemical detection of dopamine (DA) in low concentration with some interferents, which has driven increasing interest in the development of material capable of delivering high sensitivity. In this study, nanocomposite of MnFe 2 O 4 spinel and N‐doped carbon nanotubes (MnFe 2 O 4 /N‐CNTs) was synthesized via a relatively simple hydrothermal method. The composite exhibited excellent electrochemical sensing of DA performance due to the synergic effect of the MnFe 2 O 4 and N‐CNTs. Under the optimal conditions, a wide linear range of 0.8–210 µM, with a low limit of detection of 0.34 µM ( S / N = 3) was achieved. This electrochemical sensing system has high stability, reproducibility, and anti‐interference. The recovery (99.0%–100.6%) and reasonable relative standard deviation (1.28%–2.15%) for determination of real samples indicates it is promising for future applications of the sensing system.