Nitrogen Coordinated Copper Co-Doped Multi-Walled Carbon Nanotubes for High-Efficiency Electrochemical Sensing of Bisphenol A

Multi-doping strategy plays an important role in improving the properties of carbon nanomaterials for fabricating electrochemical sensor with high performance. In this study, a novel nanohybrid nitrogen coordinated copper co-doped multi-walled carbon nanotubes (MWCNTs@Cu-N-PC) was prepared via a simply green method and used then successfully for the sensitive and selective electrochemical detection of bisphenol A (BPA). The synthesized MWCNTs@Cu-N-PC was characterized through various means including scanning electron microscopy, energy dispersive spectrometer, transmission electron microscopy, X-ray diffraction, Raman spectra and electrochemical methods. As for the electrochemical sensing of BPA based on MWCNTs@Cu-N-PC, the results show that MWCNTs@Cu-N-PC modified electrode can exhibit much better sensing performance than the other related modified electrodes because of the synergistic effects from N and Cu co-doping, and it has a wide linear range (0.01–100 μM) and low limit of detection (5.8 nM) for BPA under the optimized conditions. Furthermore, the MWCNTs@Cu-N-PC electrode shows excellent selectivity, reproducibility, stability and high recovery value for real samples analysis. It's believed that MWCNTs@Cu-N-PC has potential applications in electrochemical sensing, and this work also offers a new and simple way for synthesizing N-coordinated metal co-doped nanomaterials.