Single-walled carbon nanohorns and cobalt@nitrogen-doped carbon nanotube polyhedrons modified electrode as sensitive electrochemical sensing platform for luteolin detection

In this work, ZIF-8@ZIF-67 was prepared and pyrolyzed to obtain Co nanoparticles-embedded N-doped carbon nanotube hollow polyhedron (Co@NCNHP). Then, single-walled carbon nanohorns (SWCNHs) were mixed with Co@NCNHP to obtain the SWCNHs-Co@NCNHP composite. The morphological structure of the prepared material was characterized by scanning electron microscopy, and the as-prepared SWCNHs-Co@NCNHP was modified on the surface of glassy carbon electrode (GCE). The modified electrode was used as electrochemical sensor for analysis of luteolin. Because of the excellent synergistic effects between SWCNHs and Co@NCNHP, the sensor based on SWCNHs-Co@NCNHP/GCE could be used to detect luteolin with the detection range from 0.1 to 4.0 μM and the low limit of detection of 10.0 nM (S/N = 3). Besides, the fabricated sensor showed favorable selectivity and stability, and was used in the analysis of luteolin in Duyiwei capsules with satisfactory results.