Abstract
Herein, hollow and porous nano-dodecahedron embedded with cobalt oxide nanoparticles (HPND-CN) was prepared for the detection of rutin (Rut). HPND-CN was synthesized by the pyrolysis of zeolitic imidazolate frameworks (ZIFs). HPND-CN displayed a uniform rhombic dodecahedral morphology. For the main architecture, the original framework was carbonized after pyrolysis leading to a porous graphitized polyhedron with nitrogen doping. Notably, in the polyhedron, spherical cobalt oxide nanoparticles with more CoO and less Co2O3 were evenly implanted. With embedded oxide nanoparticles, active doping species, polyhedral morphology, and porous graphitized structure, HPND-CN displayed a strong electrocatalysis towards the redox of Rut. A pair of well-defined symmetric peaks for Rut redox was clearly observed. Based on the electrocatalysis of HPND-CN, an efficient Rut sensor was developed with a low detection limit of 1.9 nM and broad detection range from 7.0 nM to 1.0 μM. HPND-CN prepared sensor also exhibited a superb selectivity showing no interference from common inorganic ions, carbohydrates, and amino acids. Besides, excellent repeatability, reproducibility and reliability were observed. Moreover, HPND-CN sensor was successfully applied to the measurement of Rut in health-care tablets with convinced results, indicating a substantial electrochemical sensing platform for the electrocatalysis and detection of macromolecules.
Published Version
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