Facile Synthesis of Co₉S₈ Nanocages as an Electrochemical Sensor for Luteolin Detection

Abstract

A novel Co9S8 nanocage was fabricated via a metalorganic frameworks engaged strategy. The morphology and structure of the resulting Co9S8 nanocage were carefully confirmed by scanning electron microscopy, powder X-ray diffraction, transmission electron microscope, and X-ray photoelectron spectroscopy. Then the as-synthesized Co9S8 nanocage material was immobilized on a glassy carbon electrode (GCE) and served as an efficient sensing platform for determination of luteolin. Under optimized conditions, the prepared Co9S8/GCE shows significant electrocatalytic activity toward the oxidation of luteolin. By comparison with GCE and CoS/GCE, the proposed Co9S8/GCE results in great improvement in the electrochemical response of luteolin. Meanwhile, the Co9S8 based-sensor presents an excellent linear relationship with the concentration of luteolin ranging from 0.01 to 20 μM. Then, the limit of detection based on S/N = 3 was estimated to be 0.8 nM. In addition, the Co9S8/GCE displays good repeatability, reproducibility, and selectivity. Finally, the simplicity and low cost of this sensor makes it possible to determination luteolin in actual sample with good accuracy and precision.

Zeolitic Imidazolate Frameworks Derived Co9S8/Nitrogen‐Doped Hollow Porous Carbon Spheres as Efficient Bifunctional Electrocatalysts for Rechargeable Zinc–Air Batteries

“…XRD patterns (Figure 3a, Figure S8a) of Co 9 S 8 NPs/NHCS‐0.5 display the four peaks located at 29.8°, 31.2°, 47.6°, and 52.1° are indexed to the (311), (222), (511), and (440) reflections of Co 9 S 8 crystal respectively, as supported by the HRTEM (Figure 2f) [21] . However, the characteristic peaks of Co 9 S 8 crystal are not distinct for the Co 9 S 8 NPs/NHCS‐0.1, may likely due to the little amount of Co 9 S 8 NPs.…”

“…XRD patterns (Figure 3a, Figure S8a) of Co 9 S 8 NPs/NHCS-0.5 display the four peaks located at 29.8°, 31.2°, 47.6°, and 52.1°a re indexed to the (311), ( 222), (511), and (440) reflections of Co 9 S 8 crystal respectively, as supported by the HRTEM (Figure 2f). [21] However, the characteristic peaks of Co 9 S 8 crystal are not distinct for the Co 9 S 8 NPs/NHCS-0.1, may likely due to the little amount of Co 9 S 8 NPs. Moreover, there are two broadly diffraction peaks located at 26.1°and 42.2°, corresponding to the (002) and (100) planes of graphitic carbon, [22] indicating the generation of graphitic carbons in Co 9 S 8 NPs/NHCS-0.5, which is agreement with HRTEM result (Figure 1f).…”

An ultrasensitive luteolin electrochemical sensor based on a glass carbon electrode modified using multi-walled carbon nanotube-supported hollow cobalt sulfide (CoSx) polyhedron/graphene quantum dot composites

“…26 Recently, the zeolitic imidazolate frameworks (ZIFs) as a class of MOFs, with porous characteristics and rich metal species, were used as precursors or sacrificial templates to prepare hollow nanostructures. 24,[27][28][29] For example, Co 9 S 8 nanocages, Co 9 S 8 /Zn 0.5 Cd 0.5 S hollow nanocages, and N-doped fibrous hollow carbon nanoparticles have been synthesized by using different MOFs as templates, [30][31][32] which not only exhibited significant electrocatalytic activity and promoted electron transfer processes but also successfully avoided the complex template removal process. Hence, ZIFs were used as an ideal template to prepare hollow structure materials.…”

Evaluation of Electrochemical Performance of Cobalt Sulphide on Various Current Collectors

“…It has many stichometry configurations due to its multiple oxidation states, such as Co x S y , where x=1,2,3 and y=1,2,4,9. CoS, [2][3][4] Co 3 S 4 , 5 and Co 9 S 8 6 have all been investigated. Researchers used composite formation to improve the electrochemistry of cobalt sulphide.…”