Mesoporous perovskite-type La0.8Sr0.2Cu0.7Mn0.3O3/SiO2 nanocomposite-decorated-graphene-oxide nanosheets: Green synthesis and application in the sensitive determination of Morin in kiwi fruit samples

Perovskite nanocrystals (PNCs) are highly tolerant to defects, unlike metal chalcogenides, and do not need surface passivation to retain high quantum yields. Remarkably, the defect structures and trap states in perov-skites are often found only in their conduction and/or valence bands and not in the mid-states of the bandgap. Such intrinsic features of them essentially boost their properties and largely favor their sensing applications. In the present research work, perovskite/graphene oxide nanosheets were used to modify the surface of a glassy carbon electrode to the determination of the Morin in the kiwifruit samples. For this purpose, perovskite nanosheets were synthesized using the sol-gel method and combined with graphene oxide, which was prepared using Hummer's method, to prepare the modifier suspension. To ensure the effective synthesis of the perovskite nanosheets, the morphological study has been applied and the modified electrode was examined by various characterization techniques. The electrochemical behavior of Morin on the surface of the modified carbon glass electrode was investigated using the cyclic voltammetry (CV) technique. The analytical figure of merits including the linear range of 10-110 mu M and a detection limit of 4.49 mu M were obtained. Finally, the designed sensing assay was efficiently applied for the determination of Morin in kiwifruit. The results obtained from the prepared sensor indicate suitable analytical properties including low detection limits, wide linear range, and good per-formance for the determination of Morin. Moreover, to check the accuracy of the proposed assay, the recovery index of 97 % indicates high performance in real samples. Stability, repeatability, and high reproducibility of the modified electrode are other prominent analytical features of the designed sensor. Consequently, it was possible to verify that the sensing assay has the potential for being desirably utilized in the determination of Morin in various real samples.

Automated summary

In this study, perovskite nanocrystals were used to modify the surface of a glassy carbon electrode for the determination of Morin in kiwifruit samples. The electrochemical behavior of Morin on the modified electrode was investigated, and the analytical figures of merit were obtained. The designed sensing assay showed suitable analytical properties and high performance in real samples.