nanoscale synthesis of polyoxovanadate organic-inorganic hybrid for naked-eye dopamine detection

Decavanadate based compounds as a class of polyoxometalates family are known for their wide range of applications in chemical, biological, and physical sciences. considering the size-dependent chemical properties of polyoxometalates and the unique properties of decavanadates, the nanoscale (hnic)6[v10o28].h2o (1), an organic-inorganic hybrid compound was synthesized using ultrasound and in the presence of a weak solvent. the nanostructures were characterized by ft-ir spectroscopy, powder x-ray diffraction (pxrd), scanning electron microscopy (sem), energy dispersive x-ray spectroscopy (eds), and elemental analysis. the results showed that by increasing the amount of the weak solvent, the size and crystallinity of nanoparticles decreased. optical studies revealed a green emission with a maximum at 530 nm from nanoscale 1 which is assigned to o→v charge transfer transition and it was used for dopamine (da) detection. interestingly, nanoscale 1 catalyzed the in-situ formation of polydopamine nanoparticles, the formation of which decreased the fluorescence intensity of nanoscale 1 which was successfully utilized for naked-eye dopamine molecules detection.