Abstract
In this study, BT@ZnO:Yb heterostructures prepared using the combined sol-gel-hydrothermal methods were coated with chitosan (Qo) to obtain a hybrid heterostructure [BT@ZnO:Yb]-Qo. The structure, particle morphology, luminescence properties, and cytotoxicity of the hybrid heterostructure are discussed. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infra-red (FT-IR) as well as Raman and photoluminescence spectra, were used for characterisation and monitoring of the heterostructure formation process. The results reveal the formation of the BT@ZnO:Yb heterostructure, and are consistent with the relative intensities and positions of peaks in the XRD spectra of BT and ZnO:Yb, with the average particle size of ~75 nm. Effective Qo coating was achieved and a narrow, well-defined, and high-intensity luminescence signal was detected at ~610 nm for all the analysed samples. In vitro studies suggested that treatment with 1 µg/ml BT@ZnO:Yb 3 mol% induced very low cytotoxicity on HeLa cells.
Highlights
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BaTiO3@ZnO:Yb heterostructures can be obtained by the sol-gel-hydrothermal process.
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Effective heterostructures based on the coating with Qo, [BT@ZnO:Yb]-Qo, were synthesised with low cytotoxicity.
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The PL intensity depends on the pH of the dispersion medium.
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Ytterbium luminescence can be used in diagnostic imaging.
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Acknowledgements
This work has been partially financed by Basal Financing Program CONICYT, AFB180001 (CEDENNA). SF thanks to FONDEQUIP project EQM140044 and Scientific Equipment Unit – MAINI of Universidad Católica del Norte. This work was partially supported by a MINEDUC-UA project code ANT 1755 (to JLV).
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Fuentes, S., León, J., Vega, J.L. et al. Chitosan coating of BaTiO3@ZnO:Yb heterostructures: synthesis and properties. J Sol-Gel Sci Technol 95, 465–473 (2020). https://doi.org/10.1007/s10971-020-05329-5
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DOI: https://doi.org/10.1007/s10971-020-05329-5