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Bio-conjugation of CaF2:Eu/chitosan nanoparticles with BSA and photoluminescent properties

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Abstract

CaF2:Eu nanoparticles capped with chitosan and bio-conjugation of CaF2:Eu/chitosan nanoparticles with bovine serum albumin (BSA) were synthesized via microemulsion method. As a surfactant, chitosan was employed to cap the nanoparticles during the synthesis process and provided functional groups, such as amino group for further bio-conjunction with BSA. CaF2:Eu and CaF2:Eu/chitosan–BSA nanoparticles were characterized by means of X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), ultraviolet spectrophotometer (UV), infrared spectrophotometer (IR) and photoluminescence spectrophotometer (PL). The XRD results indicated that the CaF2:Eu and CaF2:Eu/chitosan-BSA nanoparticles have crystallized well and the average sizes were about 16 and 19 nm, respectively. Images of FE-SEM showed that the average grain sizes of the CaF2:Eu and bio-conjunction of CaF2:Eu/chitosan nanoparticles with BSA were about 19 and 20 nm. The patterns of UV spectra and IR spectra showed that BSA was linked to CaF2:Eu/chitosan nanoparticles. In the emission spectrum of the CaF2:Eu/chitosan–BSA nanoparticles, characteristic emission peaks of Eu3+ within the wavelength ranging from 500 to 700 nm were observed, corresponding to the transitions from the excited 5D0 levels to 7FJ levels. This confirmed that the Eu3+dopant ion is located in a Ca2+ crystal site with Td symmetry.

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Acknowledgments

This work was supported by the Postdoctoral Fund of Dalian Nationalities University (20056110).

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Authors and Affiliations

  1. College of Life Science, Dalian Nationalities University, Dalian, 116600, China

    Yue Tian, Ji-Cheng Yu, Xiao-Hui Qi, Xiao-Wei Wu, Rui-Nian Hua & Sheng-Di Fan

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  1. Yue Tian
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  2. Ji-Cheng Yu
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  3. Xiao-Hui Qi
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  5. Rui-Nian Hua
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Correspondence to Rui-Nian Hua.

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Tian, Y., Yu, JC., Qi, XH. et al. Bio-conjugation of CaF2:Eu/chitosan nanoparticles with BSA and photoluminescent properties. J Mater Sci: Mater Electron 20, 439–444 (2009). https://doi.org/10.1007/s10854-008-9748-4

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