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Magnetism and Afterglow United: Synthesis of Novel Double Core–Shell Eu 2+ ‐Doped Bifunctional Nanoparticles
Author(s) -
Terraschke Huayna,
Franzreb Matthias,
Wickleder Claudia
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904551
Subject(s) - afterglow , bifunctional , materials science , nanoparticle , luminescence , quenching (fluorescence) , magnetism , doping , nanotechnology , persistent luminescence , nanocomposite , fluorescence , photochemistry , analytical chemistry (journal) , optoelectronics , chemistry , optics , physics , thermoluminescence , condensed matter physics , biochemistry , gamma ray burst , chromatography , astronomy , catalysis
Afterglow–magnetic nanoparticles (NPs) offer enormous potential for bioimaging applications, as they can be manipulated by a magnetic field, as well as emitting light after irradiation with an excitation source, thus distinguishing themselves from fluorescent living cells. In this work, a novel double core–shell strategy is presented, uniting co‐precipitation with combustion synthesis routes to combine an Fe 3 O 4 magnetic core (≈15 nm) with an afterglow SrAl 2 O 4 :Eu 2+ ,Dy 3+ outer coat (≈10 nm), and applying a SiO 2 protective middle layer (≈16 nm) to reduce the luminescence quenching caused by the Fe core ions. The resulting Fe 3 O 4 @SiO 2 @SrAl 2 O 4 :Eu 2+ ,Dy 3+ NPs emit green light attributed to the 4f 6 5d 1 →4f 7 ( 8 S 7/2 ) transition of Eu 2+ under UV radiation and for a few seconds afterwards. This bifunctional nanocomposite can potentially be applied for the detection and separation of cells or diagnostically relevant molecules.