Discovery of an exceptionally strong luminescence of polyethyleneimine-superparamagnetic iron oxide nanoparticles

Ünal, Özlem and Khodadust, Rouhollah and Durmuşoğlu, Emek G. and Erdem, Emre and Yağcı, Mustafa Barış and Ow-Yang, Cleva W. and Yurtsever, Ersin and Yağcı Acar, Havva (2018) Discovery of an exceptionally strong luminescence of polyethyleneimine-superparamagnetic iron oxide nanoparticles. Macromolecular Chemistry and Physics, 219 (9). ISSN 1022-1352 (Print) 1521-3935 (Online)

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Polyethyleneimine (PEI) is rarely recognized as a luminescent polymer but is frequently used for the production of cationic nanoparticles and tagged with an organic fluorophore to be tracked optically. Herein, a strongly luminescent, branched PEI-superparamagnetic iron oxide nanoparticle (bPEI-SPION) without a traditional fluorophore is reported. A tremendous enhancement (1200 times) in the weak blue luminescence of bPEI is achieved only if it is adsorbed on a SPION during the synthesis of nanoparticles, which is improved further upon protonation, irreversibly. This is quite unexpected since SPIONs are strong absorbers in the visible region. All reaction parameters, different synthetic methods, as well as protonation are studied as independent factors to understand the origin of such enhancement. Detailed spectroscopic analysis and density functional theory calculations indicate that partial amine oxidation and Fe3+ reduction takes place during the synthesis, which significantly contributes to the luminescence enhancement. In addition, PEI-SPION exhibits excitation wavelength dependent emission and maintains its magnetic properties.
Item Type: Article
Uncontrolled Keywords: DFT; EPR; iron oxide nanoparticles; photoluminescence; polyethyleneimine
Subjects: Q Science > QD Chemistry
Q Science > QC Physics
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Sabancı University Nanotechnology Research and Application Center
Faculty of Engineering and Natural Sciences
Depositing User: Cleva W. Ow-Yang
Date Deposited: 08 Aug 2018 21:51
Last Modified: 23 May 2023 15:03

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