Multifunctional Nanoparticles with Superparamagnetic Mn(II) Ferrite and Luminescent Gold Nanoclusters for Multimodal Imaging

Barbara Casteleiro; Mariana Rocha; Ana R. Sousa; André M. Pereira; José M.G. Martinho; Clara R. Pereira; José P. S. Farinha

doi:10.20944/preprints202310.0032.v1

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preprints.org > chemistry and materials science > nanotechnology > doi: 10.20944/preprints202310.0032.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Multifunctional Nanoparticles with Superparamagnetic Mn(II) Ferrite and Luminescent Gold Nanoclusters for Multimodal Imaging

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Version 1 : Received: 1 October 2023 / Approved: 2 October 2023 / Online: 2 October 2023 (04:07:20 CEST)

A peer-reviewed article of this Preprint also exists.

Casteleiro, B.; Rocha, M.; Sousa, A.R.; Pereira, A.M.; Martinho, J.M.G.; Pereira, C.; Farinha, J.P.S. Multifunctional Nanoparticles with Superparamagnetic Mn(II) Ferrite and Luminescent Gold Nanoclusters for Multimodal Imaging. Polymers 2023, 15, 4392. Casteleiro, B.; Rocha, M.; Sousa, A.R.; Pereira, A.M.; Martinho, J.M.G.; Pereira, C.; Farinha, J.P.S. Multifunctional Nanoparticles with Superparamagnetic Mn(II) Ferrite and Luminescent Gold Nanoclusters for Multimodal Imaging. Polymers 2023, 15, 4392.

Abstract

Gold nanoclusters (AuNCs) with fluorescence in the Near Infrared (NIR) by both one- and two-photon electronic excitation were incorporated in mesoporous silica nanoparticles (MSNs) using a novel one-pot synthesis procedure where the condensation polymerization of alkoxysilane monomers in the presence of the AuNCs and a surfactant produce hybrid MSNs of 49 nm diameter. This method was further developed to prepare 30 nm diameter nanocomposite particles with simultaneous NIR fluorescence and superparamagnetic properties, with a core composed of superparamagnetic manganese ferrite nanoparticles (MnFe2O4) coated with a thin silica layer, and a shell of mesoporous silica decorated with AuNCs. The nanocomposite particles feature NIR-photoluminescence with 0.6% quantum yield and large Stokes shift (290 nm), and superparamagnetic response at 300 K, with a saturation magnetization of 13.4 emu g-1. The conjugation of NIR photoluminescence and superparamagnetic properties in the biocompatible nanocomposite has high potential for application in multimodal bioimaging.

Keywords

Gold nanoclusters; manganese ferrite nanoparticles; mesoporous silica; multimodal imaging; NIR-photoluminescence; superparamagnetism.

Subject

Chemistry and Materials Science, Nanotechnology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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