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Issue 3, 2020
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Binary activated iron oxide/SiO2/NaGdF4:RE (RE = Ce, and Eu; Yb, and Er) nanoparticles: synthesis, characterization and their potential for dual T1T2 weighted imaging

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Abstract

We report the microwave-assisted synthesis of binary doped optical-magnetic up/downconverting NaGdF4:RE and iron oxide/SiO2/NaGdF4:RE nanoparticles. The morphological characteristics were finely tuned from elongated rod-shaped to ovoidal nanoparticles. The (Yb, and Er) activated particles provided an excellent up/down conversion luminescence emission in the green and mid-infrared region under excitation of 980 nm, whereas the (Ce, and Eu) activated systems exhibited a strong red emission via the Gd3+ sublattice upon excitation in the UV region. The magnetic hysteresis at 300 K for β-NaGdF4:RE showed typical signatures of a paramagnetic system, whereas iron oxide/SiO2/β-NaGdF4:RE exhibited superparamagnetic behavior along with a Curie-like component. The luminescence quenching effects induced by the presence of iron oxide phase have been validated through comparing the emission/lifetime decay curves. In addition to the excellent optical and magnetic properties, these materials show remarkably high longitudal and transverse relaxivity values (for Fe and Gd) and thus are potential candidates for T1 and T2-weighted bioimaging.

Graphical abstract: Binary activated iron oxide/SiO2/NaGdF4:RE (RE = Ce, and Eu; Yb, and Er) nanoparticles: synthesis, characterization and their potential for dual T1–T2 weighted imaging

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Supplementary files

Article information


Submitted
29 Jul 2019
Accepted
28 Nov 2019
First published
29 Nov 2019

New J. Chem., 2020,44, 832-844
Article type
Paper

Binary activated iron oxide/SiO2/NaGdF4:RE (RE = Ce, and Eu; Yb, and Er) nanoparticles: synthesis, characterization and their potential for dual T1T2 weighted imaging

N. Shrivastava, J. Garcia, U. Rocha, C. Ospina, D. Muraca, A. S. de Menezes, C. Jacinto, A. Y. Louie, G. Zoppellaro and S. K. Sharma, New J. Chem., 2020, 44, 832
DOI: 10.1039/C9NJ03929E

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