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Mn-Doped Quinary Ag–In–Ga–Zn–S Quantum Dots for Dual-Modal Imaging

Abstract : Doping of transition metals within a semiconductor quantum dot (QD) has a high impact on the optical and magnetic properties of the QD. In this study, we report the synthesis of Mn 2+-doped Ag−In−Ga−Zn−S (Mn:AIGZS) QDs via thermolysis of a dithiocarbamate complex of Ag + , In 3+ , Ga 3+ , and Zn 2+ and of Mn(stearate) 2 in oleylamine. The influence of the Mn 2+ loading on the photoluminescence (PL) and magnetic properties of the dots are investigated. Mn:AIGZS QDs exhibit a diameter of ca. 2 nm, a high PL quantum yield (up to 41.3% for a 2.5% doping in Mn 2+), and robust photo-and colloidal stabilities. The optical properties of Mn:AIGZS QDs are preserved upon transfer into water using the glutathione tetramethylammonium ligand. At the same time, Mn:AIGZS QDs exhibit high relaxivity (r 1 = 0.15 mM −1 s −1 and r 2 = 0.57 mM −1 s −1 at 298 K and 2.34 T), which shows their potential applicability for bimodal PL/magnetic resonance imaging (MRI) probes.
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https://hal.univ-lorraine.fr/hal-03469094
Contributor : Sebastien Leclerc Connect in order to contact the contributor
Submitted on : Tuesday, December 7, 2021 - 2:55:36 PM
Last modification on : Thursday, November 10, 2022 - 4:38:22 AM

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Perizat Galiyeva, Hervé Rinnert, Sabine Bouguet-Bonnet, Sebastien Leclerc, Balan Lavinia, et al.. Mn-Doped Quinary Ag–In–Ga–Zn–S Quantum Dots for Dual-Modal Imaging. ACS Omega, 2021, 6 (48), pp.33100 - 33110. ⟨10.1021/acsomega.1c05441⟩. ⟨hal-03469094⟩

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