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Tunable Magnetic Properties of (Gd,Ce) 2 O 2 S Oxysulfide Nanoparticles
Author(s) -
Larquet Clément,
Klein Yannick,
Hrabovsky David,
Gauzzi Andrea,
Sanchez Clément,
Carenco Sophie
Publication year - 2019
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201801466
Subject(s) - bimetallic strip , paramagnetism , nanoparticle , gadolinium , chemistry , lanthanide , magnetic nanoparticles , magnetic moment , nanoscopic scale , nanotechnology , nuclear magnetic resonance , materials science , condensed matter physics , metal , organic chemistry , ion , physics
Nanoparticles with strong paramagnetic responses are of prime interest for advanced MRI imaging. To replace expensive and toxic Gd complexes, Gd‐based nanoparticles have emerged as a viable solution for efficient and harmless MRI contrast agents. Gadolinium oxysulfide nanoparticles could represent suitable candidates for MRI imaging and bimodal imaging thanks to their excellent properties as host matrix and chemical stability, but their magnetic properties at the nanoscale have been hitherto poorly investigated especially in the case of ultrafine nanoparticles (< 10 nm), where surface effects and ligands can significantly affect the magnetic behavior. In the present work, we synthesized and characterized bimetallic (Gd,Ce) 2 O 2 S nanoparticles and demonstrated that they are paramagnetic over a wide temperature range including the body one. The mixture of Gd and Ce magnetic centers enables a fine control of the magnetic properties up to high Ce concentrations (80 %) and over a large range of magnetic moments, while photoemission properties are guaranteed up to 20 % of Ce owing to a regular dispersion of the Ce centers. The present study on bimetallic oxysulfide nanoparticles with high concentrations of two lanthanides shows that (Gd,Ce) 2 O 2 S nanoparticles are viable candidates as tunable nanoscale agents for bimodal imaging.