Importance of the Mixing and High-Temperature Heating Steps in the Controlled Thermal Coprecipitation Synthesis of Sub-5-nm Na(Gd-Yb)FTm

Abstract : In order to achieve a significant size reduction to get ultrasmall upconverting nanoparticles (UCNPs) following a thermal coprecipitation pathway, we identified two critical points the UCNP precursor mixing and high-temperature heating steps. Significant differences could be observed according to the way the inorganic sodium and fluoride sources were mixed to the rare-earth oleate before the high-temperature heating step. More interestingly, accurate monitoring of the high-temperature heating step using microwave (MW) dielectric heating yielded major improvement toward ultrasmall UCNPs. Thus, hexagonal, Tm-doped sub-5-nm UCNPs with an unusual Na(Yb-Gd)F matrix with 53% Yb were produced, displaying satisfactory luminescence. Noticeably, MW heating was achieved in a weakly MW-absorbing oleic acid (OA)/octadecene mixture, and the influence of the OA content composition on the MW heating efficiency is discussed in this report.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-02087805
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Submitted on : Tuesday, April 2, 2019 - 1:16:24 PM
Last modification on : Friday, June 14, 2019 - 1:02:13 PM

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Baptiste Amouroux, Clément Roux, Jean-Daniel Marty, Mathieu Pasturel, Aude Bouchet, et al.. Importance of the Mixing and High-Temperature Heating Steps in the Controlled Thermal Coprecipitation Synthesis of Sub-5-nm Na(Gd-Yb)FTm. Inorganic Chemistry, American Chemical Society, 2019, 58 (8), pp.5082-5088. ⟨10.1021/acs.inorgchem.9b00143⟩. ⟨hal-02087805⟩

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