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Synthesis of Mixed-Valent Lanthanide Sulfide Nanoparticles

Published

Author(s)

Pricilla Glaser, Orlando Stewart, Rida Atif, Dane Asuigui, Joel Swanson, Adam Biacchi, Angela R. Hight Walker, Gregory Morrison, Hans-Conrad zur Loye, Sarah Stoll

Abstract

In targeting reduced valence lanthanides, we report the first nanoparticle synthesis of the mixed-valent ferromagnets Eu3S4 and EuSm2S4. Using divalent lanthanide halides with bis(trimethylsilyl)sulfide and oleylamine, we prepared nanoparticles of EuS, Eu3S4, EuSm2S4, SmS1.9, and Sm3S4. All nanoparticle phases were identified using powder X-ray diffraction, transmission electron microscopy was used to confirm morphology and nanoparticle size, and magnetic susceptibility measurements for determining the ordering temperatures and valence. The UV-visible and Raman spectroscopy, and X-ray Photoelectron spectroscopy for each phase were compared. Surprisingly, the phase is influenced by the halide and the reaction temperature, where EuCl2 formed EuS while EuI2 formed Eu3S4, highlighting the role of kinetics in phase stabilization. Interestingly, at lower temperatures EuI2 initially forms EuS, and converts over time to Eu3S4.
Citation
Angewandte Chemie-International Edition
Volume
60
Issue
43

Citation

Glaser, P. , Stewart, O. , Atif, R. , Asuigui, D. , Swanson, J. , Biacchi, A. , Hight Walker, A. , Morrison, G. , zur Loye, H. and Stoll, S. (2021), Synthesis of Mixed-Valent Lanthanide Sulfide Nanoparticles, Angewandte Chemie-International Edition, [online], https://doi.org/10.1002/anie.202108993, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932739 (Accessed October 25, 2021)
Created August 23, 2021, Updated October 12, 2021