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. 2021 Apr 27;5(4):417–430. doi: 10.7150/ntno.59568

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Synthesis and characterization of EuS particles. (A) Synthesis scheme of EuS particles. 1-Dodecanethiol served as a reducing agent plus sulfur precursor; the vial shows particle fluorescence. (B) Low-resolution TEM image of EuS is illustrated. The EuS dimensions were approximately 25 nm in diameter by ~ 350-500 nm in length. (C) HR-TEM images of a single EuS particle with lattice planes of 0.37 nm, corresponding with XRD data. (D-E) The selected area electron diffraction (SAED) pattern of EuS show characteristic interplanar spacing of the EuS single crystal structure. (F) The europium (red) and sulfur (green) element STEM mapping showed element localization within the particles by corresponding high-angle annular dark-field electron microscopy. (G) XRD patterns, correlating with HR-TEM lattice pattern and SAED data sets, confirmed the particles' structural configurations. (H) Chemical composition of EuS particles assessed by EDX qualitatively demonstrated the particle elements.