Figure 1
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(A) Schematic illustration for the fabrication of NYF@DCN. SEM images of (B) MCA-EG and (C) DCN. Transmission electron microscopy (TEM) images of (D) DCN, (E) NYF, (F) NYF-35@DCN. (G) High-resolution transmission electron microscopy (HRTEM) image of NYF-35@DCN. (H) High-magnification scanning transmission electron microscopy image with the corresponding elemental mapping of C, N, S, Na, Y, F, Yb, and Tm for NYF-35@DCN (scale bar: 500 nm).
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