Facile-Controlled Epitaxial Growth Direction of Heterogeneous Core/Shell Structured NaLnF₄ Nanocrystals through Traditional Methods

Figure 3

(a, b) TEM images of nanoscale hexagonal prismatic obtained from pie-shaped nanoparticles with NaYF₄ shell growing in the [0001] direction (longitudinal growth). (c, d) TEM images of nanoscale dumbbells with three rings around the side faces obtained from dumbbell-like nanoparticles with NaYF₄ shell growing in the [100] direction (transverse growth).

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