Fig. 1: Single-axis epitaxial controlled growth of heterogeneous nanorods.
From: Nanorods with multidimensional optical information beyond the diffraction limit
a Schematic diagram to illustrate the route that leads to the formation of the nanorods. Conditions, including the well-controlled amount of surfactant concentration (OA−) and the relatively low concentration of shell precursor, have to be met, otherwise, nanoplates, nanodumbbells, and small nanoparticles from precursor self-nucleation, will form. b High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images of three typical heterogeneous nanorods, including 10-segment NaYF4-NaErF4(10 nm)-NaYF4(5 nm)-NaErF4(10 nm)-NaYF4(5 nm)-NaErF4(10 nm), 10-segment NaYF4-NaErF4(5 nm)-NaYF4(5 nm)-NaErF4(5 nm)-NaYF4(5 nm)-NaErF4(5 nm), and 18-segment NaYF4-NaErF4(5 nm)-NaYF4(5 nm)-NaErF4(5 nm)-NaYF4(5 nm)-NaErF4(5 nm)-NaYF4(5 nm)-NaErF4(5 nm)-NaYF4(5 nm)-NaErF4(5 nm) nanorods, scale bar is 50 nm. c Large area HAADF-STEM image of 18-segment heterogeneous nanorods, scale bar is 100 nm. d Distance statistics of five pairwise NaErF4 segments (center-to-center of each pairwise with different color markers) of the heterogeneous nanorods in c.
