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. 2018 Mar 25;30(7):2400–2413. doi: 10.1021/acs.chemmater.8b00477

Figure 7.

Figure 7

(A) High resolution HAADF-STEM image of (ethanol washed) CIS seed NCs. The NCs have a trigonal pyramidal shape with an average base of 2.7 ± 0.3 nm and an average height of 2.5 ± 0.3 nm. (B) High resolution HAADF-STEM image of product NCs obtained after shelling reaction using the CIS NCs shown in panel A as seeds at 150 °C. The average size of the product NCs is 3.2 ± 0.7 nm for the base and 3.0 ± 0.4 nm for the height. (C) High resolution HAADF-STEM image of (ethanol washed) CIS seed NCs from a different batch with respect to those shown in panel A. The NCs have a trigonal pyramidal shape with an average base of 2.5 ± 0.3 nm and an average height of 2.3 ± 0.3 nm. (D) High resolution HAADF-STEM image of product NC obtained after shelling reaction using the CIS NCs shown in panel C as seeds at 210 °C. The average diameter of the product NCs in this sample is 4.7 ± 0.8 nm. (E) 3D visualization of a product CIS/ZnS NC from the same sample shown in panel D with indication of the position of the orthoslices shown in panels F and G. The inset shows the 3D visualization with the location of the core indicated in magenta. (F, G) Orthoslices through the 3D reconstruction shown in panel E (intensity is color-coded, increasing from blue to red in the same sequence as in the visible spectrum). Additional HR HAADF-STEM images are shown in the Supporting Information (Figure S7).