Skip to main content
. 2015 Jun 26;6:7571. doi: 10.1038/ncomms8571

Figure 4. HR-TEM images and FFT patterns of regrown bipyramids with singular and binary surfactants.

Figure 4

(a) Schematic illustrations for cyclic penta-tetrahedral twinning of bipyramids. The grey area shows the cross-section of the bipyramid perpendicular to the growth direction. Each twinning plane is labelled from T1 to T5. Schematic on the right of the panel shows most of the possible orientations of bipyramids on the substrate with respect to the beam direction. Regrown bipyramids in Fig. 3a—conditions 1–3 for b–d, respectively; Fig. 3b—conditions 7–9 for e–g, respectively; Fig. 3b—conditions 6 and 10 for h and i, respectively. Magnified images showing the lattice fringes represent the areas marked with white boxes at the tip and middle of particles. The black arrows in h indicate the twin planes of the spherical tips in the dumbbell-shaped structures. Scale bars, 20 nm (low-magnification images); 2 nm (high-magnification images).