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. 2018 Mar 20;9:1141. doi: 10.1038/s41467-018-03550-z

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Details of the as-synthesized octapods with different pod length. a Sketches illustrating the geometrical parameters of an octapod nanocrystal and the variation in octapod aspect ratio. L and D represent the octapod length and diameter, respectively. The tip-to-center length of the pods is represented by L/2 and the actual length of the pod is given by P_I. The truncated octahedral CdSe seed is indicated in red and has radius r_{CdSe seed}. b BFTEM images of representative particles for the four octapod aspect ratios L/D studied in this work. Scale bars=20 nm. c Volume-weighted size distribution for D and P_I octapod parameters determined by XRD analysis. Data are presented as the average values and their standard error of the mean, σ_M. d Inverted-contrast HAADF-STEM views of the octapods evidencing the two families of tips observed in both octapods with small and large L/D aspect ratio. That is, four flat-terminated pods (framed in blue) and four pods with sharp tips (framed in cyan). Scale bars=20 nm and 50 nm for the small and large L/D aspect ratio, respectively