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. 2017 Dec 8;10(2):23. doi: 10.1007/s40820-017-0176-y

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 3 — Representative scanning electron microscopic images of the 2D basic building blocks and common 3D hierarchical structures.

Reproduced with the permission from Ref. [84, 98, 122, 151, 169, 211]