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. 2017 Dec 15;4:34. doi: 10.1186/s40580-017-0129-7

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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. 4 — Fabrication techniques for 3D metallic structures. a Silver chemical vapor deposition onto polymer template [50]. b Electroless plating in SU-8 3D template [51]. c Two-photon-induced photoreduction of metal ions [61], and d projection lithography technique [65]