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. 2019 Sep 11;14:311. doi: 10.1186/s11671-019-3144-2

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© The Author(s). 2019

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. 1 — Fabrication and structure of the 2DW-WTNG. a Schematic diagram illustrating the fabrication process. SEM images of the nylon thread (b) and the polyester thread (c), respectively. Optical images of the nylon thread coated copper wire (d) and the polyester thread coated steel wire (e), respectively. f Optical images of the 2DW-WTNG