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. 2018 Jul 24;13:221. doi: 10.1186/s11671-018-2637-8

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© The Author(s). 2018

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. 2 — Synthesis procedure of the Cu₂O-TiO₂ NTA heterojunction films. a Step 1, anodic TiO₂ NTAs. b Step 2, fill the tubes with precursor solution. c Step 3, sintered the filled tubes at 400 °C to get the Cu₂O-TiO₂ NTA heterojunction. d Chemical reaction formula of the sintering process