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. 2017 Apr 7;12:262. doi: 10.1186/s11671-017-2030-z

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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. 1 — Schematic diagram of a step-like thickness gradient WO₃ film and the sulfurized WS₂ films on Al₂O₃ and SiO₂/Si substrates. Water contact angle (CA) images show different CAs on different substrates for 1.4 monolayer of WS₂