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. 2017 Apr 26;9(5):155. doi: 10.3390/polym9050155

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Schematic diagram of fabrication methods for paper-based free chlorine sensor strip based on PEDOT/PSS. (a) First, drawing of film as sensing active layer by using a pen filled with PEDOT/PSS solution; (b) second, drawing of electrodes with silver paste; (c) protecting the Ag electrodes from water with petroleum jelly; (d) photograph of manually prepared sensor kit; (e) sensing responses with different free-chlorine concentrations; (f) Storage stability. Reprinted with permission from [75]. Copyright 2016, American Chemical Society.