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. 2017 Dec 6;17(12):2826. doi: 10.3390/s17122826

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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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Stern–Volmer plots of the different sensors fabricated employing (a) PDDA, (b) PEI, and (c) PAH as cationic polyelectrolytes, and PAA as a spacer layer. In the cases of (a) PDDA and (b) PEI, the maximum of the sensitivity is achieved when luminescent layers are spaced by five layers of polyelectrolytes, whereas in the case of (c) PAH, only three layers of polyelectrolytes are necessary to achieve the maximum of the sensitivity. Reprinted from [48] with permission from Elsevier.

Stern–Volmer plots of the different sensors fabricated employing (a) PDDA, (b) PEI, and (c) PAH as cationic polyelectrolytes, and PAA as a spacer layer. In the cases of (a) PDDA and (b) PEI, the maximum of the sensitivity is achieved when luminescent layers are spaced by five layers of polyelectrolytes, whereas in the case of (c) PAH, only three layers of polyelectrolytes are necessary to achieve the maximum of the sensitivity. Reprinted from [48] with permission from Elsevier.