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. 2017 Apr 1;17(4):747. doi: 10.3390/s17040747

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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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(a) Steps of the sensor preparation procedure; (b) Picture of the sensors cell with four sensors. H₂TPPCOOH: 5-(4’-carboxyphenyl)-10,15,20-triphenylporphyrinato; CoTPPCOOH: H₂TPPCOOH metal complex with cobalt(II); CuTPPCOOH: H₂TPPCOOH metal complex with copper; ZnTPPCOOH: H₂TPPCOOH metal complex with zinc.