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. 2014 Sep 3;14(9):16343–16422. doi: 10.3390/s140916343

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 51. — Impedance variation with relative humidity at different frequencies for different doped sensor materials: (a) undoped ZrO₂ [171]; (b) Y³⁺-doped ZrO₂ [172] humidity sensors.