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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 27. — Response and recovery times of different silicon based materials: (a) high response (during humidification) and recovery (during desiccation) times showed by a 15 cp silica aerogel sensor at 25 °C and 1 kHz [110]; (b) low response but high recovery time shown by Fe-SBA-15(0.5) from 11% to 95% RH measured at 100 Hz; the inset represents a schematic f response measuring equipment [119]; (c) high response and recovery time shown by nw-SiC/Si-NPA in between 11% and 95% RH at a constant frequency of 100 Hz [116]; (d) very low response and recovery times shown by a MgO-SBA-15(R = 1) sample [124].