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. 2014 Jul 1;14(7):11629–11639. doi: 10.3390/s140711629

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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 3. — (a) Schematic diagram showing the sensing mechanism for untreated (hydrophobic) Parylene C (left) and oxidized Parylene C (right) sensing membranes; (b) Filtered data indicating chemical sensitivity of the sensor at distinct pH values; (c) Hysteresis characteristics (unfiltered data); (d) (Left axis) I_D−V_GS curves of sensor. (Right axis) Corresponding measured leakage currents; (e) Drift trends of a single sensing site under electrolytes of pH 4, 7 and 10. Markers indicate the experimental data and lines the corresponding fitting (exponential) curves.