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. 2011 Feb 1;11(2):1907–1923. doi: 10.3390/s110201907

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© 2011 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 8. — The comparative effect of the molal ratio of H₂O/TMOS in the LSPR sensing probe with SiO₂ sol-gel coating in detecting the HF solution (3.0%) at R = 4, R = 10, and R = 15, respectively (the formation of bulk SiO₂ of 4.5 mm diameter, at pH = 4, after standing for 3 days).