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. 2020 Mar 16;11(3):311. doi: 10.3390/mi11030311

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© 2020 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) The transmittance of WO₃ films prepared using the sample solution with 25% volume fraction glycerol annealed at different temperatures. The transmittance of air is specified as 100%. (b) The curve of (αhν)^1/2 versus hν for WO₃ films.