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Open AccessArticle

Response of Optically Transparent pH Sensing Films to Temperature and Temperature Variations

Department of Physics and Astronomy, Virginia Military Institute, Lexington, VA 24450, USA
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Coatings 2020, 10(1), 18; https://doi.org/10.3390/coatings10010018
Received: 30 September 2019 / Revised: 17 December 2019 / Accepted: 24 December 2019 / Published: 26 December 2019
There are numerous applications for thin films based chemical pH sensors, in such areas as biomedical, military, environmental, food, and consumer products. pH sensitive films fabricated through the ionic self-assembled monolayers technique were made of polyelectrolyte polyallylamine hydrochloride and the water-soluble organic dye molecule Direct Yellow 4. The films were monitored in various environmental conditions and for selected periods, at temperatures varying between −13.7 and 46.2 °C. Absorbance measurements and atomic force microscopy performed before and after thermal treatment indicate that for optimized thickness and composition the films maintain their functionality and are not affected by long-term exposure at these temperatures. View Full-Text
Keywords: thin films; optical pH sensors; ionic self-assembled monolayer; layer-by-layer assembly; dyes thin films; optical pH sensors; ionic self-assembled monolayer; layer-by-layer assembly; dyes
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Topasna, D.M.; Topasna, G.A. Response of Optically Transparent pH Sensing Films to Temperature and Temperature Variations. Coatings 2020, 10, 18.

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