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Original Articles

HIGH-ACIDITY OPTICAL SENSORS BASED ON SOL-GEL-DERIVED THIN FILMS

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Pages 1603-1616 | Received 11 Jan 2001, Accepted 05 May 2001, Published online: 02 Feb 2007
 

Abstract

Optical sensors have been developed for high-acidity ([H+] = 1–9 M) measurements. The indicators Rhodamine B and Safranine T were entrapped in porous silica glass films prepared by the sol-gel method. The entrapped indicators were nonleachable and respond to high acid concentrations in a reversible manner. The influences of different experimental parameters such as the catalyst concentration, the water/tetraethoxy silane ratio, the amount of co-solvent, and the amount of surfactant on the chemical and mechanical stabilities of the sol-gel films were investigated. The optical sensors possess a short response time of < 5 s and are stable for a period of at least 3 months. The relative standard deviation of the absorbance measurements is < 2%. The interfering effect of different alkali, alkaline earth and transition metal salts on the response behavior of the sensors was studied.

Acknowledgments

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