Dopde Thin-Film Sensors Via a Sol-Gel Process for High-Acidity Determination

摘要

AN optical sensor has been developed for high-acidity ([H~+]=1-11 M) measurements. The sensor is made of thin films of silica sol-gels doped with an acid indicator. Acid-and base-catalyzed methods to make the sol-gel films have been studied, and the properties of the sol- gel sensors prepared by these methods are discussed. The acid-catalyzed method was found to give more robust films and has been optimized to prepare thin films which are mechanically and chemically stable for a period of at least 3 months.