Fast preparation of optical sensor for sulfur dioxide detection using the sol-gel route

This article outlines the preparation of nanohybrid materials for a sensor designed to detect sulfur dioxide in a solution using the sol-gel technology. It details the methods and optimal conditions for fabricating these materials. The properties of the resulting materials are analyzed at the molecular level, and the origins of these properties are elucidated. Obtained sensors demonstrate a linear relationship with sulfur dioxide concentration in standard gas samples within the range of 0.001% to 10%. An optimal dye concentration of 0.005 mol/l was identified for the preparation of sulfur dioxide gas detection sensors. Furthermore, the effects of various solvents, including ethanol, n-propanol, isopropanol, n-butanol, and isobutanol, were investigated during the sol-gel preparation to assess their impact on sensor performance. Optical sensor materials prepared with isobutanol as a solvent exhibited superior results in terms of the morphology and stability of the immobilized film. Moreover, the effect of various gases on the performance of the sensor produced by the sol-gel method was also investigated. CO and Cl2 showed no interference with the sensitivity of the sulfur dioxide sensor, while CO2 had a minor effect due to its acidic nature.

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