A SOLID STATE SENSOR FOR CARBON MONOXIDE

摘要

A molybdenum, tungsten or vanadium salt-palladium, ruthenium or osmium salt composition for CO detection is made reversible by addition of ferric, chromium (VI) or cerium (IV) ion. The system is made more CO specific by adding an interference control salt which forms white or colorless precipitates with interfering species. The operational and shelf life are extended by a mixture of counterions which prevent reduction of the catalyst; the acetate counterion is particularly useful as a redox property modifier. In a solid state optical sensor for CO, the chemistry is contained in a polymer embedding matrix, with permeation enhancer, if required. Solubility of the chemistry in the polymer matrix is enhanced by introducing lipophilic counterions. The matrix with embedded sensing chemistry is coated on an optical support to form an optical transducer which may be an interference type transducer.