Transition metals doped zeolites for saw based CO2 gas sensor applications

摘要

A surface acoustic wave based CO₂ gas sensor that utilizes zeolites or transition metals doped zeolites as a sensing layer. Such zeolites can be used "as is" or doped with metal oxide semiconductor materials such as, for example, TiO₂, ZnO, SnO₂, electrolytes etc. to vary the sensor sensitivity for various gases. Zeolites can be configured as thin or thick films by employing nanopowders in suitable dispersants. The addition of zeolites, catalytically modified with chromium, results in a controlled selectivity to various gases based on shape and size effects.