Novel Mesoporous Filters for Selective Gas Absorption
Résumé
Semiconductor gas sensors have a proven potential for low cost and highly sensitive gas detection. However, selectivity remains one of the main problems for many applications. In this paper we report a new kind of mesoporous ceramic filter with nanoscale pores. The ceramic filter offers mechanical protection and can help to boost selectivity enomously through selective gas absorption. The developed nano-technological filters are based on mesoporous secondary and ternary silicon nitride derivatives with a defined particle size and are prepared via a new sol gel route. The interaction of the filters with CO, NO2 , H2 and propane were evaluated using broad-band sensors. Highly selective absorption was observed for different gases, especially NO2. From these experiments a filter efficiency value is calculated which allows easy selection of suitable filter materials for different applications.
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