Abstract: A gas sensor for determining gas components in gas mixtures, e.g., for exhaust gases of internal combustion engines, includes a housing and a sensor element configured as a field effect transistor which has source, drain, and gate electrodes applied on a semiconductor substrate. A porous, catalytically active material is provided inside the housing of the gas sensor.

Abstract: A sensor element of a gas sensor for determining gas components in gas mixtures is provided, which includes a field-effect transistor having a source electrode, a drain electrode, and a gate electrode. The gate electrode includes a gate metallization, which is in contact with an insulation layer or a semiconductor substrate of the field-effect transistor via a boundary layer, the boundary layer being formed by modifying the surface of the insulation layer or the semiconductor substrate using metal alkoxides, metal amides, metal halogenides and/or metal alkyls. Furthermore, a method for producing said sensor element is provided.

Abstract: A gas sensor for determining gas components in gas mixtures, e.g., for exhaust gases of internal combustion engines, includes a housing and a sensor element configured as a field effect transistor which has source, drain, and gate electrodes applied on a semiconductor substrate. A porous, catalytically active material is provided inside the housing of the gas sensor.

Abstract: A filter device and a method for cleaning gas mixtures containing particles, e.g., soot-containing exhaust gases of internal combustion engines, as well as a method for the manufacture of the filter device, are provided. The filter device has a porous surface made of a filter base material exposed to the gas mixture to be cleaned. A layer of ceramic fibers is applied onto the surface exposed to the gas mixture to be cleaned.