| 摘要 |
PCT No. PCT/DE94/01051 Sec. 371 Date Apr. 12, 1996 Sec. 102(e) Date Apr. 12, 1996 PCT Filed Sep. 14, 1994 PCT Pub. No. WO95/10774 PCT Pub. Date Apr. 20, 1995A sensor is proposed for detecting nitrogen oxides (NO, NO2, N2O4) in a test gas, having a semiconducting metal oxide layer (3) which is deposited on a ceramic substrate (10) and whose electrical resistance provides information about the concentration of nitrogen oxides (NO, NO2, N2O4) in the test gas. The main components of the sensor are a converter layer (4) which is deposited on the metal oxide layer (3) and is made of a material which causes the oxidation of combustible components of the test gas and converts the nitrogen monoxide (NO) contained in the test gas into nitrogen dioxide (NO2) or dinitrogen tetroxide (N2O4), which then reaches the metal oxide layer (3), as well as a heating device (5) which heats the metal oxide layer (3) and the converter layer (4). The converter layer is suitably constituted of titanium oxide (TiO2) and/or zirconium oxide (ZrO2) and/or silicon oxide (SiO2) and/or aluminum oxide (Al2O3) and has a platinum content of from 0.01 to 20 weight percent.
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