Titanium dioxide sensor for measuring e.g. ammonia, has electrodes that are arranged on coating to measure resistance as measure for gas concentration, and other coating directly arranged under former coating to form heterostructure

摘要

The sensor has a layer on a substrate and electrodes, where the layer is made of two coatings of titanium dioxide. The electrodes are arranged on one coating that forms a sensor surface and faces an expansion space for measuring electrical resistance of the layer as a measure for gas e.g. ammonia, concentration. One coating has catalytically effective nano-particles within the region of the grain boundaries, and the other coating has alkaline-metal ions on intercalation-places and is directly arranged under the former coating, so that the layer is formed as a heterostructure. An independent claim is also included for a method of manufacturing a sensor for measuring reducing gases, in particular of hydrogen by coating a substrate with a sol-gel-process.