Preparation of Gas-Sensing Thin Sr²⁺-Doped YFeO₃ Films

Nanocrystalline undoped and Sr²⁺-doped YFeO₃ has been prepared by sol–gel synthesis. Its structure and elemental composition have been determined by X-ray diffraction and X-ray microanalysis. Thin films of the synthesized nanopowders have been produced on the surface of silicon substrates by spin coating. Surface resistivity measurements in air and in the presence of the gases to be detected have demonstrates that the materials thus prepared have a sensor response to NH₃ and CO. The concentration of the gases was 50 ppm, and the sensor signal exceeded 50%.