Thin Films of Cadmium and Dysprosium Oxides as Gas-Sensitive Elements of Sensors

Polycrystalline nanofilms of Dy₂O₃ and CdO are prepared by hydropyrolysis from aqueous solutions of dysprosium and cadmium nitrate salts. The surface morphology of the films and their polycrystalline structure are investigated by X-ray diffraction and electron microscopy. The synthesis of powders is performed by thermolysis of aqueous solutions of cadmium and dysprosium nitrates. The sequence of formation and crystallization of oxide phases of CdO and Dy₂O₃ is ascertained from the X-ray powder diffraction data. The temperature dependence of the electrical resistance of the films obtained is studied in air and argon atmosphere.