Структурные и газочувствительные характеристики тонких полупроводниковых пленок PdO различной толщины при детектировании озона

PdO films were obtained by thermal deposition of palladium metal with a thickness of 30 and 90 nm, followed by its oxidation in air at different temperatures. PdO oxide films are characterized by transmission electron microscopy (TEM) and reflection high-energy electron diffraction (RHEED). Data on the semiconductor properties and gas sensitivity to different concentrations of ozone in the air are obtained. The optimal temperature conditions for the oxidation of the films are established, which ensure their uniform phase composition and the absence of electrical noise during the detection of gases. The mechanism of the electrical noise appearance in ultrathin films associated with their fragmentation during oxidative annealing is proposed and justified. The possibility of detecting ozone impurities in the air below the maximum permissible concentration (MPC) by PdO semiconductor films is shown.

Stability of ceramics based on ZrO2 doped with Y2O3 under hydrothermal action

The article investigates the influence of hydrothermal action on the physical and mechanical properties of ceramics ZrO2 - 3 mol. % Y2O3. A comparison of the properties of samples sintered at 1350 °C in an air atmosphere and at 1850 °C in a vacuum, followed by oxidative annealing at 1200 °C in an air atmosphere, is carried out. It has been shown that the characteristics of specimens sintered at 1850 °C practically do not change after hydrothermal treatment, whereas in specimens sintered at 1350 °C, there was a significant drop in strength and hardness, by about 40-50 %.

A facile synthesis of CuFeO2 and CuO composite photocatalyst films for the production of liquid formate from CO2 and water over a month

A single CuFeO2/CuO sample is thermally healed by recycling weekly via oxidative annealing, producing formate continuously for 35 d.