Low Temperature Chemoresistive Oxygen Sensors Based on Titanium-Containing TiCT and TiCT MXenes.

The chemoresistive properties of multilayer titanium-containing TiCT and TiCT MXenes, synthesized by etching the corresponding MAX phases with NaF solution in hydrochloric acid, and the composites based on them, obtained by partial oxidation directly in a sensor cell in an air flow at 150 °C, were studied. Significant differences were observed for the initial MXenes, both in microstructure and in the composition of surface functional groups, as well as in gas sensitivity. For single TiCT and TiCT MXenes, significant responses to oxygen and ammonia were observed.

Gas-Sensitive Properties of ZnO/TiCT Nanocomposites.

At present, a new class of 2D nanomaterials, MXenes, is of great scientific and applied interest, and their application prospects are very broad, including as effective doping components for receptor materials of MOS sensors. In this work we have studied the influence on the gas-sensitive properties of nanocrystalline zinc oxide synthesized by atmospheric pressure solvothermal synthesis, with the addition of 1-5% of multilayer two-dimensional titanium carbide TiCT, obtained by etching TiAlC with NaF solution in hydrochloric acid. It was found that all the obtained materials have high sensitivity and selectivity with respect to 4-20 ppm NO at a detection temperature of 200 °C.

Obtaining of ZnO/FeO Thin Nanostructured Films by AACVD for Detection of ppb-Concentrations of NO as a Biomarker of Lung Infections.

ZnO/FeO nanocomposites with different concentration and thickness of the FeO layer were obtained by two-stage aerosol vapor deposition (AACVD). It was shown that the ZnO particles have a wurtzite structure with an average size of 51-66 nm, and the iron oxide particles on the ZnO surface have a hematite structure and an average size of 23-28 nm. According to EDX data, the iron content in the films was found to be 1.