Publications
PREPARATION AND CHARACTERIZATION OF NANO FILMS (PVP– CUO) FOR GAS SENSING APPLICATIONS
Oct 1, 2025Journal International Journal of Applied Mathematics
Publisher International Journal of Applied Mathematics
DOI https://doi.org/10.12732/ijam.v38i7s.506
Issue Vol. 38 No. 7s (2025)
Volume 38
Nano films were prepared from PVP particle-supported CuO In different proportions using casting technology. Results showed XRD and SEM That is an addition CuO It improved crystallization and reduced granular size with a more uniform surface. Hall's measurements also showed the transformation of films from semi-insulating to semiconductor p As resistance decreases and carrier concentration increases. Optical examinations showed a shift of the absorption peak towards larger wavelengths and a decrease in the energy gap from 4.2 to 3.5 eV. In gas sensitivity tests, a membrane was proven (PVP + 4% CuO) At 150°C Best performance with short response time and high sensitivity of 80.67%. These results confirm that integration CuO Inside a matrix PVP It enhances optical, electrical and surface properties, making these films strong candidates for gas sensor applications in industrial environments.
Effect of Manganese Alloying on the Structural and Optical Properties of Titanium Oxide (TiO2 ) Films Prepared by Pulsed Laser Deposition (PLD) Method
Mar 1, 2025Journal Nanosistemi, Nanomateriali, Nanotehnologii
Publisher Institute for Metal Physics (National Academy of Sciences of Ukraine)
DOI 10.15407/nnn.23.01.0109
Issue 1
Volume 23
The pure membranes of TiO2 and manganese Mn are prepared in propor- tions of 5, 3, 1 using the method of pulsed laser deposition (PLD), as the sedimentation process is carried out on glass bases at room temperature, and a thickness of 200 nm; here, the effect of manganese distortion on the structural and optical properties is studied, as the results of x-ray diffraction show that all the membranes are prepared as having a quater- nary based structure (tetragonal) as well as within the structural charac- teristics. The surface topography is studied with an atomic force micro- scope, and the results show a decrease in the values of surface roughness and mean square root of it with increasing the percentage of distortion; the values of the roughness rate are of 3.935–2.983 nm, but, through visual examinations, it is noted that the values of absorption and absorp- tion coefficient increase with increasing the percentage of distortion, while the optical energy gap decreases with increasing distortion with manganese as 3–2.25 eV
Effect of adding yttria-stable zirconia to the compound (Al-Cr) on the hardness and porosity of the coating prepared by thermal spraying technique
Feb 10, 2024Journal AIP Conference Proceedings
Publisher AIP Conference Proceedings
DOI https://doi.org/10.1063/5.0181853
Volume 2885
Abstract. Then an initial thermal treatment was performed for the powders of the composite Cermet materials before the coating process at (150 oC) temperature for (1hr), and after the coating process the thermal treatment was performed at (600 oC) and for a time (1.5 hr), where a study was carried out in this research Solidity and porous examinations and SEM examinations showed that the addition of the sedentary zirconia in the bacteria leads to an increase in the values of the solidity, where the ratio of Vickers hardness before the sintering process ranged from Hv (124.5-159.6) as it was the highest value of Vickers solidity Before the sintering (159.6Hv) at 15% YSZ and after this percentage Vickers salad began to decline to (155.3.6Hv) at 20% YSZ and after the thermal process Vickers salad values between (135.3- 181.6)Hv was the highest and best value (181.6Hv) at 15% YSZ and after this ratio Vickers salad began to decline to (173.4Hv) at 20% YSZ. Porosity was better and less valuable to porous before thermal sintering (8.33%) at 15% YSZ ,Then it also started with an increase to (10.347%) at 20% YSZ, and after the process of thermal warming where it was better and lower (7.237%) at 15% YSZ but when the content of the zirconia stable with the bacteria increased YSZ also began to increase porous at 20% YSZ the porosity rate increased to (9.235Hv) and the most detailed tests for the SEM test were at 15% YSZ where the paint appeared more coherent, homogeneous and less porous.