Materials Science, Polymers and Plastics, Sensory Systems
4
Scopus Publications
Scopus Publications
The effect of aluminum doping on nanostructured CdS: optical, structural and sensing characterization , H. R. Shakir, O. A. Chichan, , M. S. Sada, , S. A. Hussein, , S. S. Chiad, , N. F . Habubi, , Y. H. Kadhim, , M. Jadan, and Chalcogenide Letters, 2025 CdS, and CdS: Al were grown onto glass bases via Chemical spray pyrolysis (CSP). XRD analysis of CdS films indicates a polycrystalline hexagonal structure with a predominant orientation of the (101) plane. The strain decreased from 28.55 to 25.66, and the grain size of undoped CdS films was around (13.51–12.14) nm as Al content rose. According to the results of AFM, CdS, CdS:2% Al, and CdS:4% Al all exhibit smooth surfaces with decreasing particle size in the range of (78.46), (69.75), and (42.20) nm, respectively. The root-mean-square roughness values for CdS and CdS:4% Al were 12.41 nm and 3.38 nm. According to AFM image, the surface roughness of CdS to CdS:4% Al were (9.74-5.16) nm. SEM images depict CdS films transitioning from flat islands (Undoped CdS) to uniform spherical nano-grains with Al doping. The result shows a decrease in absorption coefficient as Al content increased. The optical bandgap increased from (2.35-2.51) eV after doping. Results show that the extinction coefficient and refractive index are influenced by Al content. CdS film detects NO2 gas by resistance increase, impacted by Aluminum doping. Sensitivity decreases with an increase in Al doping in CdS films.
Effects of cadmium doping on the physical and sensing properties of nanostructured CuO thin films , H. R. Shakir, S. K. Dawood, , K. N. Hussein, , S. S. Chiad, , F. A. Jasim, , N. F. Habubi, , Y. H. Kadhim, , M. Jadan, and Digest Journal of Nanomaterials and Biostructures, 2024 This investigation used sol-gel deposition to create undoped CuO and CuO: Cd thin films. All films of undoped CuO and CuO: Cd phase exhibit four dominating peaks at 35.52°, 38.84°, 53.37°, and 68.23°, which are correspondingly assigned to the (022), (200), (020), and (220) planes, according to X-ray diffraction analysis. The dislocation density reduced from 60.55 to 49.94, the strain decreased from 26.98 to 24.60, and the grain size of the produced films measured by XRD was 12.85–14.15 nm. Atomic force microscopy (AFM) was used to study the morphology. SEM analysis showed increased aggregation with higher Cd content, resulting in a more uniform porous structure. The optical band gap decreases for all samples as the cadmium content increases, ranging from 2.28 to 2.14 eV. Similarly, the refractive index and extinction coefficient values decrease as the cadmium content increases for all samples. The gas sensor detects H2 (375 ppm) using CuO film cadmium doping, which enhances sensitivity, CuO: 4% exhibits highest resistance. Sensitivity decreases with higher doping, indicating reduced sensor responsiveness.
Characterizations of sprayed TiO2 and Cu doped TiO2 thin films prepared by spray pyrolysis method , F. H. Jasim, H. R. Shakir, , S. S. Chiad, , N. F. Habubi, , Z. S. A. Mosa, , Y. H. Kadhim, , M. Jadan, and Digest Journal of Nanomaterials and Biostructures, 2023 TiO2 and TiO2:Cu films were deposited by spray pyrolysis (SP). X-ray diffraction reveals that deposited films have a polycrystalline structural. The AFM image of the surface reveals that roughness and root mean square affected by doping. Optical transmission of films was found to decrease from 94 % to 84 % with the as the doping percentage increase to 3. Optical bandgap (Eg) of TiO2 thin film was 3.947eV. The bandgap is shifted to lower energies upon doping.
