Abstract
The goal of the work is to create a gas sensor by employing nanostructured thin films of both pure CdO and (Zn:Cu) co-doped CdO. The study examines the effects of layer number and varying Zn:Cu concentration ratios on gas sensing characteristics. Sol-Gel spin coating method was used to create pure and (Zn:Cu) weight percentage co-doped CdO thin films on glass substrates, which were then annealed for an hour at 475 °C.
All prepared samples were analyzed using X-ray diffraction (XRD), Raman spectroscopy, Field Emission-Scanning Electron Microscopes (FE-SEM), cross-section, Energy Dispersive X-ray spectroscopy (EDS), Atomic Force Microscopy (AFM), UV–Visible spectroscopy, photoluminescence (PL), Hall Effect measurements, and gas sensing performance using N2O as a oxided gas and H2S as reduced gas.
XRD measurements showed that, all prepared films of pure and (Zn:Cu)% co-doped CdO with equal and different ratios have a polycrystalline nature with a cubic structure and the preferred orientation
(111). The (Zn:Cu) co-doped CdO films with high ratio of Zn and Cu show markers associated with ZnO oxide and CuO oxide. The crystalline size of all prepared films were calculated using the Scherrer’s formula and W-H method. The crystallite size values calculated from Scherrer’s formula increased with increasing layers and decreased with (Zn:Cu) co- doping CdO. In addition, the results obtained from W-H method exhibited a similar trend in the crystallite size calculated from Scherrer’s formula. Raman spectra studies showed that the peaks of pure CdO films located at approximately at (329, 570, 810, and 1080 cm−1). Furthermore
