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Go to Editorial ManagerThe mixture (CdS-CdSe) thin films were fabricated by the thermal evaporation technique under very low pressures with a deposition rate (R) of 0.2 nm/sec and a 400 nm thickness (TH). The photoelectric and thermal properties of these films have been studied at different base layer temperatures. It was found that there is a linear relationship between the base layer (substrate) temperature and photocurrent of these photosensitive films. There has been a very influential parameter on the samples, which is the substrate temperature (Ts), where the optimum Ts was (170 °C) with a high adhesion coefficient. The sample that was deposited at this Ts, has good properties compared to other samples. Also, there is a direct relationship between the surface current and the operating temperature for fabricated films. X-ray diffraction (XRD) tests were taken for fabricated films which have been identified as polycrystalline with hexagonal and cubic-phase structures with different directional roles. The dominant direction of CdS 002 and 111 for CdSe. Analysis for films that were fabricated at (210 oC) and (90oC) shows an excess of (S) and (Cd) respectively. This condition greatly affects the film resistivity. In future work, new and different results can be obtained using different preparation parameters.
In this study, Dielectric Barrier Discharge plasma irradiation (DBD) is applied to treatment and improve the properties of the ZnO thin film deposited on the glass substrate as a sensor for glucose detection. The ZnO is prepared via a sol-gel method in this work. ZnO is irradiated by the DBD high voltage plasma to improve of its sensitivity. The optical properties, roughness and surface morphology of the waveguide coated ZnO thin films before and after DBD plasma irradiation are studied in this work. The results showed a significant improvement in the performance of the sensor in the detection of concentrations of glucose solution after plasma irradiation. Where the largest value in sensitivity was equal to 62.7 when the distance between electrodes was 5 cm compared to the sensitivity before irradiation, which was equal to 92. The high response showed in results demonstrating that the fabricated waveguide coated ZnO after plasma irradiation has the excellent potential application as a sensor to detect small concentration of glucose solution.