Structural, morphological and optical characterization of nanocrystalline WO3 thin films

This study investigates the structural and optical properties of MgO:SnO2 nanoparticles using the Chemical precipitation method, The thin films were deposited by the spin coating technique on glass substrates. X-ray diffraction analysis proved the crystalline structure of prepared thin films, with the peaks corresponding to the (110), (101), (200), (211), and (220) planes, with the tetragonal SnO2 crystal structure, Fourier transforms infrared (FTIR), and scanning electron microscope (SEM) used to characterize the functional groups, shape, and dimensions of synthesized metal oxide nanoparticles. The optical properties of the films were studied by UV-Vis spectroscopy, and the bandgap energy was estimated to be in the range of (3.9 - 3.4 eV). The refractive index and extinction coefficient of the films were also determined, and the results indicated that the films had good transparency in the visible region, The study concludes that MgO:SnO2 thin films obtained by spin coating technique have potential applications in optoelectronics and gas sensors.

Section: Figure 2 Ftir Curve Of Synthesized Samplessupporting

confidence: 89%

Enhancements of Structural and Optical Properties of MgO: SnO2 Nanostructure Films

Ayoub,

AL-Timimi,

Abdullah

2023

“…The relationship between the energy gap and absorption coefficient can be described by the Tauc plot, which is a method used to determine the optical properties of materials based on their absorption spectra [32]. The Tauc plot shows a linear relationship between the square of the absorption coefficient and the photon energy for direct bandgap materials, while indirect bandgap materials show a nonlinear relationship [33]. The refractive index and extinction coefficient are important optical parameters that can be used to characterize the optical properties of thin films.…”

Section: Resultsmentioning

confidence: 99%

Effect of ZnS and CdS on Some Physical Properties of MgO Films

Hassan,

Albanda,

Al-Timimi

2023

This article reports on the fabrication and characterization of MgO nanostructured films and the effect of ZnS and CdS on their structural, optical, and electrical properties. The MgO, MgO: ZnS, and MgO: CdS thin films were deposited using a Chemical spray pyrolysis technique onto glass substrates at 673 K. The XRD patterns revealed that the MgO thin films had a preferred (111) orientation with a pure cubic crystalline structure, while the ZnS and CdS layers had a hexagonal structure. The FE-SEM images showed that the MgO films had a nanostructured morphology with an average particle size of ~50 nm. The UV-Vis spectroscopy results showed that the addition of ZnS and CdS layers to the MgO films resulted in a shift in the absorption edge towards the visible region of the electromagnetic spectrum, indicating an improvement in their optical properties. These findings suggest that the MgOZnS and MgOCdS films could have potential applications in optoelectronic devices.

“…The increased number of electrons also leads to an increase in particle size, as larger particles are needed to accommodate all of the electrons [45]. The following equation can be used to calculate the energy gap for the as-prepared films [46] :…”

Section: Optical Propertiesmentioning

confidence: 99%

Influence of Thickness on Some Physical Characterization for Nanostructured MgO Thin Films

Al-Timimi,

Albanda,

Abdullah

2023

MgO Nanostructured thin films with different thicknesses (200, 400, and 600 nm) have been deposited by the chemical spray pyrolysis technique. The results confirm that the structure, morphology, optical, and electrical properties were all affected by the thickness of the film. MgO films' physical properties were examined using (XRD), (FE-SEM), (EDX), (AFM), (UV-Vis spectrophotometer), and the Hall Effect. According to the structural analysis, the films have a cubic magnesium oxide polycrystalline structure, with a preferred orientation (002). The average Crystalline Size and optical band gap are found in the range (20.79-18.99) nm and (3.439-3.162) eV respectively with an increase in thickness. The surface morphology of the films reveals that they are free of crystal defects such as holes and voids, as well as homogeneous and uniform. The EDS patterns show that the as-grown films contain magnesium and oxygen. The Hall Effect shows that electrical conductivity decreases with thickness. The experimental results show that film thickness influences the physical properties of as-grown MgO thin films and that thicker films can be used as an absorber layer in solar cell applications.