فهرست نشریات علمی دسترسی آزاد ایران

The study details the synthesis of un-doped and gallium-doped zinc oxide (GZO) (2, 4 and 6) wt% nanoparticles (NPs) via the hydrothermal approaches at a reaction temperature and time of 160 °C and 5 hours respectively. Furthermore, ZnO-polystyrene (PS) and GZO-PS nanocomposite (NCs) films were fabricated using the casting method. The results of X-ray diffraction revealed that both ZnO-PS and GZO-PS nanocomposite films exhibit polycrystalline structures of the ZnO hexagonal wurtzite phase. A broad and low-intensity peak was observed at diffraction angles of approximately (15-23)° related to the noncrystalline peak of polystyrene polymer. The crystalline size and the microstrain were determined utilize the Scherrer and Williamson-Hall methods, showing an increase (26-34) nm and variation with the rise in Ga content. The presence of functional groups in polymer systems was confirmed through (FTIR) spectral analysis. The topographical characteristics of the prepared nanocomposite films indicated that both the roughness and root mean square (r.m.s) roughness increased from 1.89 to 2.31 nm and from 1.54 to 1.87 nm, respectively, with an increase in Ga dopant content. The surface morphology of Zn-PS and GZO-PS nanocomposites revealed nanostructured grains formed by agglomerated particles in the samples. Additionally, varying Ga dopant content altered the density and shape of these unstructured grains. The particle sizes were determined from the corresponding FESEM images, which were about 42 and 46 nm for ZnO-PS and GZO-PS nanocomposites respectively. The GZO-PS nanocomposite clearly demonstrated that the particles are well dispersed within the PS polymeric compounds. The optical absorption edge of ZnO-PS red-shifted and the forbidden direct energy band gap reduced from 4.4 eV to 3.74 eV at a Ga content of 6 wt %. Furthermore, photoluminescence studies of the produced nanocomposite films demonstrated bright blue light emission. The incorporation of GZO nanoparticles into a polystyrene (PS) matrix led to the formation of a nanocomposite exhibiting continuous and intense blue emissions. The integration of GZO nanoparticles into a PS matrix resulted in the creation of a nanocomposite that displays continuous and vibrant blue emissions.