Explore the physical properties of the synthesized UiO-66, Zn-BiOBr, and Zn-BiOBr/UiO-66 heterostructures for optical applications

Abstract

The Zn-BiOBr/UiO-66 Heterostructures were prepared using a simple wet chemical method. Three heterostructures were prepared by varying the weight percentage of UiO-66 to Zn-BiOBr. The prepared materials' chemical compositions and phase structure were investigated using Fourier transform infrared (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Furthermore, the morphology was investigated via Field-emission scanning electron microscope (FE-SEM), energy dispersive X-ray (EDX), and elemental mapping techniques. The optical features were analyzed through UV–vis spectrophotometry. The bandgap energy was calculated using the Tauc equation and was found 4.24 eV for UiO66 and 2.17 eV for the ZnBiOBr composite. After combining the ZnBiOBr composite with the UiO66 material the bandgap energy of the composite decreased to 4.07, 3.94, and 3.75 eV after doping 10 %, 20 %, and 30 % UiO-66, respectively. Additionally, the refractive index of the Zn-BiOBr/UiO-66 heterostructure increases from 2.1520 for the UiO-66 composite to about 2.1929, 2.2254, and 2.2748 for 10, 20, and 30 % UiO66. Moreover, an enhancement was observed for other optical parameters like electronegativity, metallization, and optical conductivity. Besides, the W-DD model was used to investigate the nonlinear optical parameters, which showed an improvement in the first- and third-order nonlinear optical susceptibility, and nonlinear refractive index values with increasing UiO-66 content in the composite matrix.