Enhanced the Structural, Dielectric Constants, and Linear/Non-linear Optical Properties of PVB/Gd2O3 Nanocomposites for Flexible Optoelectronics
摘要
This study explores the influence of different concentrations of Gd2O3 nanoparticles NPs (0, 0.5, 1, 2, and 3 wt%) on the structural properties, dielectric constants, and linear/non-linear optical features of PVB/Gd2O3 nanocomposite films. The Gd2O3 NPs were synthesized using the co-precipitation method, and PVB/Gd2O3 nanocomposite films were produced using solution casting. XRD and FTIR spectra confirmed the successful synthesis of PVB + x wt% Gd2O3 nanocomposites. The direct band gap for Gd2O3-doped PVB nanocomposites decreased from 5.14 eV to 4.48 eV with increased concentrations of Gd2O3 NPs in PVB nanocomposites from 0 wt% to 3 wt%., respectively. Meanwhile, the value of EU for Gd2O3-doped PVB nanocomposites increases from 0.714 eV for pure PVB to 1.725 eV for PVB + 3 wt% Gd2O3 nanocomposite. Additionally, the oscillation energy Eo enhanced from 6.8468 eV to 8.30 eV, and the dispersion energy Ed showed a higher value of 16.33 eV for PVB + 3 wt% Gd2O3 film compared to 7.24 eV for PVB. Furthermore, the static refractive index (no) was increased from 1.43 for PVB pure to 1.72 for PVB + 3 wt% Gd2O3 film. The static dielectric constant εs also enhanced from 2.05 to 2.96 with increasing the Gd2O3 ratio. Besides, the free carrier concentration (N/m∗) varied between 2.26 × 1055 Kg−1.m−3 and 5.63 × 1055 Kg−1.m−3. In the same context, the nonlinear optical parameters χ(3) increased from 4.5464 × 10−14 esu to 2.9247 × 10−13 esu, and the n2 enhanced from 1.1941 × 10−12 esu to 6.3996 × 10−12 esu as the Gd2O3 concentration increases. The optical conductivity rose from 9.11 × 108 S/cm2 for PVB to 2.01 × 109 S/cm2 by adding 3%wt Gd2O3 NPs to PVB. Overall, the structural, dielectric constants, linear, and non-linear optical properties of PVB/Gd2O3 nanocomposites are candidates for flexible optoelectronic applications.