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초록·키워드
With the rapid advancement of elastic and translucent optoelectronics, the demand for low-cost materials has emerged as a major research topic. As a result, this paper investigated how Al<sub>2</sub>O<sub>3</sub> incorporation altered the properties of PVC. New PVC/xAl<sub>2</sub>O<sub>3</sub> (x = 0, 0.01, 0.03, 0.07, 0.1, 0.2 wt%) nanocomposites were manufactured by using a cost-effective and simple process (casting method) to adjust the Al<sub>2</sub>O<sub>3</sub> concentration. The PVC/xAl<sub>2</sub>O<sub>3</sub> (x = 0, 0.01, 0.03, 0.07, 0.1, 0.2 wt%) nanocomposites were analyzed using X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), scanning electron microscopy (SEM), ultraviolet-visible (UV-visible) spectroscopy, and impedance measurements. Dislocation density (δ), Distortion parameter (g), nanoparticle size (D), and lattice strain (ε) were assessed using the Scherrer and Williamson-Hall methods. Crystal size and the number of crystallites were observed to increase with Al<sub>2</sub>O<sub>3</sub> content, revealing the higher crystallinity in the material. It was found that the particle size was ~ 30.22 nm for PVC/xAl<sub>2</sub>O<sub>3</sub> (x = 0.1wt%). SEM analysis showed a consistent distribution of Al<sub>2</sub>O<sub>3</sub> within the PVC at low concentrations of Al<sub>2</sub>O<sub>3</sub>. These PVC/Al<sub>2</sub>O<sub>3</sub> films were used as adjustable light- diffusing films in the packaging of different flexible photoelectric devices, according to their visible absorbance characteristic depending on filler concentrations. The optical bandgaps of PVC and PVC/x(Al<sub>2</sub>O<sub>3</sub>) (where x = 0.2) were 5.05 eV and 3 eV, respectively. This decrease was associated with the creation of localized states in the bandgap. The refractive index values obtained were greater than those found in earlier studies, suggesting that the incorporation of a small amount of Al<sub>2</sub>O<sub>3</sub> nanoparticles improved the refractive index of PVC. It was noted that as the concentration of Al<sub>2</sub>O<sub>3</sub> rose, the dispersion parameters E<sub>d</sub>, M<sub>2,</sub> and M<sub>3</sub> showed an increase, while E<sub>0</sub> exhibited a decrease. Conversely, the dielectric characteristics of the synthesized nanocomposites improved as the alumina content in the PVC matrix increased. The findings concluded that inexpensive PVC/xAl<sub>2</sub>O<sub>3</sub>(x = 0.1wt%) nanocomposites can be used as an essential component in sophisticated optoelectronic applications.
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