PVA/Gd2O3@Zno Nanocomposite Films as New Uv-Blockers: Structure and Optical Revelations

Abstract

Herein we have synthesised Gadolinium oxide doped Zinc oxide (Gd2O3@ZnO) by solution combustion method and incorporated it as a nanofiller into Polyvinyl alcohol (PVA) polymer matrix using solution intercalation technique to get PVA/Gd2O3@ZnO nanocomposite film. The X-ray diffraction (XRD), Scanning electron microscopy (SEM), Differential scanning calorimetry (DSC) and UV-Vis spectroscopy were used to investigate the structural, morphological, glass transition temperature and optical properties of synthesized nanocomposites respectively. The optical propertiesof PVA/Gd2O3@ZnO film shows the interaction of -OH groups in PVA and dopant. From DSC, it is clear that Tg of prepared nano composites increases with increasing in dopant concentration. XRD analysis showed that the crystalline characteristics of the nanocomposites increases with increase in dopant concentration. The UV-Visible spectra reveals that there is decrease in indirect band gap of PVA from 4.94 eV to 3.12 eV and direct band gap from 4.90eV to 3.03 eV compared to pristine PVA Gd2O3@ZnO doped nanocomposite films showed multifold enhancement in optical characteristics such as refractive index of PVA doped nanocomposites compared pristine PVA, optical conductivity, finess coefficient, extinction coefficient on increasing in dopant concentration (0%, 2%, 4%, 6% and 8wt%). The optical characteristics of PVA/Gd2O3@ZnO nanocomposite films show excellent UV-blocking behaviour suggesting that, they are promising materials for optical devices.

Poly (o‐anisidine) Encapsulated K2ZrO3 Nano‐core based Gelatin Nano Composites: Investigations of Optical, Thermal, Microcrystalline and Morphological Characteristics

“…The first step weight loss occurred in the temperature range 29.09 °C–225.95 °C and is due to the evaporation of moisture and physisorbed water molecules corresponding to a weight loss in the range of 14.25 %. At the second stage, the thermal degradation occurred in the temperature range 225.95 °C–440.35 °C, with a major weight loss of 47.68 % corresponding to the dissociation of intermolecular and intramolecular hydrogen bonding and structural decomposition with the liberation of CO 2 , NH 3 , HCN, C 2 H 4 , and CH 4 due to the degradation of the protein [54] …”

“…At the second stage, the thermal degradation occurred in the temperature range 225.95 °C-440.35 °C, with a major weight loss of 47.68 % corresponding to the dissociation of intermolecular and intramolecular hydrogen bonding and structural decomposition with the liberation of CO 2 , NH 3 , HCN, C 2 H 4 , and CH 4 due to the degradation of the protein. [54] The third stage thermal degradation occurred in the temperature range 440.35 °C-655.96 °C was due to the decomposition of carbonaceous matter with a weight loss of 37.13 %. The thermal decomposition of pure gelatin and its POA@K 2 ZrO 3 nanocomposites show similar patterns and are presented in Figure 8.…”

Graphene nanoribbon doped PVA nanocomposites for improved UVC blocking and luminescence down‐shifting applications

“…Polymer nanocomposites have drawn immense attention of researchers from different fields due to their special properties such as light weight, low oxidation, ease of processability, long term stability and tailorable electrical, mechanical and electrochemical properties 1–5 . The incorporation of nanostructured materials as fillers into conventional polymers imparts extra‐ordinary characteristics that suit photonic and optoelectric applications 6 . They exhibit outstanding thermal stability and filler specific refractive index which make them potential candidates for optical storage applications 7 .…”

“…9 Therefore, the materials with UV blocking and luminescent down-shifting attributes are sought-after in photonic and photovoltaic device applications. 6,9 PVA is a hydroxyl rich biocompatible, non-toxic and inexpensive polymer extensively used in various application areas for its chemical stability, dielectric strength and promising optical features. 18 PVA also exhibits dopant dependant physical properties which openup a broader window for more advanced applications in photonics, optoelectronics and optical storage.…”

“…suit photonic and optoelectric applications. 6 They exhibit outstanding thermal stability and filler specific refractive index which make them potential candidates for optical storage applications. 7 The characteristics of polymer composites can be optimized through size, quantity and nature of dispersion of the filler in polymer matrix.…”