Photosensitization of optical band gap modified polyvinyl alcohol films with hybrid AgAlO2 nanoparticles

Somesh, T. E.; Al-Gunaid, Murad Q. A.; Madhukar, B. S.; Siddaramaiah,

doi:10.1007/s10854-018-0226-3

Cited by 44 publications

(12 citation statements)

References 35 publications

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“…This boost in the value of the static refractive index by nanofiller addition is consistent with the previous studies. It is likely ascribed to the enhancement of bond strength and dipole strength due to the creation of space charges in the presence of the Al complex [ 56 ].…”

Section: Resultsmentioning

confidence: 99%

Characteristics of Poly(vinyl Alcohol) (PVA) Based Composites Integrated with Green Synthesized Al3+-Metal Complex: Structural, Optical, and Localized Density of State Analysis

et al. 2021

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The influence of dispersing Al-metal complex on the optical properties of PVA was investigated using UV–visible spectroscopy. Polymer composite films with various Al3+-complex amounts in the PVA matrix were arranged by solution casting technique by means of distilled water as a widespread solvent. The formation of Al3+-metal complex was verified through Ultraviolet–visible (UV-Vis) and Fourier-transform infrared spectroscopy (FTIR) examinations. The addition of Al-complex into the polymer matrix led to the recovery of the optical parameters such as dielectric constant (εr and εi) and refractive index (n). The variations of real and imaginary parts of complex dielectric constant as a function of photon wavelength were studied to calculate localized charge density values (N/m*), high-frequency dielectric constant, relaxation time, optical mobility, optical resistivity, and plasma angular frequency (ωp) of electrons. In proportion with Al3+-complex content, the N/m* values were amplified from 3.68 × 1055 kg−1 m−3 to 109 × 1055 kg−1 m−3. The study of optical parameters may find applications within optical instrument manufacturing. The optical band gap was determined from Tauc’s equation, and the type of electronic transition was specified. A remarkable drop in the optical band gap was observed. The dispersion of static refractive index (no) of the prepared composites was analyzed using the theoretical Wemple–DiDomenico single oscillator model. The average oscillator energy (Eo) and oscillator dispersion energy (Ed) parameters were estimated.

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Section: Resultsmentioning

confidence: 99%

Characteristics of Poly(vinyl Alcohol) (PVA) Based Composites Integrated with Green Synthesized Al3+-Metal Complex: Structural, Optical, and Localized Density of State Analysis

et al. 2021

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“…The absorption characteristics of PVA and its NC films are shown in Figure 7(a), different electronic transitions may occur in PVA. The absorption band at 230-250 nm is due to an unsaturated C=O of left over acetate groups in the structure of PVA and C=C existing in the polymer chains tail head (6) . Pristine PVA has one more absorption peak at 260-320 nm, which is noticeable, n→π*inter band transitions of oxygen atoms free electrons in polymer chains are ascribed to these peaks (42) .…”

Section: Absorption and Absorption Coefficientmentioning

confidence: 99%

“…Poly(vinyl alcohol) (PVA) has been widely utilized as a host polymer for various types of nanofillers among several synthetic polymers. Owed to its simple processability, biocompatibility, great film-forming character, hydrophilicity, excellent chemical resistance, relatively low cost, better aqueous solubility, transmittance, non-toxicity, noncorrosive nature, biodegradability and accessibility with different molecular weights (6) . PVA has high dielectric strength, great charge storage capacity, outstanding mechanical stability, environmental, thermal and chemically stable.…”

Section: Introductionmentioning

confidence: 99%

Polymer nanocomposites comprising PVA matrix and AgGaO2 nanofillers: Probing the effect of intercalation on optical and dielectric response for optoelectronic applications

Somesh¹,

Shivakumar²,

Sangamesha³

et al. 2021

IJST

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Objectives: Synthesis of hybrid nanoparticles (NPs) and intercalation of as prepared NPs inside polymer matrix to fabricate polymer nanocomposites (NC) and evaluate the optoelectronic properties. Method: A simple, time consuming solution combustion method was used to synthesize silver doped gallium oxide (AgGaO 2 ) NPs. The solution casting process was employed to prepare NC films of poly(vinyl alcohol) (PVA) with the inclusion of AgGaO 2 NPs as nanofiller. Finding: The analytical technique such as Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and differential scanning calorimetry analyses were used to analyze the PVA/AgGaO 2 NC films. The findings of various characterization approaches showed that the morphological, structural and thermal characteristics of PVA/AgGaO 2 NC films had improved, as well as confirms the existence of AgGaO 2 NPs in the PVA matrix. Furthermore, the dielectric characteristics of the PVA/AgGaO 2 NC films were studied using an LCR meter at various frequencies (50 Hz-1 MHz). With intercalating four different wt% of AgGaO 2 NPs content as 0.5, 1, 2 and 4 wt% the dielectric constant and dielectric loss of NC films with 4 wt % AgGaO 2 NPs incorporated were 112.1 and 51.5 respectively. Novelty: This improvement in dielectric characteristics revealed the uniform distribution and effective interaction of AgGaO 2 NPs with the active site of PVA chains. The preceding findings demonstrated that the obtained PVA NCs were promising materials for flexible energy storage and UV-shielding applications.

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“…In linked to a reduced crystal symmetry around the Gd ion, which is obtained through the use of nanoparticles or metal doping of the surface shell. The core of the doubly luminous nanoparticles is encased in a polysiloxane shell [17]. Compared to the covered or closed shell, nano-particles increase the luminescence properties.…”

Section: Introductionmentioning

confidence: 99%

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

Vedhavathi¹,

Divya²,

Madhukar³

et al. 2022

J Inorg Organomet Polym

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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.

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Photosensitization of optical band gap modified polyvinyl alcohol films with hybrid AgAlO2 nanoparticles

Cited by 44 publications

References 35 publications

Characteristics of Poly(vinyl Alcohol) (PVA) Based Composites Integrated with Green Synthesized Al3+-Metal Complex: Structural, Optical, and Localized Density of State Analysis

Characteristics of Poly(vinyl Alcohol) (PVA) Based Composites Integrated with Green Synthesized Al3+-Metal Complex: Structural, Optical, and Localized Density of State Analysis

Polymer nanocomposites comprising PVA matrix and AgGaO2 nanofillers: Probing the effect of intercalation on optical and dielectric response for optoelectronic applications

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

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