Improvement Optical Properties of PVA/ TiO2 and PVA/ ZnO Nanocomposites

Mohammed, Nadheer Jassim; Rasheed, Zahraa S.; Hassan, Ashraf S.

doi:10.23851/mjs.v29i3.629

Cited by 24 publications

(6 citation statements)

References 5 publications

(9 reference statements)

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“…The index of refraction values became higher upon adding TiO2 NPs. Previous reports have shown the same behavior for PVA/TiO2 and PVA/ZnO nanocomposites [44]. This raise in the values makes them useful as antireflective coatings.…”

Section: Optical Characteristicssupporting

confidence: 73%

Structural, Thermal, Optical Characterizations of PANI/PMMA Composite Doped by TiO2 as an Application in Optoelectronic Devices

Alsulami¹,

Rajeh²

2021

Preprint

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The casting method was employed for the preparation of polymer blend films doped with TiO2 (0.5, 1, 1.5, and 2.3 wt.%). The XRD outcomes show that TiO2 phase formation is anatase, with an average crystal size of 20.25 nm. PANI/PMMA-TiO2 nanocomposites samples have an amorphous nature. In addition, the degree of amorphousity is increased with the increase of the content of the TiO2 NPs. The FTIR method was employed for presenting the vibrational bands of the nanocomposites and the intermolecular bonding of the blend with the TiO2 NPs. The applied investigation involved the optical constant like absorption as well as t90-etransmission spectra, refractive index, reflectance, coefficient extinction, dielectric constant’ imaginary and real parts, the susceptibility (χ3) of third order and the optical band gaps. The optical band gap (Eg) values of the films of fabricated nanocomposites was lower upon doping (≤ 1.5 wt.%). The reduction of the value happened due to the introduction of the preselected TiO2 NPs into thin films. Such values significantly match the values which were revealed by the Tauc technique. It was proved through DSC and TGA techniques that TiO2 NPs can lead to the enhancement of the polymer blend in terms of thermal stability. As displayed by the DSC analysis, there is a single Tg of the polymer blend (PANI/PMMA), which prove their miscibility. The optical constants displayed by the experimental results show noticeable changes upon raising the doping concentrations. The resultant doped thin films indicate that the fabricating high-efficient optoelectronic machines are greatly promising.

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Section: Optical Characteristicssupporting

confidence: 73%

Structural, Thermal, Optical Characterizations of PANI/PMMA Composite Doped by TiO2 as an Application in Optoelectronic Devices

Alsulami¹,

Rajeh²

2021

Preprint

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“…Because the organic glass is partially soluble in silicone grease, a polyvinyl alcohol solution was used for coupling. Both the silicone grease and the polyvinyl alcohol solution have near 100% optical transmission over the emission spectra for the three organic scintillator materials [22,23]. To reflect the scintillation light, the EJ-276 and organic glass samples had all remaining sides wrapped in over ten layers of polytetrafluoroethylene tape [24].…”

Section: Materials Data Acquisition and Signal Processingmentioning

confidence: 99%

Comparative scintillation performance of EJ-309, EJ-276, and a novel organic glass

et al. 2020

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A : An organic glass scintillator developed by Sandia National Laboratories was characterized in terms of its light output and pulse shape discrimination (PSD) properties and compared to commercial liquid (EJ-309) and plastic (EJ-276) organic scintillators. The electron light output was determined through relative comparison of the 137 Cs Compton edge location. The proton light yield was measured using a double time-of-flight technique at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. Using a tunable broad-spectrum neutron source and an array of pulse-shape-discriminating observation scintillators, a continuous measurement of the proton light yield was performed for EJ-309 (200 keV−3.2 MeV), EJ-276 (170 keV−4.9 MeV), and the organic glass (50 keV−20 MeV). Finally, the PSD properties of the organic glass, EJ-309, and EJ-276 were evaluated using an AmBe source and compared via a figure-of-merit metric. The organic glass exhibited a higher electron light output than both EJ-309 and EJ-276. Its proton light yield and PSD performance were comparable to EJ-309 and superior to that of EJ-276. With these performance characteristics, the organic glass scintillator is well poised to replace current state-of-the-art PSD-capable scintillators in a range of fast neutron detection applications.

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“…Urbach energy gives depiction of amorphosness in the material arising from the heterogeneous disorders. It increases with increase of amorphous characteristics in the materials 30 . Urbach energy is given by the relation;

\alpha ={\alpha}_o\exp \left(E-{E}_u\right)

where α o is a constant.…”

Section: Resultsmentioning

confidence: 99%

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

Swamy,

Mohana,

Madhukar

2023

Polymers for Advanced Techs

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Graphene nanoribbon (GNR) is quasi‐one dimensional carbon based nanomaterial, distinct from graphene and less explored nanofiller in optical and optoelectronic applications. Herein flexible poly vinyl alcohol (PVA) nanocomposites of 0, 0.25, 0.5 and 0.75 wt % compositions of GNR were prepared by using solution intercalation technique and characterized by spectroscopic methods to assess their structural and optical characteristics. The characterization of PVA@GNR nanocomposites revealed Vander Waals binding of GNR to PVA chains and also considerable crystallographic changes in PVA matrix upon the incorporation of GNR. The optical investigations showed UV‐visible absorption in the wavelength range of 200–280 and 350–520 nm which enhanced on increase in GNR dopant concentration. The decrease in the optical band gap and Urbach energy was also observed for the nanocomposites with increase in dopant concentrations thereby suggesting the formation of localized states in the forbidden band region. The refractive index, absorption coefficient, extinction coefficient and optical conductivity of PVA nanocomposites showed excellent agreement with the band gap revelations and indicated UVC light blocking properties in the wavelength of 200–280 nm. Further, the GNR incorporated PVA nanocomposites exhibited improved thermal stability, wettability transitions (hydrophilic to near hydrophilic) and excellent luminescent down‐conversion properties with a high Stokes's shift (100 nm) compared to pristine PVA nanocomposites. The study concludes that the proposed PVA@GNR nanocomposites can ideally fit optical and photovoltaic device applications owing to their transparency coupled with UV blocking and luminescence down‐shifting attributes.

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Improvement Optical Properties of PVA/ TiO2 and PVA/ ZnO Nanocomposites

Cited by 24 publications

References 5 publications

Structural, Thermal, Optical Characterizations of PANI/PMMA Composite Doped by TiO2 as an Application in Optoelectronic Devices

Structural, Thermal, Optical Characterizations of PANI/PMMA Composite Doped by TiO2 as an Application in Optoelectronic Devices

Comparative scintillation performance of EJ-309, EJ-276, and a novel organic glass

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

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