Synthesis and Optical Characterization of Ag/PVA Nanocomposites Films

Salloom, Hussein T.; Jasim, Aseel S.; Hamad, Tagreed K.

doi:10.22401/jnus.20.4.10

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…Data unequivocally indicates that the inclusion of In 2 O 3 reduced the transmittance of light. Increasing the proportion of In 2 O 3 in the PMMA matrix improved the observed behavior, explaining the rise in light absorption and decline in transmittance caused by the enhancement with nanomaterials, which agrees with the previous studies [22].…”

Section: Resultssupporting

confidence: 92%

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Preparation and Investigation of Structural and Optical Properties of Poly(methyl methacrylate)/Indium Oxide Nanocomposites for Antibacterial Application

Mohammed,

Sami,

Salam

et al. 2024

Nano Biomedicine and Engineering

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This study describes the preparation of poly(methyl methacrylate) (PMMA) composites reinforced with various loadings (0 wt.%, 1.2 wt.%, 2.4 wt.%, and 3.6 wt.%) of indium oxide (In 2 O 3 ) using solution casting. Fourier-transformation infrared spectroscopy was used to analyze the structural characteristics of the nanocomposite and confirm the physical interactions between In 2 O 3 nanoparticles (NPs) and the PMMA matrix. Field emission scanning electron microscopy was used to examine the nanocomposite surface and showed that the In 2 O 3 NPs were distributed and homogenous through the PMMA matrix. An increase in the ratio of In 2 O 3 NPs in the PMMA changed the optical characteristics with an increase in the absorbance, absorption coefficient, refractive index, extinction coefficient, and real and imaginary dielectric constants and a decrease in the transmittance and indirect energy gap. The absorption coefficient was < 10 4 cm −1 , confirming the indirect electron transition. The antibacterial effect of PMMA/In 2 O 3 films were examined against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli and demonstrated an increase in inhibition zone diameter with an increase in In 2 O 3 NP content. Thus, the PMMA/In 2 O 3 nanocomposite exhibited antibacterial activity.

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Section: Resultssupporting

confidence: 92%

“…This information depends on the energy of the input light. The absorption coefficient was calculated using an empirical correlation [22]:…”

Section: Resultsmentioning

confidence: 99%

Preparation and Investigation of Structural and Optical Properties of Poly(methyl methacrylate)/Indium Oxide Nanocomposites for Antibacterial Application

Mohammed,

Sami,

Salam

et al. 2024

Nano Biomedicine and Engineering

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“…Lower energy transitions are possible because of the generation of charge transfer complexes (CTCs) in PVA as a result of which there is a decrease in the optical band gap. After films are UV irradiated ionic bonds break which causes reduction of Ag ions to metallic Ag inside PVA which increases the concentration of Ag NPs which results in the increment of (CTCs) between the HOMO and LUMO of PVA causing energy gap reduction [35]. Figure 2(b), (c), and (d) shows band gap reduces continuously as time for UV exposure increases [36].…”

mentioning

confidence: 95%

Ultraviolet (UV) irradiated induced changes in optical properties of PVA/Ag nanocomposite films

Nain¹,

Dahiya²,

Chahal³

et al. 2022

Phys. Scr.

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PVA/Ag nanocomposite with different concentrations of silver nanoparticles (Ag NPs) was successfully synthesized by the solution casting method. The effect of concentration of Ag NPs and ultraviolet (UV) irradiation on optical and structural properties of PVA/Ag nanocomposites were investigated by UV-Vis spectrophotometer and Fourier transform infrared spectroscopy. The presence of an absorption peak at around 410 nm recorded by UV-Vis spectrophotometer shows silver nanoparticles are formed. The absorption spectra for prepared nanocomposites recorded over the wavelength range of 200-700 nm shows the intensity of absorption band increases with an increase in the concentration of Ag NPs and with the increase in time of ultraviolet (UV) irradiation. Decreases in the broadness of transmission band with an increment in enfeeblement transmission intensity by UV exposure make its use suitable as a bandpass filter. Decrease in the value of the optical band gap from 4.91 eV for pure PVA to 4.32 eV for PVA doped 0.04M Ag was observed which continuously reduces further with an increase in the concentration of Ag NPs (3.67 eV for PVA doped 0.08M Ag). Additionally, as the time for UV exposure increases the value of the optical band gap decreases from 4.32 eV without UV exposure to 3.81 eV and 3.43 eV for UV exposure of 120 min and 240 minutes respectively for PVA doped 0.04M Ag. This reduction in values of the optical band gap corresponds to the formation of charge formation complexes inside the PVA matrix. Various optical parameters such as refractive index, single oscillator energy, lattice dielectric constant, the strength of interband optical transition, average oscillator strength, etc are calculated for nanocomposite with different concentrations of Ag NPs before and after UV exposure for different times. The refractive index values were observed to increase from 1.69 for pure PVA to 1.85 without UV exposure, which further increases to 2.30 for UV exposure of 240 minutes for PVA doped 0.08M Ag. FTIR spectra show the interaction between PVA and Ag NPs and show changes caused in the structure of nanocomposite as the time of UV exposure increases.

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“…From these figures, it is observed that the value of the extinction coefficient was improved with the contribution of PMMA and GO nanosheets. The equation below determines the refractive index (n) [45]:…”

Section: Resultsmentioning

confidence: 99%

Antibacterial Activity and Optical Behavior for Restoration of Micro and Nano Dental Fillers Using Functional Graphene Nanosheets with Polymethyl Methacrylate

Hassan,

Hamidinezhad,

Al-Bermany

2024

Nano Biomedicine and Engineering

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Polymer-based graphene nanocomposites significantly impact dental filler materials and antibacterial applications. Polymethyl methacrylate (PMMA) was used to improve the properties of nano and hybrid-dental fillings reinforced using synthesis graphene oxide (GO). Developed acoustic-solutionsonication-casting procedures were used to fabricate the new PMMA-dental filler-GO nanocomposites and the morphology, structure, optical properties, and antibacterial activity of samples were investigated. Fourier transforms infrared (FTIR) exposed good interaction among the PMMA, filling, and GO nanosheets. Scanning electron microscopy (SEM) and optical microscope (OPM) images revealed homogeneous samples and fine dispersion with improved morphology and overcoming cavities and cracks in the samples. The incorporation of PMMA and PMMA-GO in the nanocomposites showed promising properties: Absorption peak presented at 320 nm of samples enhanced from 0.8 (N1) to 0.98 (N3) for nano-fillers and from 0.7 (H1) to 0.97 (H3) for hybrid-fillers. Bandgap reduction from 3.35 (N1) to 3.15 (N3) for nano-fillers and from 3.10 (H1) to 2.75 (H3) for hybrid-fillers in allowed indirect transition, whereas it reduced from 3.38 (N1) to 3.00 (N3) for nanofillers and from 3.05 (H1) to 2.75 (H3) for hybrid-fillers in forbidden indirect transition after the contribution of PMMA and GO nanosheets. The inhibition zone of the Klebsiella bacteria significantly expanded from 17 to 23 mm for nano-fillers and from 16 to 22 mm for hybrid-fillers. Nanofillers nanocomposites presented better properties and inhabitances zone diameter of antibacterial compared with non-reinforced dental fillers.

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Synthesis and Optical Characterization of Ag/PVA Nanocomposites Films

Cited by 6 publications

References 10 publications

Preparation and Investigation of Structural and Optical Properties of Poly(methyl methacrylate)/Indium Oxide Nanocomposites for Antibacterial Application

Preparation and Investigation of Structural and Optical Properties of Poly(methyl methacrylate)/Indium Oxide Nanocomposites for Antibacterial Application

Ultraviolet (UV) irradiated induced changes in optical properties of PVA/Ag nanocomposite films

Antibacterial Activity and Optical Behavior for Restoration of Micro and Nano Dental Fillers Using Functional Graphene Nanosheets with Polymethyl Methacrylate

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