“…This characteristic can also be affected by synthesis procedure, surface defects, vacancies, and morphology 40 , 41 . Soni et al 42 confirmed that the addition of ZnO nanoparticles to the polymer films could enhance the optical properties of the prepared coatings. Figure 4 UV–Vis spectra of PMMA coating containing ( a ) 0.05 wt%, ( b ) 0.1 wt%, and ( c ) 0.2 wt% ZnO nanoparticles.…”
Section: Resultsmentioning
confidence: 93%
“…It was assessed by Senga et al 37 that increasing ZnO nanoparticle content could enhance the photoluminescent properties due to the addition of the availability of charge carriers. Moreover, the enhanced absorbance can be attributed to the jump of electrons from the valence band to the empty conduction band 37 , 42 .…”
This study aimed to assess the UV-shielding features of the PMMA-based thin film coatings with the addition of TiO2 and ZnO nanoparticles as nanofillers considering different contents. Furthermore, the effect of TiO2/ZnO nanohybrids at different ratios and concentrations was examined. The XRD, FTIR, SEM, and EDX analyses characterized the prepared films' functional groups, structure, and morphology. Meanwhile, the coatings' optical properties and UV-protecting capability were investigated by ultraviolet–visible (UV–Vis) spectroscopy. The UV–Vis spectroscopic study revealed that as the concentration of nanoparticles increased in the hybrid-coated PMMA, the absorption in the UVA region increased. Overall, it can be concluded that the optimal coatings for PMMA were 0.1 wt% TiO2, 0.1 wt% ZnO, and 0.025:0.025 wt% TiO2: ZnO nanohybrid. Considering the acquired FT-IR of PMMA with different content of nanoparticles before and after exposure to the UV irradiation, for some films, it was confirmed that the polymer-based thin films degraded after 720 h, with either decreasing or increasing intensity of the degraded polymer, peak shifting, and band broadening. Notably, the FTIR results were in good agreement with UV–Vis outcomes. In addition, XRD diffraction peaks demonstrated that the pure PMMA matrix and PMMA coating films did not show any characteristic peaks indicating the presence of nanoparticles. All diffraction patterns were similar with and without any nanoparticles. Therefore, it depicted the amorphous nature of polymer thin film.
“…This characteristic can also be affected by synthesis procedure, surface defects, vacancies, and morphology 40 , 41 . Soni et al 42 confirmed that the addition of ZnO nanoparticles to the polymer films could enhance the optical properties of the prepared coatings. Figure 4 UV–Vis spectra of PMMA coating containing ( a ) 0.05 wt%, ( b ) 0.1 wt%, and ( c ) 0.2 wt% ZnO nanoparticles.…”
Section: Resultsmentioning
confidence: 93%
“…It was assessed by Senga et al 37 that increasing ZnO nanoparticle content could enhance the photoluminescent properties due to the addition of the availability of charge carriers. Moreover, the enhanced absorbance can be attributed to the jump of electrons from the valence band to the empty conduction band 37 , 42 .…”
This study aimed to assess the UV-shielding features of the PMMA-based thin film coatings with the addition of TiO2 and ZnO nanoparticles as nanofillers considering different contents. Furthermore, the effect of TiO2/ZnO nanohybrids at different ratios and concentrations was examined. The XRD, FTIR, SEM, and EDX analyses characterized the prepared films' functional groups, structure, and morphology. Meanwhile, the coatings' optical properties and UV-protecting capability were investigated by ultraviolet–visible (UV–Vis) spectroscopy. The UV–Vis spectroscopic study revealed that as the concentration of nanoparticles increased in the hybrid-coated PMMA, the absorption in the UVA region increased. Overall, it can be concluded that the optimal coatings for PMMA were 0.1 wt% TiO2, 0.1 wt% ZnO, and 0.025:0.025 wt% TiO2: ZnO nanohybrid. Considering the acquired FT-IR of PMMA with different content of nanoparticles before and after exposure to the UV irradiation, for some films, it was confirmed that the polymer-based thin films degraded after 720 h, with either decreasing or increasing intensity of the degraded polymer, peak shifting, and band broadening. Notably, the FTIR results were in good agreement with UV–Vis outcomes. In addition, XRD diffraction peaks demonstrated that the pure PMMA matrix and PMMA coating films did not show any characteristic peaks indicating the presence of nanoparticles. All diffraction patterns were similar with and without any nanoparticles. Therefore, it depicted the amorphous nature of polymer thin film.
“…In (2020), G. Soni, et. al [112] ,studied the impact of a mixture of ZnO and SiO2 nanoparticles on the optical properties of a solution-cast composite thin film PMMA/ZnO/SiO2, with a thickness of 50 µm, and discovered that the optical bandgap of the composite thin films decreases with increasing concentrations of zinc oxide and silica. In (2021), L. Gaabour [113], studied the impact of adding titanium oxide nanoparticles (TiO2) to a polymer mix of polystyrene (PS) and polyvinyl chloride (PVC) with a composition of 50/50 wt.%.…”
Section: Nanocomposites and Some Applicationsmentioning
Polymers have many applications in various medical and industrial approaches. One of these polymers is polystyrene which has special properties to be considered as promising material in different optics, biomedical, and electronics fields. The addition of metal oxides nanoparticles to polystyrene have huge applications in different approaches. This article includes a recent review on metal oxide NPs doped polymer (such as polystyrene). The previous studies demonstrated the polystyrene nanocomposites comprised numerous applications in the electronics, sensors, optical optoelectronics, and biomedical fields.
“…This observed trend can be attributed to the local energy levels in the band gap structure which acts as electron traps in the band gap therefore, the gap between the valence and conduction band is reduced. 44 As the electrical conductivity of the composite material increases, the energy gap gets smaller. PVA/CS/MWCNT system containing different proportions of acetic acid was investigated by Abdolrahimi et al and they showed that the optical direct band gap energies of the biocomposites decreased from 5.58 eV to 4.47 eV.…”
Section: Optical Band Gap Energy Determinationmentioning
In recent years, as a result of increasing environmental concerns, biodegradable materials have gained great attention. With the rapid development of electronic technology, the importance of innovation and development of low-cost, sustainable, transient bioelectronics materials is increasing. In this research, the preparation of Poly(Vinyl Alcohol) (PVA), Chitosan (CS), and Multi-Walled Carbon nanotube (MWCNT) biocomposite films have been described. The solution mixing, ultrasonic mixing, and spin coating techniques were used to prepare the PVA/CS/MWCNT biocomposite thin films. UV–Vis absorption spectroscopy and two-point probe resistivity measurement techniques were used to study the optical and electrical properties of the biocomposite thin films. Optical band gap energies ( Eg) of PVA/CS/MWCNT biocomposites were obtained using the Tauc and Absorbance Spectrum Fitting (ASF) methods. Results obtained with both methods were found to be exactly the same. Experimental results have shown that with increasing MWCNT concentration, electrical conductivity (σ) increases from 1.75x10−16 S to 2.94x10−3 S, and Eg decreases significantly. At the same time, the fundamental optical parameters such as band tail (Urbach) energy ( Eu), refractive index ( n), absorption ( α), and extinction ( k) coefficient of the PVA/CS/MWCNT biocomposites were investigated in the UV-VIS range. The improvement observed in the optical and electrical properties of PVA/CS/MWCNT biocomposite films shows that these composites could be used as bioelectronics materials.
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