Fabrication and Characterization of Nickel Chloride Doped PMMA Films

Al-Taa’y, Wasan A.; Oboudi, Saad Farhan; Yousif, Emad; Nabi, Mohammed Abdul; Yusop, Muhammad Rahimi; Derawi, Darfizzi

doi:10.1155/2015/913260

Cited by 22 publications

(22 citation statements)

References 13 publications

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“…Similar to the studies in the literature, the indirect transition energies ( E i ) were obtained lower than the direct transition energies ( E d ) . In literature, the studies on various PMMA composites have reported that the optical band gap energy is in the range of 3.0–5.5 eV for pure PMMA , and the band gap energy level of insulating materials is around 6 eV. As pure PMMA is an insulating polymer, the value of 6 eV obtained is an acceptable result.…”

Section: Resultssupporting

confidence: 80%

“…This behavior was attributed to the increase of the local levels in the band gap, hence the distant between the conduction and valance band was decreased . This is an expected result, because the conductive additives added to the insulating PMMA matrix increase the conductivity of the composites and composites become semi‐conductive state . Additionally, E d values have two distinct linear regions in Fig.…”

Section: Resultsmentioning

confidence: 69%

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Effects of GNP addition on optical properties and band gap energies of PMMA films

et al. 2018

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In this study, the effects of graphene nanoplatelet (GNP) doping on the optical parameters (absorption coefficient, α and extinction coefficient, k) and the optical transition energies (optical band gap and Urbach energies) of poly(methyl methacrylate)/graphene nanoplatelet (PMMA/GNP) composite films were studied. PMMA/GNP composite films with various GNP mass fractions were prepared by spin coating technique. The absorbance (A) changes of the prepared composites were measured by using UV–Vis technique. The α and k values of the composites were obtained from UV–Vis data. The observed rapid increase in A values in UV‐region were associated with the optical transitions of GNP electrons from valence to conduction band. The direct (Ed) and indirect (Ei) optical band gap energies of the composites were determined by using Tauc method. Both of the band gap energies were decreased when the GNP content in the PMMA matrix is increased. The decrease in the band gap energies was interpreted as evidence of increased conductivity of the composites. Additionally, energies of the band tails (Urbach energy) were calculated. It was seen that the Urbach energy levels were increased with GNP content. POLYM. COMPOS., 40:1862–1869, 2019. © 2018 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 69%

Effects of GNP addition on optical properties and band gap energies of PMMA films

et al. 2018

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“…However, by increasing the content of PEG in the PVA/PEG blend, the skin depth showed an obvious decrease in its values due to an increase in the absorption possibility. Consequently, we can conclude that skin depth was transmittance related [16].…”

Section: Skin Depthmentioning

confidence: 78%

“…Skin depth δ is also known as the penetration depth and it describes the distance that an electromagnetic wave can penetrate into a polymeric material. The skin depth was estimated as a function of wavelength by using the following relation [16]:…”

Section: Skin Depthmentioning

confidence: 99%

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

2020

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In the present research work a solution casting technique was utilized to fabricate various blends of polyvinyl alcohol (PVA)/polyethylene glycol (PEG). Embedding PEG in PVA resulted in obvious shifts in the absorption edge which points to a decrease in the energy gap values based on PEG content. Loss of the photon energy was a consequence of increasing the extinction coefficient at high wavelengths. The PEG content increased the refractive index of the PVA in the produced PVA/PEG blends. The direct and indirect energy gap values were decreased whereas the Urbach energy values were increased with increasing the PEG content. The exact electron transition which is responsible for the absorption process was determined successfully based on the complex optical dielectric functions. In addition, some other optical parameters were estimated to more understand fully the effect of embedding the PEG in the PVA. The Fourier transform infra red spectroscopy was used to determine the characteristic functional groups of both the PVA and the PEG.

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“…After doped the average oscillator position values decreased and with increasing doping concentration to 5wt%, the average oscillator strength increased with impurity percentage as shown in Table 1. The skin depth x could be calculated using the following relation [18]: x = λ / 2πk (5) Where k is the extinction coefficient. Figure 6 shows the variation of skin depth as a function of wavelength for all films.…”

Section: Resultsmentioning

confidence: 99%

Effect of Nano Sb2O3 on the Dispersive Optical Constants of PMMA Films

Al-Taa’y

Nabi

Oboudi

et al. 2017

SQU Journal for Science

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Pure and Antimony Trioxide Sb2O3 doped PMMA films were prepared by the casting method. Optical absorption measurements in the wavelength range 200-800 nm were studied by using a computerized UVVis spectrophotometer (Shimadzu UV-1601 PC) and these confirmed that PMMA films have a direct band gap that decreases from 5.15 to 4.66 eV as the doping concentration increases to 5wt%. The increase in the density of localized states from 8.9 to 74.5 meV causes an expansion in the Urbach tail and consequently decreases the energy gap. The dispersion of the refractive index was analyzed using the concept of a single oscillator. The values of the single oscillator energy were 32.70, 13.59, 7.06, and 4.58 eV, while the dispersion energy values were 4.36, 49.04, 21.76 and 14.15 eV for the pure, and 3%, 4% and 5% Sb2O3 for the doped PMMA films respectively. The single-term Sellmeier were determined, and the average oscillator position was investigated, the value of which decreased with increasing doping concentration. The value of average oscillator strength increased with increasing Sb2O3 concentration to 5wt%. Skin depth and optical conductivity could be calculated, and results show a decrease in Skin depth with an increasing impurity percentage, but an increase of optical conductivity with greater impurity

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Fabrication and Characterization of Nickel Chloride Doped PMMA Films

Cited by 22 publications

References 13 publications

Effects of GNP addition on optical properties and band gap energies of PMMA films

Effects of GNP addition on optical properties and band gap energies of PMMA films

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

Effect of Nano Sb2O3 on the Dispersive Optical Constants of PMMA Films

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