Structural and optical properties of pure PMMA and metal chloride-doped PMMA films

Zidan, H. M.; Abu-Elnader, M.

doi:10.1016/j.physb.2004.11.023

Cited by 187 publications

(101 citation statements)

References 24 publications

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“…The optical band gap of the PMMA films is obviously affected by defects and by the crystallinity. Such a decrease in the energy gap due to doping was also obtained by other researchers [11][12][13][14][15]. Wemple and Didomenico [16,17] used a single-oscillator description to define dispersion energy parameters.…”

Section: Resultssupporting

confidence: 70%

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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Section: Resultssupporting

confidence: 70%

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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“…This overlap may give us an evidence for decreasing energy gap when adding CaCO 3 in the polymer matrix [25].…”

Section: Resultsmentioning

confidence: 93%

Thermal and optical properties of poly(methyl methacrylate)/calcium carbonate nanocomposite

Elimat

Zihlif

Avella

2008

Journal of Experimental Nanoscience

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The study deals with thermal and optical properties of poly(methyl methacrylate) (PMMA) containing 2wt% calcium carbonate (CaCO 3 ) nanofiller. It was found that the thermal conductivity increases with increasing temperatures, due to thermal activation of the phonons in the PMMA/CaCO 3 nanocomposite. This enhancement in the thermal conduction is mainly attributed to the heat transferred by lattice vibrations as major contributors and electrons as minor contributors during thermal conduction. The optical properties were investigated as a function of wavelength and photon energy of UV radiation. The optical results obtained were analysed in terms of absorption formula for noncrystalline materials. It was found that the measured optical energy gap for the pure PMMA is greater than the PMMA/CaCO 3 nanocomposite. The width of the energy tails of the localised states was calculated. Adding CaCO 3 nanofiller into PMMA matrix may cause the localised states of different colour centres to overlap and extend in the mobility gap. This overlap may give an evidence for decreasing energy gap when adding CaCO 3 nanofiller in the polymer matrix.

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“…[32] for PA, PS, PE and PMMA. The energy band gap values are from Refs [33] (PA), [34] (PS), [35] (PE) and [36,37] as a model the expansion in Drude-Lindhard type oscillators [30] Im…”

Section: Surface Excitation Parameter From Queelsmentioning

confidence: 99%

“…[31] These parameters for PE, PS, PA and PMMA are essentially taken from Ref. [32] , while energy band gap values, E G , are from Refs [33] (PA), [34] (PS), [35] (PE) and [36,37] (PMMA). All parameters are listed in Table 1 and the ELF for PE, PS, PA and PMMA are displayed in Fig.…”

Section: Surface Excitation Parameter From Queelsmentioning

confidence: 99%

Surface excitation parameter for selected polymers

Pauly¹,

Tougaard²

2008

Surface & Interface Analysis

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The surface excitation parameter (SEP) is theoretically determined for different polymers, namely, polyethylene (PE), polystyrene (PS), polyacetylene (PA) and polymethyl methacrylate (PMMA), for electron energies between 300 and 5000 eV and for angles between 0 and 70 o to the surface normal. We use our previous definition of SEP as the change in excitation probability of an electron caused by the presence of the surface in comparison with an electron moving in an infinite medium. The calculations are performed within the dielectric response theory by means of the QUEELS-ε(k, ω)-REELS software determining the energy-differential inelastic electron scattering cross-sections for reflection-electron-energy-loss spectroscopy (REELS). More precisely, the volume component for an infinite medium is subtracted from the calculated REELS cross-section and in this way the surface excitation component of the cross-section is determined and the SEP calculated. We find that the presence of an energy band gap reduces the SEP values compared to those for metals, and this decrease is larger for polymers with larger gaps.

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Structural and optical properties of pure PMMA and metal chloride-doped PMMA films

Cited by 187 publications

References 24 publications

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

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

Thermal and optical properties of poly(methyl methacrylate)/calcium carbonate nanocomposite

Surface excitation parameter for selected polymers

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