Controlling of Optical Band Gap of Allyl Diglycol Carbonate Polymer with Ultraviolet Laser Radiation

Farooq, W. A.; Baig, M. R.; Fatehmulla, Amanullah; AlSalhi, Mohamad S.; Al-Ghamdi, Saleh; Yakuphanoğlu, F.

doi:10.12693/aphyspola.123.106

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…The onset absorbance was determined by the linear extrapolation of the steep part of the UV absorption toward the base line. The relationship between absorption coefficient α and optical band gap E g of material is expressed by the following relation :

false(italicα h italicν false) = C {(h ν - E_{g})}^{n},

where C is an energy‐independent constant and n is a constant which determines type of optical transitions, E g is the band gap energy (eV) of the sample and λ (nm) is the wavelength of the onset of the spectrum. ν (Hz) is the frequency of the light which determines its color and h is Planck's constant (J.s).…”

Section: Methodsmentioning

confidence: 99%

Photocatalytic Degradation of Glyphosate in Water by N‐Doped SnO₂/TiO₂ Thin‐Film‐Coated Glass Fibers

Kongsong

Sikong

Niyomwas

et al. 2014

Photochem & Photobiology

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Photocatalytic degradation of glyphosate contaminated in water was investigated. The N-doped SnO2/TiO2 films were prepared via sol-gel method, and coated on glass fibers by dipping method. The effects of nitrogen doping on coating morphology, physical properties and glyphosate degradation rates were experimentally determined. Main variable was the concentration of nitrogen doping in range 0-40 mol%. Nitrogen doping results in shifting the absorption wavelengths and narrowing the band gap energy those lead to enhancement of photocatalytic performance. The near optimal 20N/SnO2/TiO2 composite thin film exhibited about two- and four-folds of glyphosate degradation rates compared to the undoped SnO2/TiO2 and TiO2 films when photocatalytic treatment were performed under UV and solar irradiations, respectively, due to its narrowest band gap energy (optical absorption wavelength shifting to visible light region) and smallest crystallite size influenced by N-doping.

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false(italicα h italicν false) = C {(h ν - E_{g})}^{n},

Section: Methodsmentioning

confidence: 99%

Photocatalytic Degradation of Glyphosate in Water by N‐Doped SnO₂/TiO₂ Thin‐Film‐Coated Glass Fibers

Kongsong

Sikong

Niyomwas

et al. 2014

Photochem & Photobiology

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“…This method softens the material which increases etch rate. 4 The passing of alpha particles within CR-39 sample produces ionisation for almost all atoms closed to its path. This initial ionising process triggers a set of new chemical processes that result in the formulation of free chemical radicals and other chemical species.…”

Section: Introductionmentioning

confidence: 99%

Correlation between the Track Density and Absorbance of Alpha Particles using CR-39 Detectors from UV-Visible Spectrum

Ridha¹,

Kadhim²,

Mohammed³

2019

JPS

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A significant correlation between the track density measured by CR-39 and the affluence has been found in the current study. This correlation can be used to calculate the expected track density in solid state nuclear track detector irradiated by any alpha source of known activity without using the detectors. Nine pieces of CR-39 were irradiated with alpha particles from Am-241 (10 µCi) point source for 0 s, 10 s, 20 s, 30 s, 40 s, 50 s, 60 s, 70 s and 80 s. The absorbance in UV-visible region (before and after etching of the detector) and in the energy band gap showed an acceptable correlation at 650 nm wavelength. This result leads to two semi-empirical equations: first equation between the track density and the absorbance; and second equation between the absorbance and the affluence. These findings can give the track density or the affluence by calculating the absorbance of the detector after etching without microscopic viewing and calibration.

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“…Laser-induced surface modification of polymers is an attractive topic mainly due to their unique characteristics under nanosecond/femtosecond laser treatments [1][2][3][4][5][6][7][8][9][10][11][12]. Among the optical grade polymers, CR-39 possesses excellent mechanical and chemical properties with respect to the other polymers, such as poly methyl methacrylate (PMMA) and polycarbonate (PC).…”

Section: Introductionmentioning

confidence: 99%

Fabrication of self-ruled micro grating on CR-39 using ArF laser-induced rippling

et al. 2017

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The excimer laser at 193 nm induces regular self-assembled microstructures on poly allyl diglycol carbonate PADC (or CR-39). This surface rippling is threshold-dependent and undergoes different features at low/high UV fluences. The microstructures are characterized by small/large aspect ratios (0.056-0.226) at low/high UV fluences of 40-1000 mJ cm −2 . The self-aligning micro grooves show a strong sensitivity to the incident angles. As a consequence, the parameter of the fluence threshold drastically reduces in terms of the large incident angles, leading to parallelism over a broad treated area. In fact, the self-rippling at high UV fluences aligns with P-polarization of the incident beam. Conversely, the pattern appears in the orientation of the S-polarization under low fluences. This unique property of CR-39 is used to fabricate the micro gratings of 250-2900 lines mm −1 , which certainly meets the criteria for high efficiency at small aspect ratios.

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Controlling of Optical Band Gap of Allyl Diglycol Carbonate Polymer with Ultraviolet Laser Radiation

Cited by 9 publications

References 6 publications

Photocatalytic Degradation of Glyphosate in Water by N‐Doped SnO₂/TiO₂ Thin‐Film‐Coated Glass Fibers

Photocatalytic Degradation of Glyphosate in Water by N‐Doped SnO₂/TiO₂ Thin‐Film‐Coated Glass Fibers

Correlation between the Track Density and Absorbance of Alpha Particles using CR-39 Detectors from UV-Visible Spectrum

Fabrication of self-ruled micro grating on CR-39 using ArF laser-induced rippling

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Controlling of Optical Band Gap of Allyl Diglycol Carbonate Polymer with Ultraviolet Laser Radiation

Cited by 9 publications

References 6 publications

Photocatalytic Degradation of Glyphosate in Water by N‐Doped SnO2/TiO2 Thin‐Film‐Coated Glass Fibers

Photocatalytic Degradation of Glyphosate in Water by N‐Doped SnO2/TiO2 Thin‐Film‐Coated Glass Fibers

Correlation between the Track Density and Absorbance of Alpha Particles using CR-39 Detectors from UV-Visible Spectrum

Fabrication of self-ruled micro grating on CR-39 using ArF laser-induced rippling

Contact Info

Product

Resources

About

Photocatalytic Degradation of Glyphosate in Water by N‐Doped SnO₂/TiO₂ Thin‐Film‐Coated Glass Fibers

Photocatalytic Degradation of Glyphosate in Water by N‐Doped SnO₂/TiO₂ Thin‐Film‐Coated Glass Fibers