Improve the surface structural and optical properties of PM-355 polymer by alpha particles

Zaki, M. F.; Al-Nagaar, Tayseer I.; El-Badry, Basma A.

doi:10.1007/s00289-021-04042-9

Cited by 19 publications

(11 citation statements)

References 47 publications

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“…The hypsochromic shift in PL emission spectra due to the increased surface roughness is well documented. 41–43 In contrast, the composite film MAPI:PBR-3 exhibits an increased emission, indicative of high recombination center formation and a reduction in band gap values compared to the pristine MAPI film. The substantial PL quenching observed in the MAPI:PBR-2 film suggests enhanced charge collection at the interface, signifying the formation of an efficient nanocomposite film.…”

Section: Resultsmentioning

confidence: 99%

High-performance CH₃NH₃PbI₃:PbS nanorod-based photodetectors fabricated using a slot die technique

Tarkas,

Rokade,

Upasani

et al. 2024

New J. Chem.

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Section: Resultsmentioning

confidence: 99%

High-performance CH₃NH₃PbI₃:PbS nanorod-based photodetectors fabricated using a slot die technique

Tarkas,

Rokade,

Upasani

et al. 2024

New J. Chem.

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“…In previous works, the authors recognized that an increase in the refractive index always results in a decrease in the optical band gap [20,34,46]. Table 2 shows an obvious decrease in the band gap corresponding to an increase in the refractive index.…”

Section: The Extinction Coefficient Refractive Index and Optical Densitymentioning

confidence: 85%

“…This broadening increased with increasing irradiation doses along with a noticeable shift in absorption edge toward the visible region for the γirradiated PVA/TiO 2 nanocomposite samples. This can be due to an increase in the extended systems of conjugated bonds (-C═C-) in the polymer after gamma irradiation, enhancing the carbon clusters and defects, both of which are the main reason behind this observed optical absorption behavior [34].…”

Section: Surface Roughness and Sem Analysismentioning

confidence: 98%

“…Furthermore, and with increasing irradiation doses, additional emission photons at energies 3.72, 3.67, 3.62, 3.10, 3.06, 2.90, 2.82 and 2.71 eV were observed related to the value of gamma-doses, particularly at the highest gamma-irradiation dose, as shown in figure 12. This could be attributed to the production of new luminescence levels due to the correlated transitions that originate from the increased defect formation with increasing gamma doses [34]. Furthermore, the emergence of these emission peaks in irradiated nanocomposite films can be brought upon by the occurrence of scission and, in some sites, cross-linking in the polymer chain.…”

Section: Photoluminescence Emission Analysismentioning

confidence: 99%

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Gamma rays induced modifications in the structural, optical and photoemission properties of PVA/TiO₂ nanocomposite films

El-Badry¹,

Khouqeer²,

Zaki³

2023

Phys. Scr.

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In the present study, nanocomposite films made of TiO2 (0.01 wt.%) nanoparticles (NPs) embedded in polyvinyl alcohol (PVA) polymers were prepared via the solution casting technique. The PVA/TiO2 nanocomposite films were irradiated with several doses of gamma-ray, ranging from 10-90 kGy. The unirradiated/irradiated nanocomposite films were investigated using FTIR spectroscopy, scanning electron microscope (SEM), roughness testing, UV–Vis spectroscopy, refractometry, densitometry, and photoluminescence spectroscopy. The results were then compared to the pure PVA polymer. FTIR spectra showed a decrease in intensity and a broadening of absorption bands due to interactions between the host PVA polymer atoms/molecules and the TiO2 NPs. SEM showed homogeneous dispersion of the TiO2 NPs in the PVA matrix. Gamma irradiation resulted in more significant morphological alterations and changing the roughness characteristics, the magnitude of which depended on the dose. UV-Vis spectra showed the absorption edge significantly changing with increasing gamma doses. The optical energy gap band, Urbach's energy, and the number of carbon clusters of the PVA/TiO2 nanocomposite films before and after gamma radiation were changed in comparison to the pure PVA sample. The refractive index and optical density improved due to the addition of TiO2 and γ-irradiation. The photoluminescence emission results emphasized the PVA/TiO2 film's high sensitivity to γ-rays, especially at high doses, resulting in strong fluorescence peaks due to increased defects in the irradiated films. All in all, the results prove that there are alterations in the PVA polymer after the addition of TiO2 and γ-irradiation, making these films good candidates for a variety of industrial applications, including γ-ray dosimeters.

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“…The two mechanisms are reliant on the polymer's nature and the environmental conditions, and consequently, scissioning and crosslinking are competing phenomena. Moreover, the natural behaviors of these changes in the irradiated polymeric lms depend on the interfering factors, like the composition of the polymer and its molecular weight, and also on the types of radiation and its energy [14][15][16]. Polymers are gaining popularity due to their numerous advantages, including ease of processing, and several degrees of elasticity or stiffness.…”

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confidence: 99%

Assessment the exposure effects of polycarbonate with X-ray radiation using spectroscopic techniques and molecular modeling calculations

Zaki,

Rashad,

Elkalashy

et al. 2023

Opt Quant Electron

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In this article, the effects of 6 MeV energy of X-ray radiation on polycarbonate polymeric lms were investigated. The induced alterations are assessed using several methodologies: FTIR spectroscopy, contact angle measurements, surface roughness assessment, UV/Vis spectroscopy, and luminescence emission spectroscopy. As well, using the basic sets in the ground state of the polycarbonate structure, the vibrational analysis has been carried out using the density functional theory (DFT). The FTIR spectra display that the X-ray irradiation produces surface chemical alterations in the irradiated lms due to successive degradation mechanisms due to the decrease in the detected band peaks. The basis sets that were calculated using the DFT method are in good agreement with the experimentally observed spectra.The frontier molecular orbital energies are used to assess the molecule's energy gap (HOMO-LUMO). The value of the frontier energy gap re ects the chemical reactivity and intermolecular charge transfer that take place within the molecule. The surface wettability behaviors were amended due to the decrease in the contact angle values of irradiated lms. This leads to an increase in the surface roughness and surface free energy. X-ray irradiation can enhance the surface goodness of polycarbonate lms and control their surface properties to be used in biocompatibility applications. The optical properties of irradiated lms show modi cations in the studied optical parameters. The absorbance spectra exhibited a shift in the absorption edge of the irradiated samples compared with the pristine one. This shift indicates the decreases in the band gap energy of irradiated samples. For direct transitions, the band gap decreased from 4.03 to 3.125 eV, and for indirect transitions, it decreased from 3.5 0 to 2.65 eV. This result was attributable to the formation of defects and the creation of complex charge transfer due to Xray irradiation. The photoluminescence emission spectra show that the peak intensities are obviously in uenced by increasing the irradiation doses. This is attributable to the band-band transition, donor/acceptor pairs, and bound to free transition, which correlated to the received absorbed dose.of oxidation products, polar components, creation of ionic chemical species, gaseous and water molecules production, loss of volatile fragments and the generation of free radicals that can cause scission and/or cross-linking mechanisms [11][12][13]. The two mechanisms are reliant on the polymer's nature and the environmental conditions, and consequently, scissioning and crosslinking are competing phenomena. Moreover, the natural behaviors of these changes in the irradiated polymeric lms depend on the interfering factors, like the composition of the polymer and its molecular weight, and also on the types of radiation and its energy [14][15][16]. Polymers are gaining popularity due to their numerous advantages, including ease of processing, and several degrees of elasticity or stiffness. They are also more affordable overall d...

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Improve the surface structural and optical properties of PM-355 polymer by alpha particles

Cited by 19 publications

References 47 publications

High-performance CH₃NH₃PbI₃:PbS nanorod-based photodetectors fabricated using a slot die technique

High-performance CH₃NH₃PbI₃:PbS nanorod-based photodetectors fabricated using a slot die technique

Gamma rays induced modifications in the structural, optical and photoemission properties of PVA/TiO₂ nanocomposite films

Assessment the exposure effects of polycarbonate with X-ray radiation using spectroscopic techniques and molecular modeling calculations

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Improve the surface structural and optical properties of PM-355 polymer by alpha particles

Cited by 19 publications

References 47 publications

High-performance CH3NH3PbI3:PbS nanorod-based photodetectors fabricated using a slot die technique

High-performance CH3NH3PbI3:PbS nanorod-based photodetectors fabricated using a slot die technique

Gamma rays induced modifications in the structural, optical and photoemission properties of PVA/TiO2 nanocomposite films

Assessment the exposure effects of polycarbonate with X-ray radiation using spectroscopic techniques and molecular modeling calculations

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High-performance CH₃NH₃PbI₃:PbS nanorod-based photodetectors fabricated using a slot die technique

High-performance CH₃NH₃PbI₃:PbS nanorod-based photodetectors fabricated using a slot die technique

Gamma rays induced modifications in the structural, optical and photoemission properties of PVA/TiO₂ nanocomposite films