Thermoluminescence and photoluminescence analyses of MEH-PPV, MDMO-PPV and RU(bpy) 3 gamma-irradiated polymer thin films

Ortiz-Morales, A.; Ortíz-López, J.; Cruz-Zaragoza, E.; Gómez-Aguilar, R.

doi:10.1016/j.apradiso.2015.04.013

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…α‐Relaxation is related to the rotational vibration of main chain segments and rotation of benzene rings in PS . Therefore the traps responsible for the glow curves were not localized but were continually distributed . Moreover, it can be noted that the PEC5 polymer film showed a linear response with dose (Figure ) and this was suggestive of the PEC5 polymer film being a good candidate for accidental dosimetry application …”

Section: Resultsmentioning

confidence: 96%

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Effect of γ‐irradiation on thermal and thermoluminescence properties of polystyrene/europium (III) oxide composite film

Bhavsar

Singh

2019

Luminescence

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In the present study, polystyrene:europium (III) oxide polymer films at a ratio of 95:5 wt% were prepared using a solution casting technique. These polymeric films were irradiated with 5, 25 and 50 kGy γ-radiation doses and their thermoluminescence (TL) and thermal properties were studied as a function of radiation dose. Analysis of Fourier transform infrared spectra revealed different modes of vibration and polymer-filler interaction. Reduction of vibrational modes with radiation dose was observed. The TL glow curve intensity was observed to increase with increasing radiation dose and to become broader in the 378 K and 444 K regions. Detrapping of electrons implied by the glow curve was caused by thermally induced macromolecular motion, concurrent with β-relaxation in polystyrene. The TL glow curve parameters were computed using a glow curve deconvolution method. Differential scanning calorimetry analysis indicated that the glass transition temperature (T g ) increased with increase in dose, suggesting crosslinking of the polymer chain. Scanning electron microscopy analysis evidenced the change in surface morphology due to γirradiation. K E Y W O R D S europium (III) oxide, γ-irradiation, polystyrene, thermoluminescence 1 | INTRODUCTION Polymers have received more attention and increased interest from scientists and researchers for potential application in the fields of science and technology. Compared with other host matrices, polymers have become a more favourable host matrix for optical and electronic applications. Devices made from polymers have become more flexible, are of high mechanical strength, and are light in weight. In this study, polystyrene (PS) was used as a host because of its excellent mechanical strength, good thermal resistance, and good chemical stability. As per requirement, alterations in the properties of polymer can be carried out by doping with metal oxides such as Al 2 O 3 , ZnO and TiO 2 .But rather than using metal oxides, rare earth ions are more useful because they show vibronic characteristics in the optical spectrum.Among all rare earth ions, Eu 3+ ions are widely used due to their electronic transition of excitation, emission, and absorption spectra, caused by the occurrence of vibronic characteristics. [1] However, rare

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Section: Resultsmentioning

confidence: 96%

“…It was observed that chain crosslinking could occur at high γ‐radiation doses . According to Ortiz‐Morales et al . polymer films could be used as radiation protection dosimetry at high doses of γ‐radiation.…”

Section: Introductionmentioning

confidence: 99%

Effect of γ‐irradiation on thermal and thermoluminescence properties of polystyrene/europium (III) oxide composite film

Bhavsar

Singh

2019

Luminescence

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“…These peaks are associated with the 0 − 0 and 0 − 1 vibronic transitions, respectively [52,53]. MDMO-PPV polymer emission occurs through electronic transitions between electronic states in different vibrational states [54]. The observed splitting corresponds to the energy of the out-of-plane C-H stretching vibration of the vinylene group (∼ 963 cm −1 ) [52].…”

Section: Photoluminescence Spectramentioning

confidence: 97%

Spectral Behavior of a Conjugated Polymer MDMO-PPV Doped with ZnO Nanoparticles: Thin Films

Abdelaziz,

Mustapha,

Bedja

et al. 2023

Nanomaterials

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The purpose of the presented study is to examine the impact of zinc oxide nanoparticles (ZnO NPs) on the spectrum features of poly [2-methoxy-5-(3′,7′-dimethyloctyloxy)-1, 4-phenylenevinylene] (MDMO-PPV). The characteristics of the MDMO-PPV and doped ZnO NPS samples were assessed using several techniques. A set of solutions of MDMO-PPV in toluene that were doped with different ratio percentages of ZnO NPs was prepared to obtain thin films. Pristine and composite solutions were spin-coated on glass substrates. It was observed that MDMO-PPV had two distinct absorbance bands at 310 and 500 nm in its absorption spectrum. The UV-Vis spectrum was dramatically changed when 5% of ZnO NPs were added. The result showed a significant reduction in absorption of the band 500 nm, while 310 nm absorption increased rapidly and became more pronounced. Upon adding (10%) ZnONPs to the sample, no noticeable change was observed in the 500 nm band. However, the 310 nm band shifted towards the blue region. There is a dominant peak in the PL spectrum of MDMO-PPV in its pristine form around 575 nm and a smaller hump around 600 nm of the spectrum. The spectral profile at 600 nm and the intensity of both bands are improved by raising the ZnO NP concentration. These bands feature two vibronic transitions identified as (0-0) and (0-1). When the dopant concentration increased to the maximum dopant percentage (10%), the energy band gap values increased by 0.21 eV compared to the pristine MDMO-PPV. In addition, the refractive index (n) decreased to its lowest value of 2.30 with the presence of concentrations of ZnO NPs.

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“…Breaking of chemical bonds and formation of free radicals upon absorption of light of wavelengths less than 380 nm have been reported to cause degradation or physical and chemical changes in PS . The modification of polymer composites by exposure to γ‐irradiation has important applications such as in radiation therapy and for medical implants with high strength, corrosion resistance and good tissue adherence . There have been reports of PS composites synthesized with BaF 2, ZnO, Al 2 O 3, CdS, (NA) 3 Eu(III), (NA) 3 Tb(III), (MOBA) 3 ‐Eu (III) and (FBA) 3 ‐Eu (III) fillers at different concentrations using various techniques and on their optical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of γ‐irradiation on optical properties of Eu₂O₃‐doped polystyrene polymer films

2018

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In the present study, europium (III) oxide (Eu O )-doped polystyrene (PS) polymer films were synthesized using a solution-casting technique for different filler levels. These films were irradiated with 5, 25 and 50 kGy γ doses and characterized using various techniques, viz. X-ray diffraction (XRD), and UV-visible and photoluminescence (PL) spectroscopies as a function of composition level and radiation dose. The UV-visible spectra indicated a decrease in the optical direct band gap of composite films with increasing concentrations of dopant and radiation dose. The band gaps of composites obtained using Tauc's equation were found to be 4.38, 4.37, 4.36 and 4.34 eV for 0, 1, 3 and 5% Eu O -doped PS respectively, while the band gaps of 5% Eu O -doped PS polymer films irradiated with 5, 25 and 50 kGy were found to be 4.30, 4.26 and 4.21 eV, respectively. Photoluminescence (PL) emission spectra showed the characteristic peaks of Eu at 595 nm, 612 nm and 617 nm with an excitation wavelength of 247 nm. The intensity of characteristic peaks of Eu was observed to increase with increasing filler concentration, while it was found to decrease with increasing radiation dose. The polymer under study may be useful in accidental dosimetry. As photoluminescence studies are carried out after a gap of 200 h from irradiation and PL emission of γ-irradiated polymer yielded 10 times emission when compared with non-irradiated polymer.

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Thermoluminescence and photoluminescence analyses of MEH-PPV, MDMO-PPV and RU(bpy) 3 gamma-irradiated polymer thin films

Cited by 6 publications

References 22 publications

Effect of γ‐irradiation on thermal and thermoluminescence properties of polystyrene/europium (III) oxide composite film

Effect of γ‐irradiation on thermal and thermoluminescence properties of polystyrene/europium (III) oxide composite film

Spectral Behavior of a Conjugated Polymer MDMO-PPV Doped with ZnO Nanoparticles: Thin Films

Effect of γ‐irradiation on optical properties of Eu₂O₃‐doped polystyrene polymer films

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Thermoluminescence and photoluminescence analyses of MEH-PPV, MDMO-PPV and RU(bpy) 3 gamma-irradiated polymer thin films

Cited by 6 publications

References 22 publications

Effect of γ‐irradiation on thermal and thermoluminescence properties of polystyrene/europium (III) oxide composite film

Effect of γ‐irradiation on thermal and thermoluminescence properties of polystyrene/europium (III) oxide composite film

Spectral Behavior of a Conjugated Polymer MDMO-PPV Doped with ZnO Nanoparticles: Thin Films

Effect of γ‐irradiation on optical properties of Eu2O3‐doped polystyrene polymer films

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Effect of γ‐irradiation on optical properties of Eu₂O₃‐doped polystyrene polymer films