Structural, thermal and optical characteristics of laser-exposed Pd/PVA nanocomposite

Nouh, S. A.; Benthami, K.; Elfadl, A. Abou; El-Shamy, N. T.; Tommalieh, M.J.

doi:10.1007/s00289-020-03188-2

Cited by 23 publications

(10 citation statements)

References 36 publications

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“…In previous works, different kinds of materials as fillers in polymers have been explored for such applications [13][14][15][16]. These fillers involve organic dyes as erythrosine B and carmine [17,18].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the optical properties of PVP using Zn1-xSnxS for UV-region optical applications

Badawi

2021

Appl. Phys. A

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The optical properties of polyvinylpyrrolidine (PVP) polymer have been enhanced using ternary Zn 1-x Sn x S as a filler for UVregion optical applications. Solution casting technique is used to prepare different Sn molar ratios (x: 0-0.3) in Zn 1-x Sn x S filled PVP polymeric composite films (1.0 wt.%). SEM, FT-IR and UV-visible-NIR spectrophotometry is utilized to characterize the optical properties of the plain PVP and polymeric composite films. SEM images reveal the homogeneous dispersion of the filler (Zn 1-x Sn x S) in the host PVP matrix. The FT-IR spectroscopic measurements ensure the successful interaction of ternary Zn 1-x Sn x S material and the host PVP polymer. The cut off transmittance edge is shifted from 260 nm (host PVP) to 390 nm (polymeric composite). The direct optical energy bandgap of the prepared polymeric composite films are shifted from 4.78 eV (plain PVP) to 3.45 eV for Zn 0.7 Sn 0.3 S polymeric composite film. An enhancement of the refractive index (n) and the optical conductivity (σ opt.) of the polymeric composite films is achieved as compared with those of the plain one. The single oscillator (E 0) and dispersion (E d) energies of the polymeric composite films were determined using Wemple and DiDomenico (WDD) model. The prepared polymeric composite films are strongly recommended for UV-region optical applications.

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Section: Introductionmentioning

confidence: 99%

Enhancement of the optical properties of PVP using Zn1-xSnxS for UV-region optical applications

Badawi

2021

Appl. Phys. A

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“…The Pd NPs were synthesized and characterized following the same technique used in our previous study [26]. The Pd has a particle size in the range 2-22 nm with 10 nm on average [26].…”

Section: Methodsmentioning

confidence: 99%

Structural, Thermal, and Optical Studies of Gamma Irradiated Polyvinyl Alcohol-, Lignosulfonate-, and Palladium Nanocomposite Film

et al. 2022

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Nanocomposite (NC) films of polyvinyl alcohol (PVA), lignosulfonate (Lg), and nanosized palladium (Pd) were synthesized by ex-situ casting method. Samples from the synthesized PVA-Lg/Pd NC films were irradiated with 5–100 kGy γ doses. The effect of γ doses on the structural, thermal, and optical characteristics of the NC films were studied using different characterization techniques. The results indicated that the γ irradiation improves the decomposition temperature from 227 to 239 °C, signifying an increase in the thermal stability of the NC films. This was accompanied by a reduction of the melting temperature due to the increase of the amorphous phase. This can be attributed to the dominance of crosslinking. On the other hand, the refractive index increased from 2.21 to 2.32 while increasing the γ dose up to 100 kGy. This was associated with a reduction of the optical bandgap from 3.49 to 3.30 eV, which could be attributed to the increase in the amorphous phase as a result of crosslinking. This indicates an enhancement of the spreading of the NPs inside the blend matrix due to γ irradiation. This results in a more compacted construction of the PVA-Lg/Pd NC films. Furthermore, we used the Commission Internationale de E’Claire (CIE) method to estimate the change in color among the irradiated NC films and the pristine film. The PVA-Lg/Pd NC attained a significant color difference value greater than five, meaning permanent color changes.

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“…The decrease of the absorbance with the increase in the wavelength was attributed to reducing the number of (n− π*) carbonyl group and phenyl group (π− π*) transitions [25]. Furthermore, the absorbance of the samples was improved with raising the laser fluences up to 18 J/cm 2 due to the development of bonding via crosslinks [26].…”

Section: Absorption Analysismentioning

confidence: 97%

“…This creates structural deficiencies, allowing the formation of localized states in the Eg construction initiating lesser energy micro-electronic transitions. Otherwise, the significant act of the laser radiation on the samples was the creation of free radicals which caused the development of the conjugated bonds and hence decreasing the Eg [26].…”

Section: Analysis Of Bandgapmentioning

confidence: 99%

Effect of GaAs pulsed laser on the structure and optical characterization of Makrofol VLG 7-1

Bahareth

2022

Arab Journal of Nuclear Sciences and Applications

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Samples ofMakrofol films were exposed to different laser fluences (2-18 J/cm 2 ). X-ray diffraction (XRD) and ultraviolet spectroscopy (UVs) techniques were used to explore the resultant effect of laser radiation on the structure and optical characteristics of the Makrofol polymer. The change of refractive index (n) and the optical band gap (Eg) with the laser fluence was interpreted. A reduction in the Eg values (3.08-2.54 electron volt) was observed when raising the laser fluence up to 18 J/cm 2 . This was accompanied by an increase in refractive index from 2.376 to 2.533. This was attributed to the prevalence of crosslinking that damaged the crystalline portion in the Makrofol polymer. The crosslinking created color centers that induced differences in color between the exposed films and the uncolored pristine Makrofol film. The color difference was significant as the values of E were greater than 5. This optimized the Makrofol polymer to be used in dosimetric applications.

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Structural, thermal and optical characteristics of laser-exposed Pd/PVA nanocomposite

Cited by 23 publications

References 36 publications

Enhancement of the optical properties of PVP using Zn1-xSnxS for UV-region optical applications

Enhancement of the optical properties of PVP using Zn1-xSnxS for UV-region optical applications

Structural, Thermal, and Optical Studies of Gamma Irradiated Polyvinyl Alcohol-, Lignosulfonate-, and Palladium Nanocomposite Film

Effect of GaAs pulsed laser on the structure and optical characterization of Makrofol VLG 7-1

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