Electrical and Optical Properties of O<sup>6+</sup>Ion Beam–Irradiated Polymers

Prasher, Sangeeta; Kumar, Mukesh; Singh, Surinder

doi:10.1080/1023666x.2014.879418

Cited by 76 publications

(25 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is clear that the Urbach energy increases with increasing aluminum concentration. This is indirectly indicates an increase of amorphous phase in polymer composite samples [28]. The larger energy tails means the creation of disorder and imperfections in the band structure of the composites.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Tuning the absorption of ultraviolet spectra and optical parameters of aluminum doped PVA based solid polymer composites

Aziz

Ahmed

Hussein

et al. 2015

J Mater Sci: Mater Electron

163

View full text Add to dashboard Cite

In this research work PVA:xAl (0.01 B x B 0.05) based solid polymer composites have been prepared by solution cast technique. The transmittances of the samples are decreased with increasing Al powder concentration. The absorption spectra of the samples are shifted to higher wavelengths which indicate their importance for shielding. The increase of absorption intensity in UV region was observed. The clear shift of absorption edge upon the addition of Al powder content indicated the decrease of energy band gap. The increase of extinction coefficient at high wavelengths for the samples containing Al powder revealed the loss of photon energy. The refractive indexes of the doped samples are increased compared to that of pure PVA.The linear relationship between the refractive index and volume fraction indicates a good dispersion of Al powder in PVA host polymer. The direct optical band gap measured from the plot of (aht) 2 versus photon energy (ht) showed a decreasing trend with increase of Al content. The Urbach energy was found to increase with increasing aluminum concentration. The complex optical dielectric functions were used to determine the type of electron transition.

show abstract

Section: Resultsmentioning

confidence: 99%

“…It has been understood that band tail states in amorphous materials arise from strains in the network that are sufficient to push the states into the forbidden gap. Such tails decay exponentially into the band gap [28]. The width of Urbach tail is an indicator of the defect levels present in the forbidden band gap.…”

Section: Resultsmentioning

confidence: 99%

Tuning the absorption of ultraviolet spectra and optical parameters of aluminum doped PVA based solid polymer composites

Aziz

Ahmed

Hussein

et al. 2015

J Mater Sci: Mater Electron

163

View full text Add to dashboard Cite

show abstract

“…The increase in the E U values with increasing the content of PEG in PVA/PEG, as illustrated in Table II, can be an indication of increase of the amorphous phase in the blends. However, in case of PVA, the lesser value of E U in comparison with those of the blends means that the PVA had a wider energy band gap [21].…”

Section: Interband Transitionsmentioning

confidence: 92%

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

2020

View full text Add to dashboard Cite

In the present research work a solution casting technique was utilized to fabricate various blends of polyvinyl alcohol (PVA)/polyethylene glycol (PEG). Embedding PEG in PVA resulted in obvious shifts in the absorption edge which points to a decrease in the energy gap values based on PEG content. Loss of the photon energy was a consequence of increasing the extinction coefficient at high wavelengths. The PEG content increased the refractive index of the PVA in the produced PVA/PEG blends. The direct and indirect energy gap values were decreased whereas the Urbach energy values were increased with increasing the PEG content. The exact electron transition which is responsible for the absorption process was determined successfully based on the complex optical dielectric functions. In addition, some other optical parameters were estimated to more understand fully the effect of embedding the PEG in the PVA. The Fourier transform infra red spectroscopy was used to determine the characteristic functional groups of both the PVA and the PEG.

show abstract

“…Knowing the activating energy U and relaxation time s 0 , the Debye relaxation time s(T) can be determined at any other temperature using Equation (8).…”

Section: Theoretical Aspects Of Tsdcmentioning

confidence: 99%

“…[7] Swift heavy ion irradiation is well known for modification of physical, structural, electrical, optical, mechanical, and thermal properties in different polymeric materials (made up of long-chain molecules, like LC molecules). [8][9][10][11] Moreover, devices made up of liquid crystalline materials are often used in high-radiation environments such as nuclear installation centers and space applications. [12] When these devices are used for a long time in such environments, different types of irradiation may affect their functioning.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature TSDC Studies of Molecular Dynamics in Pristine and O⁷⁺Ion–Modified Liquid Crystalline Polyurethane

Lal

Quamara

2014

International Journal of Polymer Analysis and Characterization

View full text Add to dashboard Cite

The molecular dynamics of pristine and 100 MeV O 7þ ion-modified liquid crystalline polyurethane (LCPU) was carried out using the thermally stimulated depolarization currents (TSDC) method. The TSDC spectra of pristine LCPU samples consist of current peaks appearing around 110,160, 210, and 260 K and are called the c, b, a, and d peaks respectively. The c-peak is attributed to the crankshaft motion of the spacer group (but-2-ene group). The b-peak is due to the localized rotational fluctuations of C=O groups. The a-peak is associated with the dipolar orientation of imines group present in the urethane linkage, and the d-peak has its origin in the space charge trapping mechanism. In the TSDC spectra of O 7þ ion-irradiated LCPU samples the c-peak almost disappears, which shows that the ion induced modification in the methylene linkage. A relaxation process owing to new sub-polar groups formed due to dehydrogenation of CH 2 groups and occurring in the vicinity of b-relaxation is discussed. The radiation-induced chain scissioning at NH groups in LCPU is also confirmed from the fluence effect on the a-peak. The irradiation results in the production of a large number of defect sites and an increase in the same results in the enhancement of d-relaxation.

show abstract

Electrical and Optical Properties of O⁶⁺Ion Beam–Irradiated Polymers

Cited by 76 publications

References 16 publications

Tuning the absorption of ultraviolet spectra and optical parameters of aluminum doped PVA based solid polymer composites

Tuning the absorption of ultraviolet spectra and optical parameters of aluminum doped PVA based solid polymer composites

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

Low-Temperature TSDC Studies of Molecular Dynamics in Pristine and O⁷⁺Ion–Modified Liquid Crystalline Polyurethane

Contact Info

Product

Resources

About

Electrical and Optical Properties of O6+Ion Beam–Irradiated Polymers

Cited by 76 publications

References 16 publications

Tuning the absorption of ultraviolet spectra and optical parameters of aluminum doped PVA based solid polymer composites

Tuning the absorption of ultraviolet spectra and optical parameters of aluminum doped PVA based solid polymer composites

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

Low-Temperature TSDC Studies of Molecular Dynamics in Pristine and O7+Ion–Modified Liquid Crystalline Polyurethane

Contact Info

Product

Resources

About

Electrical and Optical Properties of O⁶⁺Ion Beam–Irradiated Polymers

Low-Temperature TSDC Studies of Molecular Dynamics in Pristine and O⁷⁺Ion–Modified Liquid Crystalline Polyurethane