Effect of gamma irradiation on the optical properties of CR-39 polymer

Sharma, Tanu; Aggarwal, Sanjeev; Kumar, S.; Vk, Mittal; Kalsi, P. C.; Manchanda, V. Κ.

doi:10.1007/s10853-006-0516-7

Cited by 112 publications

(37 citation statements)

References 27 publications

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“…5. The simultaneous existence of indirect as well as direct band gap in CR-39 polymer has rarely been reported (23) , although such a coexistence of direct and indirect band gap have been observed in some other materials (24,25,30−34) .…”

Section: Resultsmentioning

confidence: 93%

Gamma-induced modification on optical band gap of CR-39 SSNTD

Zaki¹

2008

J. Phys. D: Appl. Phys.

110

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Effect of gamma irradiation on optical absorption of nuclear track detectors like CR-39 was studied in different absorbed doses using ultraviolet-visible (UV-VIS) spectroscopy. The existence of the peaks, their shifting and broadening as a result of gamma irradiation has been discussed. The width of the tail of localized states in the band gap (E u ) was evaluated using the Urbach edge method. Finally the indirect and direct band gap in pristine and gamma irradiated CR-39 have been determined. The values of indirectly band gap have been found to be lower than the corresponding values of direct band gap. A decrease in the optical energy gap with increasing the gamma absorbed dose can be discussed on the basis of gamma-irradiation-induced defects in the CR-39. The correlation between optical band gap and the number of carbon atoms in a cluster with modified Tauc's equation has been discussed in case of CR-39.

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Section: Resultsmentioning

confidence: 93%

Gamma-induced modification on optical band gap of CR-39 SSNTD

Zaki¹

2008

J. Phys. D: Appl. Phys.

110

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“…* transitions. The relation between optical band gap E g , absorption coefficient # and the energy h$ of the incident photon is given by Equation (4) [20]: The phonon absorption in many amorphous materials is found to obey the Tauc's relation (2).The index n has discrete values such as 1/2, 3/2, 2 or more depending on whether the transition is direct or indirect and allowed or forbidden, respectively. In the present case the photon energy is plotted against #h$, for n = 2 it gives a straight line fit, which implies that the samples obey indirect transition.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization and properties of Se nanowires intercalated polyaniline/Se nanocomposites

Shumaila¹,

Alam²,

Siddiqui³

et al. 2013

Express Polym. Lett.

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Abstract. Present work reports novel synthesis of Polyaniline (PANI)/Se nanocomposites. Se nanowires are prepared from SeO 2 under assistance of vitamin C and polyaniline is synthesized through chemical oxidation. The effect of composition of Se nanowires on the properties of polyaniline was investigated and five orders increase in conductivity after doping has been observed. The electrical properties of nanocomposites show that conduction is through hopping process due to the wide range of localized states present near fermi level. FTIR (Fourier Transform Infrared spectroscopy) and ultraviolet (UV)-visible studies confirm the occurrence of polyaniline in conducting emeraldine salt form in the composites and suggest incorporation of Se in polymer. The optical studies indicate that absorption mechanism is due to indirect allowed transition and the optical band gap tends to decrease after doping. The thermal stability of composites has been ascertained on the basis of DSC (Differential Scanning Calorimetery) measurements. TEM (Transmission Electron Microscopy) and SEM (Scanning Electron Microscopy) analysis have also been carried out for morphological studies.

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“…In literature several such studies have been carried out recently on the effects of irradiation on polymers by different authors [13][14][15][16][17][18]. A comparison of the data on optical studies of the present detector with those reported on other detectors such as CR-39 have shown that the gamma irradiation of these detectors also leads to shift in optical absorption edges, which indicates a lowering of the energy band gap [13,17,18]. The decrease in energy band gap implies an increase in conductivity [18,19] of the irradiated polymers.…”

Section: Resultsmentioning

confidence: 99%

Thermal and optical studies on unirradiated and γ-irradiated polyester track detector

Kalsi

Ramaswami

2009

Indian J Phys

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Thermal and optical properties of unirradiated and C-irradiated polyester track detector films in the dose range of 0-14.5 Mrad have been studied by thermogravimetry (TG) and UV-Visible spectroscopic technique. The samples were irradiated with 60 Co C-rays for doses of 4.7, 8.1 and 14.5 Mrad. The TG studies indicate that unirradiated and the C-irradiated samples degrade in two steps. The kinetics of the two steps of degradation were also evaluated from the TG curves. Irradiation enhances the degradation rate and the effect increases further with increasing radiation dose. The optical band gaps of the unirradiated as well as the irradiated samples were also determined from the UV-Visible spectra. These studies can be used for the estimation of C-dose using changes in absorbance and the activation energy due to C -irradiation.

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Effect of gamma irradiation on the optical properties of CR-39 polymer

Cited by 112 publications

References 27 publications

Gamma-induced modification on optical band gap of CR-39 SSNTD

Gamma-induced modification on optical band gap of CR-39 SSNTD

Synthesis, characterization and properties of Se nanowires intercalated polyaniline/Se nanocomposites

Thermal and optical studies on unirradiated and γ-irradiated polyester track detector

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