Carbonaceous clusters in irradiated polymers as revealed by UV-Vis spectrometry

Fink, D.; Chung, W.; Klett, R.; Schmoldt, Angela; Cardoso, J.; Montiel, R.; Vázquez, Muñiz; Wang, L.; Hosoi, Fumio; Omichi, Hideki; Goppelt-Langer, P.

doi:10.1080/10420159508223990

Cited by 189 publications

(65 citation statements)

References 21 publications

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“…Upon irradiation, the colorless surface became light brown as the gamma dose gradually increased (22) . For a linear structure, the number of carbon atoms per conjugation length N is given by (6) :…”

Section: Resultsmentioning

confidence: 99%

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: 99%

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

Zaki¹

2008

J. Phys. D: Appl. Phys.

110

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“…The polymer irradiation leads to a shift in the optical absorption edge towards longer wavelengths, which indicates a lowering of the energy gap. This is related to the formation of clusters with rings or due to the formation of conjugated double bonds or quinonic structures [4]. This shift can be correlated with optical band gap E g by expression [8] :…”

Section: Uv-vis Analysismentioning

confidence: 99%

“…The induced effects are responsible for altering the properties of the material, which can be determined by different analytical techniques. The UV-visible absorption studies of ion-irradiated polymers provide information regarding the variation in optical band gap [4]. The chemical changes caused by ionizing radiations involve the main-chain scission, cross-linking, creation of free radicals and formation of saturated and unsaturated groups with stimulated evolution of gasses [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic studies of copper and carbon ion irradiated polypropylene

et al. 2009

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The samples of polypropylene (PP) have been irradiated with 120 MeV 64 Cu 9+ and 70 MeV 12 C 5+ ion beams, with the fluence ranging from 1 × 10 13 to 1 × 10 11 ions/-cm -2 . UV-VIS and FTIR techniques have been used to study the chemical and optical properties of these irradiated polymers. UV spectra revealed that the optical-gap energy decreases by 54 % with copper ion irradiation at the fluence of 1 × 10 13 ions/cm 2 , whereas at the same fluence, carbon beam decreases the optical-gap energy by 20%. FTIR analysis of ion irradiated samples revealed the presence of -OH, C = O and C = C bonds. Alkyne formation has been observed only in the case of copper ion irradiation.

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“…The relation between the band gap (E g ) and the cluster size (number of carbon atoms per cluster), N, can be determined according to the following formula [23]:…”

Section: Cluster Sizementioning

confidence: 99%

Study the effect of alpha particle fluences on the morphology and optical properties of poly-aniline in nano-scale

2013

IOSR-JAP

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Carbonaceous clusters in irradiated polymers as revealed by UV-Vis spectrometry

Cited by 189 publications

References 21 publications

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

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

Spectroscopic studies of copper and carbon ion irradiated polypropylene

Study the effect of alpha particle fluences on the morphology and optical properties of poly-aniline in nano-scale

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