Issues

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2020

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vol. 18 /

Issue 4

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Ahmed Namah Mohamed, M. F. Jaddoa, Akeel Shaker Tuhaiwer
«Utilizing of (nTiO\(_2\)) Nanoparticles in Thin Films Based on Polystyrene Blending with (DCM) Laser Dye»
1063–1075 (2020)

PACS numbers: 68.37.Hk, 78.20.Ci, 78.40.-q, 78.66.Vs, 78.67.-n, 81.20.Fw, 81.40.Tv

Titania nanoparticles (nTiO\(_2\)) are synthesized by sol–gel technique. Characterization of nTiO\(_2\) is accomplished with XRD instrument. SEM is used to analyse the structure of nTiO\(_2\) samples and to determine nanoparticle sizes. Various concentrations of nTiO\(_2\) (0.5, 1, 1.5, 2 and 2.5 ml) blended with DCM laser dye blended with polymer (polystyrene) are synthesized via casting technique. Investigations of the effect of these additions on both optical properties and electronic-transition energy gaps in cases of Tauc’s model and derivative absorption spectra are carried out. The results of the allowed direct electronic transition energy gap indicate decreasing from 2.3 to 2.23 eV as nTiO\(_2\) concentration increase, whereas the energy gap magnitudes found from the first absorbance derivative decrease from 2.348 to 2.313 eV as nTiO\(_2\) concentration increase.

Keywords: optical absorption, titania nanoparticles (nTiO\(_2\)), first absorbance derivative, energy gap, Urbach’s energy

https://doi.org/10.15407/nnn.18.04.1063

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