Effect of Gamma Irradiation on Structural, Morphological and Optical Properties of p-quaterphenyl Thin Films
Journal Title: JOURNAL OF ADVANCES IN PHYSICS - Year 0, Vol 14, Issue 2
Abstract
Para-quaterphenyl thin films were deposited onto glass and quartz substrates by thermal evaporation method. p-quaterphenyl thin films wereexposed to gamma radiation of Cobat-60 radioactive source at room temperature with a dose of 50 kGy to study the effect of ?-irradiation onthe structure and the surface morphology as well as the optical properties of the prepared films. The crystalline structure and the surface morphology of the as-deposited and ?-irradiated films were examined using the X-ray diffraction and the field emission scanning electron microscope. The optical constants (n & k) of the as-deposited and ?-irradiated films were obtained using the transmittance and reflectance measurements, in the wavelength range starting from 250 up to 2500 nm. The analysis of the absorption coefficient data revealed an allowed direct transition with optical band gap of 2.2 eV for the as-deposited films, which decreased to 2.06 eV after exposing film to gamma irradiation. It was observed that the Urbach energy values change inversely with the values of the optical band gap. The dispersion of the refractive index was interpreted using the single oscillator model. The nonlinear absorption coefficient spectra for the as-deposited and ?-irradiated p-quaterphenyl thin films were obtained using the linear refractive index.
Authors and Affiliations
A. A. Attia, M. M. Saadeldin, K. Sawaby
Keywords
Related Articles
- EP ID EP653506
- DOI 10.24297/jap.v14i2.7549
- Views 77
- Downloads 0
Crystalline Accommodation Law Explains The Crystalline Structure of Materials
All crystalline materials crystallize in one of seven crystalline systems which have different shapes and sizes. Why crystalline materials take particular forms of crystals and what make the atoms arrange themselves in t...
Deterministic Irreversibility and The Matter Structure
The role of existence of the deterministic irreversibility mechanism in development of evolution physics is studied. The short explanation of physical essence of this mechanism is offered. Based on this mechanism,...
The Weight Reduction of Charged Capacitors, Charge-Mass Interaction, and Einstein's Unification
The Biefeld-Brown (B-B) effect consists of two parts: 1) the initial thrust is due to the electric potential that moves the electrons to the positive post; and 2) the subsequent lift is due to the separate concentration...
An Elemental Analysis of Different CD-R discs
In this study Proton Induced X-ray Emission (PIXE) and Rutherford Backscattering Spectrometry (RBS) as reliable and non-destructive techniques has been applied to compare thickness, major and trace elements of different...
Simple analytical algorithm for constructing the envelope of the projectile trajectories in midair
A classic problem of the motion of a projectile thrown at an angle to the horizon is studied. The air drag force is taken into account asthe quadratic resistance law.An analytic approach is used for the investigation. Si...