NDLI: Effect of γ-irradiation on the frequency-independent parameters of an equivalent circuit for two-dimensional island platinum films

Content Provider	Springer Nature Link
Author	El Gamal, S. Bishay, A. G. Diab, S. M.
Copyright Year	2009
Abstract	Four sets (A, B, C and D) of two-dimensional island platinum films [2D-I(Pt)Fs] were prepared by the thermal evaporation technique. The mass thicknesses for the films of such sets are 1, 5, 10 and 20 Å, respectively. The frequency-independent parameters of one of the equivalent circuit for island metal films in general are R $_{b}$, R $_{g}$ and C $_{g}$ where R $_{b}$ is the resistance of the islands themselves while R $_{g}$ is the resistance that accompanies the transfer of electrons across the gaps among islands and C $_{g}$ is the capacitance that results from the separated metallic islands. The least-square values of R $_{b}$, R $_{g}$ and C $_{g}$ for our films were deduced via a computerized analysis. The stabilized films were exposed to γ-rays at doses 100, 200, 300, 500 and 700 Gy using $^{137}$Cs (0.662 MeV) radiation source of dose rate 0.5 Gy/min. It was found that (1) For any particular mass thickness: (a) R $_{b}$ and R $_{g}$ decreases with the increase in the dose of γ-rays while C $_{g}$ increases (b) the absolute value of the fractional change in R $_{b}$, R $_{g}$ and C $_{g}$ increases with the increase in dose. (2) For any particular dose the increase in the fractional change in R $_{b}$, R $_{g}$ and C $_{g}$ becomes more pronounced when the mass thickness increases. Qualitative interpretation for our results was given on the ground that γ-rays changed the island’s shape from spherical to prolate spheroid one and this has been checked experimentally via imaging the films by Atomic Force Microscope before and after γ-irradiations.
Starting Page	20
Ending Page	26
Page Count	7
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	21
Issue Number	1
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2009-03-10
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Characterization and Evaluation of Materials Optical and Electronic Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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