03 خرداد 1403
ولي دلوجي

ولی دلوجی

مرتبه علمی: دانشیار
نشانی:
تحصیلات: دکترای تخصصی / فیزیک حالت جامد
تلفن: 0813339841
دانشکده: دانشکده علوم پایه

مشخصات پژوهش

عنوان
Porosity Evaluation and the Power Spectral Densities Analyses of Carbon–Nickel Composite Films Annealed at Different Temperatures
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
carbon films, porosity, annealing temperatures
سال
2016
مجله CHINESE PHYSICS LETTERS
پژوهشگران ولی دلوجی

چکیده

The densification and the fractal dimensions of carbon–nickel films annealed at different temperatures 300, 500, 800, and 1000∘C with emphasis on porosity evaluation are investigated. For this purpose, the refractive index of films is determined from transmittance spectra. Three different regimes are identified, 𝑇 < 500∘C, 500∘C< 𝑇 < 800∘C and 𝑇 > 800∘C. The Rutherford backscattering spectra show that with increasing the annealing temperature, the concentration of nickel atoms into films decreases. It is shown that the effect of annealing temperatures for increasing films densification at 𝑇 < 500∘C and 𝑇 > 800∘C is greater than the effect of nickel concentrations. It is observed that the effect of decreasing nickel atoms into films at 500∘C< 𝑇 < 800∘C strongly causes improving porosity and decreasing densification. The fractal dimensions of carbon–nickel films annealed from 300 to 500∘𝐶 are increased, while from 500 to 1000∘C these characteristics are decreased. It can be seen that at 800∘C, films have maximum values of porosity and roughness.