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
The relation between the average diameter of CNTs on Ni–Cu @ a-C:H catalyst with the optical absorption edge and the optical dispersion parameters
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
the average diameter of CNTs, the optical absorption coefficients, the optical band gaps, the optical dispersion parameters
سال
2020
مجله JOURNAL OF MICROSCOPY
پژوهشگران ولی دلوجی

چکیده

In this study, the average diameter of the grown CNTs on Ni– Cu NPs @ a-C:H substrates were increased by increasing of Cu content. The obtained results indicated that by increase of Cu content, all films exhibited high-absorption spectra; therefore, we were facing an increase in the energy gap of films. The values of dT/dλ and dR/dλ measurements for grown CNTs with 75% Cu shown that maximum values of optical band gap correspond to with values of 2.48 eV and 2.90 eV, respectively. It can be seen that with increase of average diameter of the grown CNTs, the values of Urbach energy of films were increased. The RBS and EDAX measurements were confirmed presence of Ni and Cu atoms into films. The films deposited with 75% Cu were more smooth. Films deposited with 75% Cu have more disordered. Films deposited with 75% Cu atoms have maximum values of the oscillator strength f and the dispersion energy Ed about of 0.108 eV2 and 0.0543 eV, respectively.