27 مهر 1398
ولي دلوجي

ولی دلوجی

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

مشخصات پژوهش

عنوان
Carbon films embedded by nickel nanoparticles: The effect of deposition time on Berthelot-type hopping conduction parameters
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
deposition time, Berthelot type conduction, carbon films
سال
2016
مجله European Physical Journal Plus
پژوهشگران ولی دلوجی

چکیده

In this paper, the electrical conductivity of carbon films embedded by nickel nanoparticles at different deposition times 50, 90, 180 and 600 s over a temperature range from 50 to 500K was studied. The conductivity data in the temperature range T > 300K shows the extended state conduction mechanism. The tunneling through a thermally vibrating barrier in the temperature range 50–150K is described by the Berthelot-type conduction mechanism. It can be seen that the films deposited at 180 s have maximum conductivity and the Berthelot temperature is about 53.5K. Due to the vibrations of Ni ions in the tetrahedral, sites the extents of the carrier wave function are lower than in the octahedral complexes sites which have maximum values of about 2.16×10−7 cm and 1.85×10−7 cm in the octahedral-metal stretching vibrations and intrinsic stretching vibrations of the metal ions at the tetrahedral site, respectively. On the other hand, the average distance between the sites in both vibrations at 180 s deposition modes have minimum values of 2.02 × 10−7 cm and 1.72 × 10−7 cm.