کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7933401 1512850 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure, temperature and frequency dependent electrical conductivity of oxidized and reduced electrochemically exfoliated graphite
ترجمه فارسی عنوان
ساختار، درجه حرارت و فرکانس وابسته به هدایت الکتریکی از اکسید شده و کاهش گرافیت الکتروفروش خام
کلمات کلیدی
الکتروشیمیایی گرافیت پوشیده شده، طیف سنجی رامان، رسانایی الکتریکی، مکانیسم اکسیداسیون، مکانیسم کاهش،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
The article presents the influence of reduction by hydrogen in statu nascendi and modification by hydrogen peroxide on the structure and electrical conductivity of electrochemically exfoliated graphite. It was confirmed that the electrochemical exfoliation can be used to produce oxidized nanographite with an average number of 25 graphene layers. The modified electrochemical exfoliated graphite and reduced electrochemical exfoliated graphite were characterized by high thermal stability, what was associated with removing of labile oxygen-containing groups. The presence of oxygen-containing groups was confirmed using Fourier-transform infrared spectroscopy. Influence of chemical modification by hydrogen and hydrogen peroxide on the electrical conductivity was determined in wide frequency (0.1 Hz-10 kHz) and temperature range (−50 °C-100 °C). Material modified by hydrogen peroxide (0.29 mS/cm at 0 °C) had the lowest electrical conductivity. This can be associated with oxidation of unstable functional groups and was also confirmed by analysis of Raman spectra. The removal of oxygen-containing functional groups by hydrogen in statu nascendi resulted in a 1000-fold increase in the electrical conductivity compared to the electrochemical exfoliated graphite.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 99, May 2018, Pages 82-90
نویسندگان
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