کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7851373 1508852 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural analysis of polycrystalline graphene systems by Raman spectroscopy
ترجمه فارسی عنوان
تجزیه و تحلیل ساختاری سیستم های گرافنی پلی کریستالی توسط طیف سنجی رامان
کلمات کلیدی
رامان، گرافن، اندازه کریستالیت، پلی کریستال،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
چکیده انگلیسی
A theoretical model supported by experimental results explains the dependence of the Raman scattering signal on the evolution of structural parameters along the amorphization trajectory of polycrystalline graphene systems. Four parameters rule the scattering efficiencies, two structural and two related to the scattering dynamics. With the crystallite sizes previously defined from X-ray diffraction and microscopy experiments, the three other parameters (the average grain boundaries width, the phonon coherence length, and the electron coherence length) are extracted from the Raman data with the geometrical model proposed here. The broadly used intensity ratio between the C-C stretching (G band) and the defect-induced (D band) modes should be used to measure samples with crystallite sizes larger than the phonon coherence length, which is found equal to 32 nm. The Raman linewidth of the G band is more appropriate to characterize the crystallite sizes below the phonon coherence length, down to the average grain boundaries width, which is found to be 2.8 nm. “Ready-to-use” equations to determine the crystallite dimensions based on the Raman spectroscopy data are given.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 95, December 2015, Pages 646-652
نویسندگان
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