کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5396856 | 1505770 | 2008 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A methodology to optimize the quantification of sp2 carbon fraction from K edge EELS spectra
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: A methodology to optimize the quantification of sp2 carbon fraction from K edge EELS spectra A methodology to optimize the quantification of sp2 carbon fraction from K edge EELS spectra](/preview/png/5396856.png)
چکیده انگلیسی
A methodology is presented to select a consistent method, using electron energy loss spectroscopy (EELS), to extract the fraction of sp2-bonded carbon atoms in carbonaceous materials. According to this methodology, a reliable method has to conjointly fulfill two criteria. The first one consists in verifying, on a perfect graphite sample, that the experimental evolution of RÂ =Â IÏ*/(IÏ*Â +Â IÏ*)-ratios is in good agreement with the one theoretically predicted as a function of experimental settings. The second criterion consists in measuring sp2 fractions in amorphous carbon samples with a minimum of fluctuation. We test three commonly used R-extraction techniques, and we show that they exhibit some failures. We thus implement a more accurate R-extraction process that accounts for the predicted graphite R-evolution and exhibits a low intrinsic 4%-noise, as determined from the sp2 fraction fluctuation. Moreover, we check the transferability of our method on a wide range of EELS spectra, acquired with different experimental resolutions on samples exhibiting various sp2 contents.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 164, Issues 1â3, July 2008, Pages 34-43
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 164, Issues 1â3, July 2008, Pages 34-43
نویسندگان
N. Bernier, F. Bocquet, A. Allouche, W. Saikaly, C. Brosset, J. Thibault, A. Charaï,