General equation for the determination of the crystallite size La of nanographite by Raman spectroscopy
General equation for the determination of the crystallite size La of nanographite by Raman spectroscopy
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DOI：
10.1063/1.2196057
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发表时间：
2006-04-17
影响因子：
4
通讯作者：
Pimenta, MA
中科院分区：
文献类型：
--
作者：
Cançado, LG;Takai, K;Pimenta, MA
本文系统地研究了不同晶粒尺寸（L-a）和不同激发激光能量下纳米石墨样品中无序诱导的D和G拉曼带积分强度之比（I-D/I-G）。纳米石墨样品的微晶尺寸L-a通过使用同步辐射的X射线衍射和直接从扫描隧道显微镜图像获得。得到了在可见光范围内用任何激光能量测定L-a的一般方程。此外，还证明了I-D/I-G与实验所用激光能量的四次方成反比。(c)2006年，美国物理学会。
This work presents a systematic study of the ratio between the integrated intensities of the disorder-induced D and G Raman bands (I-D/I-G) in nanographite samples with different crystallite sizes (L-a) and using different excitation laser energies. The crystallite size L-a of the nanographite samples was obtained both by x-ray diffraction using synchrotron radiation and directly from scanning tunneling microscopy images. A general equation for the determination of L-a using any laser energy in the visible range is obtained. Moreover, it is shown that I-D/I-G is inversely proportional to the fourth power of the laser energy used in the experiment. (c) 2006 American Institute of Physics.