General equation for the determination of the crystallite size La of nanographite by Raman spectroscopy
Luiz Gustavo Cançado(Tokyo Institute of Technology), Kazuyuki Takai(Tokyo Institute of Technology), Toshiaki Enoki(Tokyo Institute of Technology), Morinobu Endo(Shinshu University), Yoong Ahm Kim(Shinshu University), Hiroshi Mizusaki(Shinshu University), Ado Jório(Universidade Federal de Minas Gerais), L. N. Coelho(Universidade Federal de Minas Gerais), R. Magalhães‐Paniago(Universidade Federal de Minas Gerais), M. A. Pimenta(Universidade Federal de Minas Gerais)
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Abstract
This work presents a systematic study of the ratio between the integrated intensities of the disorder-induced D and G Raman bands (ID∕IG) in nanographite samples with different crystallite sizes (La) and using different excitation laser energies. The crystallite size La 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 La using any laser energy in the visible range is obtained. Moreover, it is shown that ID∕IG is inversely proportional to the fourth power of the laser energy used in the experiment.
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