II International Symposium on Carbon for Catalysis ABSTRACTS

OP-I-28
In 1970 Koenig et al have established a relationship between the ratio of intensities of G
(1580 cm -1 ) and D (1350 cm -1 ) lines in the Raman spectra of various disordered sp 2 carbons
and the size of micro-crystallites in the basal plane L a [1]. The latter was measured by the
WAXD method. Applicability of this relationship has been investigated by us, using the
results of linear and planar Raman micro-mapping carried out for many samples of graphite of
different origin and for other sp 2 -carbon modifications. The typical spectra of less-ordered sp 2
carbon materials presented in Fig. 2 and 3 demonstrate their difference from the graphite
spectrum.
Fig.2 Raman spectrum of glassy carbon
Fig.3 Raman spectra of smoke-black
1319
1588
1334
1589
1105
900 1200 1500 1800
Δν, cm -1
800 1000 1200 1400 1600 1800
Δν, cm -1
The data obtained show that Koenig’s correlation is not applicable to the crystallite
size estimation. Spectral criteria have been elaborated for identification of various sp 2
carbon materials, based on the position, widths and contour of the D and G bands as well as
I D /I G intensity ratio.
Acknowledgements
The authors acknowledge partial financial support from the Russian Foundation for Basic
Research (grant 04-03-32879) and from the program “Scientific School Support”
(grant NSh-1765.2003.3).
References
[1] F. Tuinstra, J.L. Koenig, J. Chem. Phys. 1970, 53, 1126.
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