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Raman identification of onion-like carbon

✍ Scribed by E.D. Obraztsova; M. Fujii; S. Hayashi; V.L. Kuznetsov; Yu.V. Butenko; A.L. Chuvilin

Book ID: 104107379
Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 681 KB
Volume: 36
Category: Article
ISSN: 0008-6223
DOI: 10.1016/s0008-6223(98)00014-1

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✦ Synopsis

A specific Raman spectrum of carbon spherical shells (onions) synthesized by annealinginduced (T= 1800 K) chipping off the outer carbon layers from 5-nm size diamond particles has been observed. It shows a clearly seen band at 1572 cn-'. Its downshift from the position 1582 cm-' (known for a pure graphite) is interpreted as an influence of shell curvature. The summary contribution of the shells constituting the S-nm diameter onion is estimated. A narrowness (FWHM = 15 cm-') of the first order Raman band of onions together with a dominance of the peak at 2712 cn-' (FWHM =65 cn-') in their second order spectrum point to a high degree of structural perfection of a graphitic network in shells.

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