Raman frequency shift in oxygen functionalized carbon nanotubes

Details Raman frequency shift in oxygen functionalized carbon nanotubes Raman frequency shift in oxygen functionalized carbon nanotubes

2007-01-16

arxiv.org/abs/cond-mat/0701359v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, 1 table

Scientific paper

10.1088/0957-4484/18/46/465706

In terms of lattice dynamics theory, we study the vibrational properties of the oxygen-functionalized single wall carbon nanotubes (O-SWCNs). Due to the C-O and O-O interactions, many degenerate phonon modes are split and even some new phonon modes are obtained, different from the bare SWCNs. A distinct Raman shift is found in both the radial breathing mode and G modes, depending not only on the tube diameter and chirality but also on oxygen coverage and adsorption configurations. With the oxygen coverage increasing, interesting, a nonmonotonic up- and down-shift is observed in G modes, which is contributed to the competition between the bond expansion and contraction, there coexisting in the functionalized carbon nanotube.

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