Light-induced instability of PbO-filled single-wall carbon nanotubes

Hulman, Martin; Kuzmany, Hans; Costa, Pedro M. F. J.; Friedrichs, Steffi; Green, Malcolm L. H.
September 2004
Applied Physics Letters;9/13/2004, Vol. 85 Issue 11, p2068
Academic Journal
We investigated single-wall carbon nanotubes filled with lead oxide, PbO, by transmission electron microscopy and Raman spectroscopy. It is concluded that PbO crystallizes in the orthorombic phase forming nanowires inside the nanotubes. The positions of the PbO Raman lines are downshifted as compared to the bulk material as a result of the reduced dimensionality. As a consequence of the filling, nanotubes become sensitive to the laser irradiation. At higher laser power densities, they oxidize and the free PbO nanowires are left in the sample.


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