Chirality Changes in Carbon Nanotubes Studied with Near-Field Raman Spectroscopy
- 27 February 2007
- journal article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 7 (3), 577-582
- https://doi.org/10.1021/nl0622496
Abstract
We report on the direct visualization of chirality changes in carbon nanotubes by mapping local changes in resonant RBM phonon frequencies with an optical resolution of 40 nm using near-field Raman spectroscopy. We observe the transition from semiconducting-to-metal and metal-to-metal chiralities at the single nanotube level. Our experimental findings, based on detecting changes in resonant RBM frequencies, are complemented by measuring changes in the G-band frequency and line shape. In addition, we observe increased Raman scattering due to local defects associated with the structural transition. From our results, we determine the spatial extent of the transition region to be Ltrans ∼ 40−100 nm.This publication has 18 references indexed in Scilit:
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