Narrow and Intense Resonances in the Low Frequency Region of Surface Enhanced Raman Spectra of Single Wall Carbon Nanotubes
- ORNL
Previously unexplored low-frequency Raman modes of single wall carbon nanotubes (SWNTs) are reported. Gold deposited onto a randomly oriented top layer of vertically aligned carbon nanotube arrays was used to induce surface enhanced Raman scattering (SERS) 'hot spots' on large-diameter SWNTs with SERS intensities up to 1900 times greater than normal Raman intensities. The linewidths of the resonances (down to 0.3 cm-1) are 10 times narrower than previously measured for individual SWNTs. Pairs of intense sharp resonances with identical excitation profiles were found and tentatively interpreted as the low-energy longitudinal optical and radial breathing modes of the same nanotube. SERS lines in the region of 14-30 cm-1 were tentatively assigned to the ring modes of SWNTs in agreement with existing theories
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1000299
- Journal Information:
- Physical Review B, Vol. 82, Issue 24; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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