Narrow and Intense Resonances in the Low Frequency Region of Surface Enhanced Raman Spectra of Single Wall Carbon Nanotubes

Journal Article · Fri Jan 01 04:00:00 EST 2010 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.82.245402· OSTI ID:1000299

Puretzky, Alexander A ^[1]; Geohegan, David B ^[1]; Rouleau, Christopher M ^[1]

---

1. 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 Laboratory (ORNL); Center for Nanophase Materials Sciences
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1000299
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 24 Vol. 82; ISSN 1098-0121; ISSN 1550-235X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
CARBON
EXCITATION
GOLD
NANOTUBES
RAMAN SPECTRA
SPECTRAL RESPONSE