TY - JOUR
T1 - Narrow and intense resonances in the low-frequency region of surface-enhanced Raman spectra of single-wall carbon nanotubes
AU - Puretzky, Alexander A.
AU - Geohegan, David B.
AU - Rouleau, Christopher M.
PY - 2010
Y1 - 2010
N2 - 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 from undecorated arrays. The linewidths of the resonances (down to 0.3 cm⊃-1) are ten 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.
AB - 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 from undecorated arrays. The linewidths of the resonances (down to 0.3 cm⊃-1) are ten 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.
UR - http://www.scopus.com/inward/record.url?scp=78651307737&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.82.245402
DO - 10.1103/PhysRevB.82.245402
M3 - Article
AN - SCOPUS:78651307737
SN - 1098-0121
VL - 82
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 24
M1 - 245402
ER -