G-band resonant Raman study of 62 isolated single-wall carbon nanotubes Export

@article{citeulike:774213, abstract = {We report G -band resonance Raman spectra of single-wall carbon nanotubes (SWNTs) at the single-nanotube level. By measuring 62 different isolated SWNTs resonant with the incident laser; and having diameters d t ranging between 0.95 nm and 2.62 nm; we have conclusively determined the dependence of the two most intense G -band features on the nanotube structure. The higher-frequency peak is not diameter dependent (\"{I}‰ G + =1591\^{a}€‚cm -1 ); while the lower-frequency peak is given by \"{I}‰ G - =\"{I}‰ G + - C / d t 2 ; with C being different for metallic and semiconducting SWNTs ( C M > C S ). The peak frequencies do not depend on nanotube chiral angle. The intensity ratio between the two most intense features is in the range 0.1 < I \"{I}‰ G - / I \"{I}‰ G + < 0.3 for most of the isolated SWNTs (\^{a}ˆ¼90\%). Unusually high or low I \"{I}‰ G - / I \"{I}‰ G + ratios are observed for a few spectra coming from SWNTs under special resonance conditions; i.e.; SWNTs for which the incident photons are in resonance with the E 44 S interband transition and scattered photons are in resonance with E 33 S . Since the E ii values depend sensitively on both nanotube diameter and chirality; the ( n ; m ) SWNTs that should exhibit such a special G -band spectra can be predicted by resonance Raman theory. The agreement between theoretical predictions and experimental observations about these special G -band phenomena gives additional support for the ( n ; m ) assignment from resonance Raman spectroscopy.}, author = {Jorio, A. and Souza and Dresselhaus, G. and Dresselhaus, M. S. and Swan, A. K. and \~{A}œnl\~{a}¼, M. S. and Goldberg, B. B. and Pimenta, M. A. and Hafner, J. H. and Lieber, C. M. and Saito, R.}, citeulike-article-id = {774213}, citeulike-linkout-0 = {http://dx.doi.org/10.1103/PhysRevB.65.155412}, citeulike-linkout-1 = {http://link.aps.org/abstract/PRB/v65/i15/e155412}, citeulike-linkout-2 = {http://link.aps.org/pdf/PRB/v65/i15/e155412}, day = {29}, doi = {10.1103/PhysRevB.65.155412}, journal = {Physical Review B}, keywords = {cnt, raman, warping}, month = {March}, number = {15}, pages = {155412+}, posted-at = {2006-07-26 07:57:17}, priority = {2}, publisher = {American Physical Society}, title = {G-band resonant Raman study of 62 isolated single-wall carbon nanotubes}, url = {http://dx.doi.org/10.1103/PhysRevB.65.155412}, volume = {65}, year = {2002} }

TY - JOUR ID - citeulike:774213 L3 - citeulike-article-id:774213 N2 - We report G -band resonance Raman spectra of single-wall carbon nanotubes (SWNTs) at the single-nanotube level. By measuring 62 different isolated SWNTs resonant with the incident laser; and having diameters d t ranging between 0.95 nm and 2.62 nm; we have conclusively determined the dependence of the two most intense G -band features on the nanotube structure. The higher-frequency peak is not diameter dependent (ω G + =1591 cm -1 ); while the lower-frequency peak is given by ω G - =ω G + - C / d t 2 ; with C being different for metallic and semiconducting SWNTs ( C M > C S ). The peak frequencies do not depend on nanotube chiral angle. The intensity ratio between the two most intense features is in the range 0.1 < I ω G - / I ω G + < 0.3 for most of the isolated SWNTs (∼90%). Unusually high or low I ω G - / I ω G + ratios are observed for a few spectra coming from SWNTs under special resonance conditions; i.e.; SWNTs for which the incident photons are in resonance with the E 44 S interband transition and scattered photons are in resonance with E 33 S . Since the E ii values depend sensitively on both nanotube diameter and chirality; the ( n ; m ) SWNTs that should exhibit such a special G -band spectra can be predicted by resonance Raman theory. The agreement between theoretical predictions and experimental observations about these special G -band phenomena gives additional support for the ( n ; m ) assignment from resonance Raman spectroscopy. IS - 15 JF - Physical Review B TI - G-band resonant Raman study of 62 isolated single-wall carbon nanotubes PB - American Physical Society VL - 65 SP - 155412 KW - cnt KW - raman KW - warping AU - Jorio, A AU - Souza AU - Dresselhaus, G AU - Dresselhaus, MS AU - Swan, AK AU - Ünlã¼, MS AU - Goldberg, BB AU - Pimenta, MA AU - Hafner, JH AU - Lieber, CM AU - Saito, R PY - 2002/03/29/ UR - http://dx.doi.org/10.1103/PhysRevB.65.155412 ER -