Double resonance features in the Raman spectrum of carbon nanotubes Export

@article{citeulike:774198, abstract = {A weak feature is observed in the Raman spectra of single-wall carbon nanotube bundles at a frequency between 1410 and 1430\ \ cm\&\#150;1. The band shifts slightly toward lower frequencies as the excitation energy increases from 2.17 to 2.71\ \ eV. An inverse correlation is found between the frequency of the band and that of the average radial-breathing mode, indicating a dependence on the nanotube diameter. The frequency can be extrapolated quadratically to 1487\ \ cm\&\#150;1 for infinite diameter. Two different hypotheses are considered, ascribing the band to modes around either K or M points of the graphite dispersion relations. The appearance of a band close to 1480\ \ cm\&\#150;1 in defective graphite and its dependence with the laser energy, as well as the strong sensitivity of high-frequency K-point modes to structural or impurity defects, support the interpretation of the mode as arising from for the upper phonon branch of graphite around the K point activated by the double-resonance mechanism.}, author = {Sanjuan, M. L. and Anson, A. and Martinez, M. T.}, citeulike-article-id = {774198}, citeulike-linkout-0 = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000070000020201404000001&idtype=cvips&gifs=yes}, citeulike-linkout-1 = {http://link.aps.org/abstract/PRB/v70/e201404}, citeulike-linkout-2 = {http://dx.doi.org/10.1103/PhysRevB.70.201404}, doi = {10.1103/PhysRevB.70.201404}, journal = {Physical Review B (Condensed Matter and Materials Physics)}, keywords = {cnt, raman}, number = {20}, posted-at = {2006-07-26 07:10:39}, priority = {2}, publisher = {APS}, title = {Double resonance features in the Raman spectrum of carbon nanotubes}, url = {http://dx.doi.org/10.1103/PhysRevB.70.201404}, volume = {70}, year = {2004} }

TY - JOUR ID - citeulike:774198 L3 - citeulike-article-id:774198 N2 - A weak feature is observed in the Raman spectra of single-wall carbon nanotube bundles at a frequency between 1410 and 1430  cm–1. The band shifts slightly toward lower frequencies as the excitation energy increases from 2.17 to 2.71  eV. An inverse correlation is found between the frequency of the band and that of the average radial-breathing mode, indicating a dependence on the nanotube diameter. The frequency can be extrapolated quadratically to 1487  cm–1 for infinite diameter. Two different hypotheses are considered, ascribing the band to modes around either K or M points of the graphite dispersion relations. The appearance of a band close to 1480  cm–1 in defective graphite and its dependence with the laser energy, as well as the strong sensitivity of high-frequency K-point modes to structural or impurity defects, support the interpretation of the mode as arising from for the upper phonon branch of graphite around the K point activated by the double-resonance mechanism. IS - 20 JF - Physical Review B (Condensed Matter and Materials Physics) TI - Double resonance features in the Raman spectrum of carbon nanotubes PB - APS VL - 70 KW - cnt KW - raman AU - Sanjuan, ML AU - Anson, A AU - Martinez, MT PY - 2004/// UR - http://dx.doi.org/10.1103/PhysRevB.70.201404 ER -