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The G band appears as a double peak at 1,518 and 1,591 cm-1. The significant curvature in small diameter SWCNTs causes a shift to lower frequencies of the optical vibrations associated with transverse (perpendicular to the tube axis) atomic displacements (the G- band£©.Although to our knowledge, this splitting has not been observed experimentally for a (6,6) SWCNT, the G+ and G- band splitting (¡÷WG) has been predicted to be 83 cm-1 (ref. 28), in good agreement with the splitting that we observe (¡÷WG=73cm-1). The additional peaks in the range from 400 to 1,200 cm-1 have previously been observed and used as evidence for the presence of armchair SWCNTs, since no peak in this range is present for semiconducting tubes¡£ |
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RXMCDM: ½ð±Ò+1, ¶àлӦÖú£¡ 2014-08-28 13:00:42
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RXMCDM: ½ð±Ò+1, ¶àлӦÖú£¡ 2014-08-28 13:00:42
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