Structure-assigned optical spectra of single-walled carbon nanotubes
Structure-assigned optical spectra of single-walled carbon nanotubes
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DOI：
10.1126/science.1078727
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发表时间：
2002-12-20
期刊：
影响因子：
56.9
通讯作者：
Weisman, RB
中科院分区：
文献类型：
--
作者：
Bachilo, SM;Strano, MS;Weisman, RB
对表面活性剂悬浮液中分离的单壁碳纳米管（SWNTs）的荧光光谱测量揭示了30多种不同半导体纳米管物种的不同电子吸收和发射跃迁。通过将这些荧光结果与共振拉曼数据相结合，每个光学跃迁都被映射到特定的（n,m）纳米管结构。因此，光谱学可以用来快速确定大块SWNT样品的详细组成，提供管直径和手性角的分布。测量到的跃迁频率与简单的理论预测有很大不同。这些偏差可能反映了三角翘曲和激子效应的结合。
Spectrofluorimetric measurements on single-walled carbon nanotubes (SWNTs) isolated in aqueous surfactant suspensions have revealed distinct electronic absorption and emission transitions for more than 30 different semiconducting nanotube species. By combining these fluorimetric results with resonance Raman data, each optical transition has been mapped to a specific (n,m) nanotube structure. Optical spectroscopy can thereby be used to rapidly determine the detailed composition of bulk SWNT samples, providing distributions in both tube diameter and chiral angle. The measured transition frequencies differ substantially from simple theoretical predictions. These deviations may reflect combinations of trigonal warping and excitonic effects.