Bachilo Sergei M, Strano Michael S, Kittrell Carter, Hauge Robert H, Smalley Richard E, Weisman R Bruce
Department of Chemistry, Center for Nanoscale Science and Technology, and Center for Biological and Environmental Nanotechnology, Rice University, 6100 Main Street, Houston, TX 77005, USA.
Science. 2002 Dec 20;298(5602):2361-6. doi: 10.1126/science.1078727. Epub 2002 Nov 29.
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.
对在水性表面活性剂悬浮液中分离出的单壁碳纳米管（SWNTs）进行的荧光光谱测量显示，超过30种不同的半导体纳米管种类具有独特的电子吸收和发射跃迁。通过将这些荧光测量结果与共振拉曼数据相结合，每种光学跃迁都已被映射到特定的（n,m）纳米管结构。因此，光谱学可用于快速确定大量SWNT样品的详细组成，提供管径和手性角的分布情况。测得的跃迁频率与简单的理论预测有很大差异。这些偏差可能反映了三角翘曲和激子效应的综合作用。
