Luo Zhengtang, Pfefferle Lisa D, Haller Gary L, Papadimitrakopoulos Fotios
Nanomaterials Optoelectronics Laboratory, Department of Chemistry, Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA.
J Am Chem Soc. 2006 Dec 6;128(48):15511-6. doi: 10.1021/ja0657096.
A methodology that takes into account the (n,m) structure of single-walled carbon nanotubes (SWNTs), through an exciton-exciton resonance model and an electron-phonon interaction model, was employed in order to evaluate the semiconducting (n,m) abundance of two SWNT samples (i.e., Co-MCM-41 and HiPco). This was based on photoluminescence and near-infrared absorption data obtained on aqueous suspensions of individually dispersed SWNTs. In the absence of known (n,m) abundance SWNT samples, we resorted to determining the diameter distribution curves for both samples, which were found to obey an unsymmetrical log-normal distribution, typical for vapor-phase particle growth. Using this log-normal function, we reconstructed the near-infrared E S11 absorption spectrum of the narrow diameter distribution Co-MCM-41 SWNT sample, which in turn enabled us to assess the predictions of these two theoretical models. High spectral reconstruction accuracy was obtained from the electron-phonon interaction model when considering (11,0) and (10,0) zigzag nanotubes, along with (n,m) line widths inversely proportional to their extinction coefficients.
通过激子 - 激子共振模型和电子 - 声子相互作用模型，采用一种考虑单壁碳纳米管（SWNTs）(n,m)结构的方法，来评估两个SWNT样品（即Co - MCM - 41和HiPco）的半导体(n,m)丰度。这是基于在单独分散的SWNTs水悬浮液上获得的光致发光和近红外吸收数据。在没有已知(n,m)丰度的SWNT样品的情况下，我们通过确定两个样品的直径分布曲线来解决问题，发现它们服从非对称对数正态分布，这是气相颗粒生长的典型分布。使用该对数正态函数，我们重建了窄直径分布的Co - MCM - 41 SWNT样品的近红外E S11吸收光谱，这反过来又使我们能够评估这两个理论模型的预测。当考虑(11,0)和(10,0)锯齿形纳米管以及(n,m)线宽与其消光系数成反比时，从电子 - 声子相互作用模型获得了高光谱重建精度。
