Hedderman Theresa G, Keogh Sinead M, Chambers Gordon, Byrne Hugh J
Focas Institute/School of Physics, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland.
J Phys Chem B. 2006 Mar 9;110(9):3895-901. doi: 10.1021/jp055647q.
Solubilization of single walled carbon nanotubes (SWNT) in the presence of polycyclic aromatic hydrocarbons (PAHs) such as p-terphenyl and anthracene has been shown. The suspensions formed are stable for periods greater than 48 months but to date experimental research is scarce regarding the interactions that are taking place. Spectroscopic analysis such as Raman and fluorescence are used to probe the interactions occurring between the PAHs and the SWNT over a wide concentration range. Previous studies show the fluorescence of the PAHs is quenched on interaction with SWNT and in the case of p-terphenyl, the spectrum is red shifted. This result prompted a study of a large range of concentrations to quantify the degree of interaction between the SWNT and PAHs. It was found at high concentrations that both the PAHs and SWNT formed aggregates and at lower concentrations it was found that free PAHs and isolated SWNT were interacting. The radial breathing modes (RBMs) in Raman spectroscopy gave detail as to how diameter selective the PAH samples are when compared to the pristine SWNT modes. An increase in the wavenumber of the RBMs for both composite spectra was observed and it is believed that such a result is due to the debundling of the SWNT on interaction with the PAHs. It was also found that anthracene and p-terphenyl selectively interact with SWNT and the selected SWNT were found to be within a distinct diameter range and possessed unique physical properties.
已证明单壁碳纳米管（SWNT）在多环芳烃（PAH）如对三联苯和蒽存在下可溶解。形成的悬浮液在超过48个月的时间内是稳定的，但迄今为止，关于正在发生的相互作用的实验研究很少。诸如拉曼光谱和荧光光谱等光谱分析方法被用于探测在很宽浓度范围内PAH与SWNT之间发生的相互作用。先前的研究表明，PAH与SWNT相互作用时其荧光会猝灭，对于对三联苯而言，其光谱会发生红移。这一结果促使人们对大范围浓度进行研究，以量化SWNT与PAH之间的相互作用程度。研究发现，在高浓度下，PAH和SWNT都会形成聚集体，而在低浓度下，发现游离的PAH和孤立的SWNT会发生相互作用。拉曼光谱中的径向呼吸模式（RBM）详细说明了与原始SWNT模式相比，PAH样品对直径的选择性如何。观察到两种复合光谱的RBM波数都有所增加，据信这一结果是由于SWNT与PAH相互作用时发生了解束。还发现蒽和对三联苯会选择性地与SWNT相互作用，并且所选择的SWNT直径在一个特定范围内，具有独特的物理性质。
