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arXiv 1306.3337cond-mat.mes-hall
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碳纳米管吸收截面的手性依赖性

Chirality dependence of the absorption cross-section of carbon nanotubes

Fabien Vialla, Cyrielle Roquelet, Benjamin Langlois, Géraud Delport, Silvia Morim Santos, Emmanuelle Deleporte, Philippe Roussignol, Claude Delalande, Christoph… 展开作者

Fabien Vialla, Cyrielle Roquelet, Benjamin Langlois, Géraud Delport, Silvia Morim Santos, Emmanuelle Deleporte, Philippe Roussignol, Claude Delalande, Christophe Voisin, Jean-Sébastien Lauret

摘要:

碳纳米管的光学吸收随其几何形状的变化一直是一个长期存在的问题,在这两个问题的核心和应用,特别是因为光学光谱是用于评估样品的手性物种丰度的主要工具之一。在这里,我们解决了手性依赖的光吸收与一个原始的方法,涉及超高效的能量转移卟啉/纳米管化合物,允许均匀的光激发的所有手性物种。我们测量的绝对吸收截面的范围很广的半导体纳米管在其S22过渡,并表明,它的变化高达2.2的因素与手性角,与I型纳米管显示出较大的吸收。相反,发光量子产率几乎保持恒定。

英文摘要:

The variation of the optical absorption of carbon nanotubes with their geometry has been a long standing question at the heart of both metrological and applicative issues, in particular because optical spectroscopy is one of the primary tools for the assessment of the chiral species abundance of samples. Here, we tackle the chirality dependence of the optical absorption with an original method involving ultra-efficient energy transfer in porphyrin/nanotube compounds that allows uniform photo-excitation of all chiral species. We measure the absolute absorption cross-section of a wide range of semiconducting nanotubes at their S22 transition and show that it varies by up to a factor of 2.2 with the chiral angle, with type I nanotubes showing a larger absorption. In contrast, the luminescence quantum yield remains almost constant.

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