Length-dependent optical effects in single-wall carbon nanotubes
Length-dependent optical effects in single-wall carbon nanotubes
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DOI：
10.1021/ja073115c
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发表时间：
2007-08-29
影响因子：
15
通讯作者：
Hobbie, Erik K.
中科院分区：
文献类型：
--
作者：
Fagan, Jeffrey A.;Simpson, Jeffrey R.;Hobbie, Erik K.
在单壁碳纳米管（SWCNTs）的新颖化学和物理属性中，光学性质可能是最引人注目的。尽管我们对这些特性如何依赖于纳米管的手性和直径了解得很多，但对光学响应如何依赖于长度（下一个最明显和最基本的纳米管特性）却知之甚少。我们在这里表明，单壁碳纳米管的固有的光学响应表现出强烈的依赖于纳米管的长度，我们提供了一个简单的解释，这种行为与本地化的束缚激子沿着的长度的纳米管。这里提出的结果表明，对于一个给定的体积分数，最长的纳米管显示显着增强的吸收，近红外荧光，和拉曼散射，这具有重要的实际意义的潜在应用，寻求利用独特的光学特性的单壁碳纳米管。
Among the novel chemical and physical attributes of single-wall carbon nanotubes (SWCNTs), the optical properties are perhaps the most compelling. Although much is known about how such characteristics depend on nanotube chirality and diameter, relatively little is known about how the optical response depends on length, the next most obvious and fundamental nanotube trait. We show here that the intrinsic optical response of single-wall carbon nanotubes exhibits a strong dependence on nanotube length, and we offer a simple explanation that relates this behavior to the localization of a bound exciton along the length of a nanotube. The results presented here suggest that, for a given volume fraction, the longest nanotubes display significantly enhanced absorption, near-infrared fluorescence, and Raman scattering, which has important practical implications for potential applications that seek to exploit the unique optical characteristics of SWCNTs.