Nano Archive

Length-dependent optical effects in single-wall carbon nanotubes

Fagan, Jeffrey A. and Simpson, Jeffrey R. and Bauer, Barry J. and Lacerda, Silvia H. De Paoli and Becker, Matthew L. and Chun, Jaehun and Migler, Kalman B. and Walker, Angela R. Hight and Hobbie, Erik K. (2007) Length-dependent optical effects in single-wall carbon nanotubes. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 129 (34). pp. 10607-10612.

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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.

Item Type:Article
Subjects:Physical Science > Nano objects
Physical Science > Photonics
ID Code:3184
Deposited By:Anuj Seth
Deposited On:26 May 2009 13:36
Last Modified:26 May 2009 13:36

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