Nano Archive

Optical properties of ultrashort semiconducting single-walled carbon nanotube capsules down to sub-10 nm

Sun, Xiaoming and Zaric, Sasa and Daranciang, Dan and Welsher, Kevin and Lu, Yuerui and Li, Xiaolin and Dai, Hongjie (2008) Optical properties of ultrashort semiconducting single-walled carbon nanotube capsules down to sub-10 nm. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 130 (20). pp. 6551-6555.

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Official URL: http://dx.doi.org/10.1021/ja8006929

Abstract

Single-walled carbon nanotubes (SWNTs) are typically long (greater than or similar to 100 nm) and have been well established as novel quasi one-dimensional systems with interesting electrical, mechanical, and optical properties. Here, quasi zero-dimensional SWNTs with finite lengths down to the molecular scale (7.5 nm in average) were obtained by length separation using a density gradient ultracentrifugation method. Different sedimentation rates of nanotubes with different lengths in a density gradient were taken advantage of to sort SWNTs according to length. Optical experiments on the SWNT fractions revealed that the UV-vis-NIR absorption and photoluminescence peaks of the ultrashort SWNTs blue-shift up to similar to 30 meV compared to long nanotubes, owing to quantum confinement effects along the length of ultrashort SWNTs. These nanotube capsules essentially correspond to SWNT quantum dots.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Physical Science > Nano objects
ID Code:2975
Deposited By:Anuj Seth
Deposited On:12 Jan 2009 12:06
Last Modified:20 Jan 2009 11:56

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