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  • Title: Optical properties of ultrashort semiconducting single-walled carbon nanotube capsules down to sub-10 nm.
    Author: Sun X, Zaric S, Daranciang D, Welsher K, Lu Y, Li X, Dai H.
    Journal: J Am Chem Soc; 2008 May 21; 130(20):6551-5. PubMed ID: 18426207.
    Abstract:
    Single-walled carbon nanotubes (SWNTs) are typically long (greater than or approximately equal 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 approximately 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.
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