Nano Archive

Translational and rotational dynamics of individual single-walled carbon nanotubes in aqueous suspension

Tsyboulski, Dmitri A. and Bachilo, Sergei M. and Kolomeisky, Anatoly B. and Weisman, R. Bruce (2008) Translational and rotational dynamics of individual single-walled carbon nanotubes in aqueous suspension. ACS NANO, 2 (9). pp. 1770-1776.

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Near-infrared fluorescence videomicroscopy has been used to study simultaneously the translational and rotational diffusion of individual semiconduding single-walled carbon nanotubes (SWCNTs) in aqueous suspension. Analysis of translational trajectories revealed diffusion coefficient values from approximately 0.3 to 6 mu m(2)/s. The nanotube lengths deduced from these values ranged between similar to 130 nm and 6 mu m. From the minor bending motions observed in individual nanotubes several micrometers in length, we confirmed that the shorter SWCNTs of primary interest here can be considered to be rigid rods under normal conditions. Because the nanotubes act as highly rigid, photostable, steady, and anisotropic fluorophores, it was possible to monitor their rotational reorientations through fluctuations in emission intensity under linearly polarized excitation. The magnitudes of observed orientational fluctuations varied substantially among individual nanotubes. These magnitudes correlated strongly with translational diffusion coefficient, reflecting the length dependence of both types of motions. Combined translational and rotational measurements also revealed the influence of local environment on nanotube mobility.

Item Type:Article
Uncontrolled Keywords:single-walled carbon nanotubes; SWCNT; fluorescence microscopy; single-nanotube imaging; diffusion; rotation; Brownian motion
Subjects:Analytical Science > Microscopy and probe methods
Physical Science > Nano objects
Material Science > Nanochemistry
ID Code:2960
Deposited By:Anuj Seth
Deposited On:13 Jan 2009 09:23
Last Modified:20 Jan 2009 14:23

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