LENGTH DEPENDENT PROPERTIES OF CARBON NANOTUBES: CHARACTERIZATION AND IMPLICATIONS

 

Dr. Jeffrey Fagan

Sponsor: Dr. Erik Hobbie

Polymers Division

Material Science and Engineering Laboratory

Building 224, Office A225

MS 8542

301-975-6740

Fax: 301-975-4942

Jeffrey.fagan@nist.gov

 

Not a Sigma Xi member

Category: Materials

 

The intrinsic optical properties of single wall carbon nanotubes in solution are demonstrated to depend on the contour length of the nanotubes.  Absorbance, fluorescence and Raman scattering measurements on individually-dispersed, length-sorted tubes display significant increases of these archetypical nanotube optical features with tube length.  Surprisingly, these changes occur at a length scale much greater than that predicted by theoretical models and simulations.  The demonstrated length dependence of these properties has extensive implications for the characterization and use of these materials, including purity evaluation, optimization of expected properties, and in the selection of nanotube populations for medical applications.