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This grant supports our investigation on the dielectric properties of CNTs and the mechanism of dielectric property-based separation of carbon nanotubes. The study on these fundamental questions will lead to efficient separation of metallic from semiconducting tubes and ultimately improve alternative energy devices. In 2009 report, the grant support has resulted in a publication “Length-Dependent Dielectric Polarization in Metallic Single-Walled Carbon Nanotubes” by Wei Lu, Yao Xiong, and Liwei Chen J. Phys. Chem. C, Vol. 113, No. 24, 2009. In the last year of this grant, it was used to support a Ph.D. student Yunxiang Gao to finish his last year of dissertation. The topic of Gao's research was an integral part of the proposed research of this grant. His part is to understand the reactivity of fluorinated single-walled carbon nanotubes and take advantage of this unusual reactivity to make crosslinked carbon nanotubes at ambient conditions. This has resulted in a manuscript and is currently in submission to Adv. Mat.