Infrared absorption properties of carbon nanotubes synthesized by chemical vapor deposition

Kouklin, N.; Tzolov, M.; Straus, D.; Yin, A.; Xu, J. M.
November 2004
Applied Physics Letters;11/8/2004, Vol. 85 Issue 19, p4463
Academic Journal
We present an infrared (IR) optical absorbance study of highly uniform nanotubes grown by chemical vapor deposition in the self-assembled porous matrix in alumina. For unambiguous IR spectral measurement, nanotubes were extracted from their growth template, purified, and evenly dispersed on a reflecting substrate. The findings, which are consistent with previous results from conduction studies, reveal that the nanotubes are semiconducting with a band gap of ∼100 meV. This suggests the potential of nanotube arrays for IR electro-optical device applications.


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