Wide range optical studies on transparent SWNT films

Borondics, Ferenc and Kamarás, Katalin and Chen, Z. and Rinzler, A. G. and Nikolou, M. and Tanner, D. B. (2004) Wide range optical studies on transparent SWNT films. In: Electronic Properties of Synthetic Nanostructures. Proceedings of the XVIIIth International Winterschool on Electronic Properties of Novel Materials. AIP Conference Proceedings (723). American Institute of Physics (AIP), New York, pp. 137-140.

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Abstract

We present transmission spectra from the far infrared through the ultraviolet region on freestanding SWNT films at temperatures between 40 and 300 K. Several interesting features are observed in the low-frequency part of the spectrum: the Drude-like frequency dependence of the metallic tubes as well as a (sample-dependent) peak in the conductivity around 0.01 eV. We also studied the accidental nitrate doping of the SWNT samples during purification by nitric acid. Asprepared purified samples exhibit increased metallic absorption and decreased interband transitions; these features disappear on heating in vacuum.

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