Frequency-dependent optical constants and conductivities of hydrogen-functionalized single-walled carbon nanotubes

Chul Kang, In Hee Maeng, Seung Jae Oh, Joo Hiuk Son, Tae In Jeon, Kay Hyeok An, Seong Chu Lim, Young Hee Lee

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33 Scopus citations

Abstract

The frequency-dependent optical constants and electrical conductivities of hydrogen-functionalized single-walled carbon nanotubes (SWNTs) have been measured from the 0.2 to 1.5 THz region using a terahertz time domain spectroscopy. The indices of refraction and electrical conductivities of the sample after hydrogen functionalization were smaller than those of the sample before hydrogen functionalization. The experimental results were fitted using the Maxwell-Garnett model, and a reduction of plasma frequency was observed. This can be attributed to the fact that the hydrogen functionalization has reduced the number of free carriers with the bonding change from s p2 to s p3.

Original languageEnglish
Article number041908
JournalApplied Physics Letters
Volume87
Issue number4
DOIs
StatePublished - 25 Jul 2005

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