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
July 2005
Applied Physics Letters;7/25/2005, Vol. 87 Issue 4, p041908
Academic Journal
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 sp2 to sp3.


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