Relative optical absorption of metallic and semiconducting single-walled carbon nanotubes

Houjin Huang; Hisashi Kajiura; Ryuichiro Maruyama; Koji Kadono; Kazuhiro Noda

doi:10.1021/jp054839i

Relative optical absorption of metallic and semiconducting single-walled carbon nanotubes

J Phys Chem B. 2006 Mar 16;110(10):4686-90. doi: 10.1021/jp054839i.

Authors

Houjin Huang¹, Hisashi Kajiura, Ryuichiro Maruyama, Koji Kadono, Kazuhiro Noda

Affiliation

¹ Materials Laboratories, Sony Corporation, Atsugi Tec. No. 2, 4-16-1 Okata Atsugi, Kanagawa 243-0021, Japan. houjinhuang@yahoo.co.uk

PMID: 16526703
DOI: 10.1021/jp054839i

Abstract

While it is well-known that tube-tube interaction causes changes (peak red-shift and suppression) in the optical absorption of single-walled carbon nanotubes (SWNTs), we found in this work that, upon bundling, the optical absorption of metallic SWNTs (M11) is less affected compared to their semiconducting counterparts (S11 or S22), resulting in enhanced absorbance ratio of metallic and semiconducting SWNTs (A(M)/A(S)). Annealing of the SWNTs increases this ratio due to the intensified tube-tube interaction. We have also found that the interaction between SWNTs and the surfactant Triton X-405 has a similar effect. The evaluation of SWNT separation by types (metallic or semiconducting) based on the optical absorption should take these effects into account.