title: Investigation of ultraviolet optical properties of semiconducting-enriched and metal-enriched single-walled carbon nanotube networks using spectroscopic ellipsometry.
abstract: The ultraviolet optical properties of semiconducting-enriched and metallic-enriched single-walled carbon nanotube (semi-enriched and m-enriched SWCNT) networks were studied using spectroscopic ellipsometry. According to calculated energy loss function, the energy loss peak assigned to the maximum intensity of π-plasmon energy was found to increase from 4.5 eV to 5.0 eV as SWCNT network composition was changed from m-SWCNT enriched to semi-SWCNT enriched. These results clearly demonstrate that the dielectric response in the 4-6 eV range is sensitive to changes in the surrounding dielectric environment depending on the semi-/m-SWCNT content. Therefore, the spectral shift of this energy loss is attributed to the enhanced electron confinement by the presence of the surface plasmon due to a small amount of m-SWCNT, which is an important phenomenon at the SWCNT network.
authors.affiliation: School of Electrical Engineering, Korea University, Seoul 136-701, Republic of Korea.
authors.forename: Young Ran
authors.initials: YR
authors.lastname: Park
authors.forename: Woo-Jae
authors.initials: WJ
authors.lastname: Kim
authors.forename: Min Jae
authors.initials: MJ
authors.lastname: Ko
authors.forename: Nam Ki
authors.initials: NK
authors.lastname: Min
authors.forename: Cheol Jin
authors.initials: CJ
authors.lastname: Lee