title: Optical band gap modification of single-walled carbon nanotubes by encapsulated fullerenes.
abstract: We report optical band gap modifications of single-walled carbon nanotubes upon C60 insertions by using photoluminescence and the corresponding excitation spectroscopy. The shifts in optical transition energies strongly depend on the tube diameter (dt) and the "2n + m" family type, which can be explained by the local strain and the hybridization between the nanotube states and the C60 molecular orbitals. The present results provide possible design rules for nanotube-based heterostructures having a specific type of electronic functionality.
authors.affiliation: Research Center for Advanced Carbon Materials, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan. toshi.okazaki@aist.go.jp
authors.forename: Toshiya
authors.initials: T
authors.lastname: Okazaki
authors.forename: Shingo
authors.initials: S
authors.lastname: Okubo
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nakanishi
authors.forename: Soon-Kil
authors.initials: SK
authors.lastname: Joung
authors.forename: Takeshi
authors.initials: T
authors.lastname: Saito
authors.forename: Minoru
authors.initials: M
authors.lastname: Otani
authors.forename: Susumu
authors.initials: S
authors.lastname: Okada
authors.forename: Shunji
authors.initials: S
authors.lastname: Bandow
authors.forename: Sumio
authors.initials: S
authors.lastname: Iijima
mesh_terms: D037741:Fullerenes / Q000737:chemistry*; D049449:Luminescence; D046529:Microscopy, Electron, Transmission / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry*; D055095:Optics and Photonics; D010316:Particle Size; D013050:Spectrometry, Fluorescence / Q000379:methods; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D019265:Spectroscopy, Near-Infrared / Q000379:methods; D013059:Spectrum Analysis, Raman / Q000379:methods
chemical_list: D037741:Fullerenes; D037742:Nanotubes, Carbon; C069837:fullerene C60