Optical band gap modification of single-walled carbon nanotubes by encapsulated fullerenes.
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.
Okazaki
Toshiya
T
Research Center for Advanced Carbon Materials, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan. toshi.okazaki@aist.go.jp
Okubo
Shingo
S
Nakanishi
Takeshi
T
Joung
Soon-Kil
SK
Saito
Takeshi
T
Otani
Minoru
M
Okada
Susumu
S
Bandow
Shunji
S
Iijima
Sumio
S
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
D037741:Fullerenes; D037742:Nanotubes, Carbon; C069837:fullerene C60