Photoemission and inverse photoemission study of the electronic structure of C60 fullerenes encapsulated in single-walled carbon nanotubes

Shiozawa Hidetsugu

Ishii Hiroyoshi

Kihara Hideo

Sasaki Naoya

Nakamura Satoshi

Yoshida Tetsuo

Takayama Yasuhiro

Miyahara Tsuneaki

Suzuki Shinzo

Achiba Yohji

Kodama Takeshi

Higashiguchi Mitsuharu

Chi Xiaoyu

Nakatake Masashi

Shimada Kenya

Namatame Hirofumi

Taniguchi Masaki

Kataura Hiromichi

Physical Review B - Condensed Matter and Materials Physics

We have measured the valence-band photoemission and inverse photoemission spectra of single-walled carbon nanotubes (SWNTs) with mean radii of 0.7 and 0.64 nm encapsulating C60 fullerenes (peas), so-called "peapods." The photoemission spectrum of the C60 peas in the SWNTs is obtained by subtracting the spectrum of empty SWNTs from the spectrum of the peapod. The structures in the C60 pea spectra correspond well to those in the spectrum of a C60 face-centered-cubic solid. No structure is observed at binding energies ranging from the Fermi level (EF) to the onset of the highest occupied molecular orbital (HOMO) peak; the t1u level of the C60 peas inside the SWNT stays above EF.

fullerenes

carbon nanotubes

photoelectron spectra

inverse photoemission spectra

valence bands

binding energy

Fermi level

eng

American Physical Society

Copyright (c) 2006 The American Physical Society.

[ISSN] 0163-1829

[DOI] 10.1103/PhysRevB.73.075406

[NCID] AA11187113

[DOI] http://dx.doi.org/10.1103/PhysRevB.73.075406