Abstract
We have investigated the electronic structures of single-wall carbon nanotubes (SWCNTs) encapsulating C70 fullerene and metallofullerenes M@C82 (M = La, Gd, Dy), C70 peapods (C70@SWCNT) and metallofullerene peapods (M@C82@SWCNT), using photoemission spectroscopy. The photoemission spectra of C70 and M@C82 peas are obtained by subtracting the spectrum of pristine SWCNTs from those of the corresponding peapods. The electronic structure of the C70 peas is similar to that of the C70 film. For the M@C82 peapods, on the other hand, the electronic structures of the M@C82 peas are different. For the La@C82 peapods, the singly occupied molecular orbital (SOMO) for the La@C82 peas is located nearer to the Fermi level when compared with that in the La@C82 film. For the Dy@C 82 peapods, the effective Dy valence is estimated to be +2.9. This result demonstrates that effective charges move back from the C82 cage to Dy following encapsulation of Dy@C82 peas in the SWCNTs because of the strong hybridization interaction between Dy 4f and C 2p electrons, taking into account the Dy valence of +3 in the Dy@C82 film.
| Original language | English |
|---|---|
| Pages (from-to) | 2025-2028 |
| Number of pages | 4 |
| Journal | Physica Status Solidi (B) Basic Research |
| Volume | 245 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - Oct 2008 |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Photoemission study of electronic structures of fullerene and metallofullerene peapods. / Nakayama, Yuji; Fujiki, Shinichiro; Hirado, Yasuharu; Shiozawa, Hidetsugu; Ishii, Hiroyoshi; Miyahara, Tsuneaki; Maniwa, Yutaka; Kodama, Takeshi; Achiba, Yoji; Kataura, Hiromichi; Kubozono, Yoshihiro; Nakatake, Masashi; Saitoh, Tomohiko.
In: Physica Status Solidi (B) Basic Research, Vol. 245, No. 10, 10.2008, p. 2025-2028.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Photoemission study of electronic structures of fullerene and metallofullerene peapods
AU - Nakayama, Yuji
AU - Fujiki, Shinichiro
AU - Hirado, Yasuharu
AU - Shiozawa, Hidetsugu
AU - Ishii, Hiroyoshi
AU - Miyahara, Tsuneaki
AU - Maniwa, Yutaka
AU - Kodama, Takeshi
AU - Achiba, Yoji
AU - Kataura, Hiromichi
AU - Kubozono, Yoshihiro
AU - Nakatake, Masashi
AU - Saitoh, Tomohiko
PY - 2008/10
Y1 - 2008/10
N2 - We have investigated the electronic structures of single-wall carbon nanotubes (SWCNTs) encapsulating C70 fullerene and metallofullerenes M@C82 (M = La, Gd, Dy), C70 peapods (C70@SWCNT) and metallofullerene peapods (M@C82@SWCNT), using photoemission spectroscopy. The photoemission spectra of C70 and M@C82 peas are obtained by subtracting the spectrum of pristine SWCNTs from those of the corresponding peapods. The electronic structure of the C70 peas is similar to that of the C70 film. For the M@C82 peapods, on the other hand, the electronic structures of the M@C82 peas are different. For the La@C82 peapods, the singly occupied molecular orbital (SOMO) for the La@C82 peas is located nearer to the Fermi level when compared with that in the La@C82 film. For the Dy@C 82 peapods, the effective Dy valence is estimated to be +2.9. This result demonstrates that effective charges move back from the C82 cage to Dy following encapsulation of Dy@C82 peas in the SWCNTs because of the strong hybridization interaction between Dy 4f and C 2p electrons, taking into account the Dy valence of +3 in the Dy@C82 film.
AB - We have investigated the electronic structures of single-wall carbon nanotubes (SWCNTs) encapsulating C70 fullerene and metallofullerenes M@C82 (M = La, Gd, Dy), C70 peapods (C70@SWCNT) and metallofullerene peapods (M@C82@SWCNT), using photoemission spectroscopy. The photoemission spectra of C70 and M@C82 peas are obtained by subtracting the spectrum of pristine SWCNTs from those of the corresponding peapods. The electronic structure of the C70 peas is similar to that of the C70 film. For the M@C82 peapods, on the other hand, the electronic structures of the M@C82 peas are different. For the La@C82 peapods, the singly occupied molecular orbital (SOMO) for the La@C82 peas is located nearer to the Fermi level when compared with that in the La@C82 film. For the Dy@C 82 peapods, the effective Dy valence is estimated to be +2.9. This result demonstrates that effective charges move back from the C82 cage to Dy following encapsulation of Dy@C82 peas in the SWCNTs because of the strong hybridization interaction between Dy 4f and C 2p electrons, taking into account the Dy valence of +3 in the Dy@C82 film.
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U2 - 10.1002/pssb.200879571
DO - 10.1002/pssb.200879571
M3 - Article
AN - SCOPUS:54949090383
VL - 245
SP - 2025
EP - 2028
JO - Physica Status Solidi (B): Basic Research
JF - Physica Status Solidi (B): Basic Research
SN - 0370-1972
IS - 10
ER -