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Phys Rev Lett. 2000 Dec 18;85(25):5384-7.

One-dimensional metallofullerene crystal generated inside single-walled carbon nanotubes.

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1
Japan Science and Technology Corporation, Faculty of Science and Technology, Meijo University, Tenpaku-ku, Nagoya 468-8502, Japan.

Abstract

Electron microscope imaging for gadolinium metallofullerenes encapsulating in single-wall carbon nanotubes [(Gd@C82)n@SWNTs] identifies the single Gd atom encaged in each. The intermolecular distance between Gd@C82 is extremely regular, regarding the chains of Gd@C82 as novel one-dimensional crystals. Chemical state analysis of Gd atoms suggests evidence for charge transfer from Gd to either a fullerene cage or a nanotube. The slopes of the temperature dependence of electric resistance for the mat-like films of (Gd@C82)n@SWNTs and (C60)n@SWNTs are much steeper than that for empty SWNTs, suggesting the electron scattering due to the electrostatic potential from inside fullerenes playing an important role.

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