Journal
APPLIED PHYSICS LETTERS
Volume 79, Issue 23, Pages 3845-3847Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1415770
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Metallofullerene nanotube peapods were prepared by introducing Dy@C-82 into the interior space of single-walled carbon nanotubes. Transport measurements show that the Dy@C-82 molecules function as electron donors and transfer charge to the carbon nanotube host. The amount of charge transferred varies with the temperature. At room temperature, the doped nanotube shows p-type behavior as seen from the response to a back gate. As the temperature decreases, the conductance becomes n type and at T < 215 K metallic behavior is observed, indicating the degenerate state by doping. Below about 75 K, single-electron charging phenomena dominate the transport and show irregular Coulomb blockade oscillation, implying that the insertion of Dy@C-82 splits the tube into a series of several quantum dots. (C) 2001 American Institute of Physics.
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