Temperature-induced change from p to n conduction in metallofullerene nanotube peapods

Chiu, P. W.; Gu, G.; Kim, G. T.; Philipp, G.; Roth, S.; Yang, S. F.; Yang, S.
December 2001
Applied Physics Letters;12/3/2001, Vol. 79 Issue 23, p3845
Academic Journal
Metallofullerene nanotube peapods were prepared by introducing Dy@C[sub 82] into the interior space of single-walled carbon nanotubes. Transport measurements show that the Dy@C[sub 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[sub 82] splits the tube into a series of several quantum dots. © 2001 American Institute of Physics.


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