Structure and transport properties of doping controlled carbon nanotube by encapsulation of organic molecules.
Abstract
It is widely accepted that single walled carbon nanotubes (SWNT) is one of the most important materials for molecule-based electronics. Here we report integration of organic molecules into SWNT makes air stable and fine controlled amphoteric doping possible. P- and n-type doping was respectively achieved by encapsulation of molecules having large electron affinity and small ionization energy inside SWNT, resulting in a sufficient stability in air. Such a stable doping technique enables the control of carrier density in a very low-density level. From temperature and magnetic field dependence of resistance in carrier controlled SWNT film, the transport mechanism of SWNT is understood in terms of the variable-range-hopping model, as reported before, and experimental results are explained by variation of density of states, while the localization length remains almost unchanged. This doping technique is very useful not only in individual SWNT, but also in SWNT film.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARU15012T