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Unusual transport characteristics of nitrogen-doped single-walled carbon nanotubes
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View: Figures


Image of FIG. 1.
FIG. 1.

Drain-source current versus gate voltage characteristics of the network transistor of N-SWCNTs in (a) ambient air and in (b) vacuum . The inset figures show the leakage currents vs curves in air and in vacuum, respectively.

Image of FIG. 2.
FIG. 2.

Geometries for the N-SWCNTs in (a) the graphitelike configuration and the pyridinelike configurations (b) with and (c) without passivating hydrogen atoms. Dark gray, blue, and white spheres stand for carbon, nitrogen, and hydrogen atoms, respectively. Relative energetics according to the formula described in the text is presented in eV unit. Shown geometries are optimized by the energy minimization calculations.

Image of FIG. 3.
FIG. 3.

Electronic structure of the (10,0) nanotubes (a) without any defect, (b) with one graphitelike N dopant, (c) with one pyridinelike N dopant and two passivating hydrogen atoms, and (d) with three neighbored pyridinelike N dopants. Solid red lines are DOSs for the carbon atom in the zigzag chain (20 C atoms) and the dotted green lines are those of nitrogen atoms. Two downward arrows in (a)–(d) indicate the position of the valence band and conduction band edges of the intrinsic carbon nanotube. Corresponding atomic geometries, which are the unit cell in the ab initio calculations, are shown right to the DOSs. In the atomic geometries nitrogen atoms are emphasized with blue circles. Upward thick arrow in the atomic geometry indicates the selected carbon zigzag chains for the partial DOS plot.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Unusual transport characteristics of nitrogen-doped single-walled carbon nanotubes