Electrical transport in small bundles of single-walled carbon nanotubes: intertube interaction and effects of tube deformation

TL;DR

This study investigates how intertube interactions and tube deformation affect electrical transport in small bundles of single-walled carbon nanotubes, revealing that structural factors significantly influence their electronic properties.

Contribution

The paper combines structural and electronic transport analysis with ab-initio simulations to demonstrate the impact of intertube interactions and deformation on nanotube bundle conductivity.

Findings

Tube deformation induces bandgap opening in metallic nanotubes.

Electrical transport depends on tube arrangement and orientation.

Intertube interactions significantly influence electronic behavior.

Abstract

We report a combined electronic transport and structural characterization study of small carbon nanotube bundles in field-effect transistors (FET). The atomic structures of the bundles are determined by electron diffraction using an observation window built in the FET. The single-walled nanotube bundles exhibit electrical transport characteristics sensitively dependent on the structure of individual tubes, their arrangements in the bundle, deformation due to intertube interaction, and the orientation with respect to the gate electric field. Our ab-initio simulation shows that tube deformation in the bundle induces a bandgap opening in a metallic tube. These results show the importance of intertube interaction in electrical transport of bundled nanotubes.