Highly unperturbed inner tubes in CVD grown double-wall carbon nanotubes

TL;DR

This paper reports the synthesis of double-wall carbon nanotubes with highly unperturbed inner shells using catalytic vapor deposition, demonstrating enhanced phonon lifetime and potential for advanced applications.

Contribution

It introduces a method to produce DWCNTs with unperturbed inner tubes, showing improved inner tube quality and stability compared to prior techniques.

Findings

Inner tubes exhibit enhanced phonon lifetime.

Outer tubes protect and stabilize the inner tubes.

Inner tubes are similar to those in peapod-grown DWCNTs.

Abstract

The synthesis of double-wall carbon nanotubes (DWCNTs) with highly unperturbed inner shells is reported using the catalytic vapor deposition method. Temperature dependent and high resolution Raman measurements show an enhanced phonon life-time of the inner tubes with respect to the outer ones and similar diameter SWCNTs. This proves that the inner tubes are unperturbed similar to the inner tubes in peapod-grown DWCNTs. The presence of the outer tube is argued to protect the inner tube from interaction with impurities and also to stabilize the growth of defect free inner tubes. The current material underlines the application potential of DWCNTs.