Irradiation induced vacancy creation in single walled carbon nanotubes

TL;DR

This study investigates how irradiation with cesium ions causes vacancy creation and structural damage in single-walled carbon nanotubes, using sputtering analysis and electrical conductivity measurements.

Contribution

It provides new insights into vacancy formation and structural changes in carbon nanotubes under ion irradiation through combined sputtering and conductivity analysis.

Findings

Increased vacancy creation with higher Cs dose and energy.

Correlation between sputtered species and structural damage.

Changes in electrical conductivity indicating structural transformations.

Abstract

Single walled carbon nanotubes of 2 nm diameter and 3 to 13 micro meter length were compressed in Cu bullets and irradiated with positive ions of Cs with energies from 0.2 to 2.0 keV and subjected to successively increasing Cs dose. From the mass spectra of the sputtered carbon atoms and clusters as a function of Cs energy the monitoring of trend of the relative number densities of the fragmenting species indicates the accumulating damage. Irradiation induced fragmentation provide clues to the structural changes as a result of creation of vacancies due to the sputtering of monatomic, diatomic, triatomic and higher species. Monitoring of the the irradiated target electrical conductivity provides information of the sequences of the transformation that may be occurring in the structures of the single walled carbon nanotube as a function of Cs energy and dose.