Transformation of the individual MWCNT’s structure under electron irradiation and annealing in inert atmosphere

Abstract

The structure and properties of individual MWCNTs subjected to electron irradiation and thermal annealing in an inert atmosphere of Ar have been investigated by means of transmission electron microscopy, Raman spectroscopy, and electrophysical methods. It is shown that electron irradiation generates point defects and it changes the interlayer distance in the MWCNTs` walls. Thermal annealing in an inert atmosphere leads to a partial restoration of the MWCNTs` structure. At the same time, the large-scale defects are observed in the nanotube walls, due to which the MWCNTs acquire a `zigzag` form. Consecutive ionic and thermal treatments determine the MWCNTs` electrophysical properties and could be used as a method for conductivity manipulation.