Multi-walled carbon nanotubes of 200 nm diameter and carbon micro-balloons

Abstract

The growth of multi-walled carbon nanotubes (MWNTs) with a large diameter of 200 nm on nickel (Ni) coated silicon wafer at different growth times up to 30 min was investigated. CNT cobwebs were found after a short growth time (7 min) and developed into ordered forests at higher growth times (t t 10 min). One of the important formation features of the CNTs in this study was the coaxial structure of the nanotubes, ie. a MWNT within a MWNT. Its formation was due to secondary nanostructures of Ni particles. Unexpected growth of carbon micro-balloons occurred when high flow rates of carbon feedstock was used or when growth time exceeded 15 min.

Enzymatic ‘stripping’ and degradation of PEGylated carbon nanotubes

“…Depending on the number of the graphene sheet layers the CNTs are composed of, CNTs are divided in to single wall (SWNTs) [29], double wall (DWNTs) [30][31][32][33], triple wall (TWNTs) [34][35][36][37] and multiwall (MWNTs) [38]. Concurrently, the diameter varies from 3 Å for SWNTs [39,40] up to 200 nm for MWNTs [41].…”