Enormous shrinkage of carbon nanotubes by supersonic stress and low-acceleration electron beam irradiation
(Color online) Schematic of electron shower irradiation of a carbon nanotube under supersonic vibration. A typical SWNT had a diameter of 2 nm and length of 1 μm, and the MWNT had a thickness of about 10 nm and a length of 1 μm.
Sequential snapshot during shrinkage of a SWNT bundle; (a) initial SWNT, and SEM image of a SWNT after being irradiated with electron doses of (b) 0.2 C/cm2, (c) 0.5 C/cm2, and (d) 1.0 C/cm2.
Shrinkage of CNT under electron irradiation at 5 keV, and typical SEM images of carbon nanotubes before and after electron irradiation.
Highly sensitive dependence of shrinkage rate of CNT upon the applied supersonic frequency.
(Color online) Shrinkage rate dependency upon electron dose. Reducing the electron energy drastically increased the shrinkage rate, as indicated by the slope.
Shrinkage rate dependency of CNT upon the irradiated electron energy. The error in the data at 1 keV was widely distributed because of severe carbon contamination, but the maximum shrinkage rate was obtained.
TEM images of (a) initial SWNT bundle, (b) shrunken SWNT bundle by 1 keV electron irradiation, (c) initial MWNT, and (d) shrunken MWNT by 1 keV electron irradiation. The arrows suggest the positions of periodic blur in (b) and solid lines in (d) are guides of the zigzag folding in MWNT.
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