Firstly, I show the cutting of CNT.
A single CNT was cut in three times by the electron beam in the presence of oxygen gas.
An acceleration voltage of 1 kV was used.
The Electron Beam were used as point mode.
And the Oxygen gas flow rate was 1 sccm.
At the first time, the CNT has been cut off a length of 650 nm. And 700 nm at the second time.
The last image shows the cutting of the CNT such that it has the same length as the one on the left.
These experimental results demonstrate that the length of CNT can be precisely controlled by using an electron beam, assisted with oxygen gas.