Controlled fabrication of single-walled carbon nanotube electrodes by   electron-beam-induced oxidation
  The fabrication of metallic single-walled carbon nanotube electrodes separated by gaps of typically 20nm width by electron-beam-induced oxidation is studied within an active device configuration. The tube conductance is measured continuously during the process. The experiment provides a statistical evaluation of gap sizes as well as the electron dose needed for gap formation. Also, the ability to precisely cut many carbon nanotubes in parallel is demonstrated. 
Cornelius Thiele, Michael Engel, Frank Hennrich, Manfred M. Kappes,   Klaus-Peter Johnsen, Carl G. Frase, Hilbert v. L\"ohne...
cond-mat.mes-hall