Field emission from aligned carbon nanotubes prepared by thermal chemical vapor deposition of Fe-phthalocyanine

Araki, Hisashi; Katayama, Tetsutaroh; Yoshino, Katsumi
October 2001
Applied Physics Letters;10/15/2001, Vol. 79 Issue 16, p2636
Academic Journal
The field emission from aligned multiwalled carbon nanotubes prepared by thermal chemical vapor deposition of Fe-phthalocyanine is reported, with emphasis on the current–voltage characteristics and current fluctuation. By running of a pristine emitter at high current and/or voltage for a long time, the onset voltage is lowered from 400 to 125 V and the field-enhancement factor increases from 360 to 1110, demonstrating geometrical reconstruction of the nanotube apex. Deviation from the Fowler–Nordheim relation is caused at a constant local electric field of ∼4×10[sup 3] V/μm and is related to high-field conditioning. Electron emission current under a high current density condition (>10 mA/cm2) is stable and noiseless. The reason for current noise in the lower current density is discussed. © 2001 American Institute of Physics.


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