Effects of Cs deposition on the field-emission properties of single-walled carbon-nanotube bundles

Wadhawan, A.; Stallcup, R. E.; Perez, J. M.
January 2001
Applied Physics Letters;1/1/2001, Vol. 78 Issue 1, p108
Academic Journal
We report the effects of Cs deposition on the field-emission (FE) properties of single-walled carbon-nanotube bundles. We observe that Cs deposition decreases the turn-on field for FE by a factor of 2.1-2.8 and increases the FE current by six orders of magnitude. After Cs deposition, the FE current versus voltage (I-V) curves show non-Fowler-Nordheim behavior at large currents, consistent with tunneling from adsorbate states. At lower currents, the ratio of the slope of the FE I-V curves before and after Cs deposition is approximately 2.1. Exposure to N[sub 2] does not decrease the FE current, while exposure to O[sub 2] decreases the FE current. © 2001 American Institute of Physics.


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