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Field Emission Properties of Vertically Aligned Carbon Nanotubes Driven by Polar and Non-Polar Gas Adsorption

Published online by Cambridge University Press:  15 March 2011

Youngsik Song ,
Brian Usner ,
Jaewu Choi ,
Seong-Chu Lim  and
Young Hee Lee
Youngsik Song
Affiliation:
Dept. of Electrical and Computer Engineering, Wayne State University, 5050 Anthony Wayne Dr. #3100, Detroit, MI 48202
Brian Usner
Affiliation:
Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Hwy, Baton Rouge, LA 70806
Jaewu Choi*
Affiliation:
Dept. of Electrical and Computer Engineering, Wayne State University, 5050 Anthony Wayne Dr. #3100, Detroit, MI 48202
Seong-Chu Lim
Affiliation:
Dept. of Physics, Center for Nanotubes and Nanostructured Composites, Institute of Basic Science, Sungkyunkwan University, Suwon, 440-746, Republic of Korea
Young Hee Lee
Affiliation:
Dept. of Physics, Center for Nanotubes and Nanostructured Composites, Institute of Basic Science, Sungkyunkwan University, Suwon, 440-746, Republic of Korea
*
*Corresponding author: [email protected]
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Abstract

We studied the gas adsorption effects on the field emission properties of vertically aligned multiwalled carbon nanotube films by exposing them to polar (H2O) and non-polar (N2O) gas molecules. The charge transfer between adsorbates and carbon nanotubes plays an important role in the field emission properties. With bias voltage ~ 1.2V/μm, the field emission properties of the carbon nanotubes are improved by exposing the nitrous oxide while the bias effect with water exposure is less significant. The improvement of the field emission properties by gas exposure is attributed not only to the change in the work function of the carbon nanotubes caused by a charge transfer, but also to the reactivity of the adsorbate gas with localized-cap states.

Type
Article
Information
MRS Online Proceedings Library (OPL) , Volume 706: Symposium Z – Making Functional Materials with Nanotubes , 2001 , Z5.8.1
Copyright
Copyright © Materials Research Society 2002

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