DOI: 10.1063/1.1314874. Effect of work function and surface microstructure on field emission of tetrahedral amorphous carbon

Effect of work function and surface microstructure on field emission of tetrahedral amorphous carbon

10.1063/1.1314874

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

The work function of tetrahedral amorphous carbon (ta-C) has been measured by Kelvin probe to lie in the range 4–5 eV, irrespective of its sp3 content or nitrogen addition. This implies that the surface barrier to emission is dominant and that emission changes caused by sp3 bonding or nitrogen addition are not directly due to changes in work function. Hydrogen, oxygen, and argon plasma treatments are all found to increase the emission of a-C, but hydrogen and argon treatments are found to reduce the work function while oxygen treatment increases it. Detailed studies of the surface with varying plasma treatment conditions suggest that the changes in emission arise mainly from changes in the surface microstructure, such as the formation of sp2 regions within the sp3 bulk. The need for local field enhancement mechanisms to account for emission over the sizeable barrier is emphasized, which may arise from local chemical nonhomogeneity, or formation of nanometer-size sp2 clusters embedded in an sp3 matrix.

Bibliography

Ilie, A., Hart, A., Flewitt, A. J., Robertson, J., & Milne, W. I. (2000). Effect of work function and surface microstructure on field emission of tetrahedral amorphous carbon. Journal of Applied Physics, 88(10), 6002â6010.

Authors 5

A. Ilie (first)
A. Hart (additional)
A. J. Flewitt (additional)
J. Robertson (additional)
W. I. Milne (additional)

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Dates

Type	When
Created	23 years ago (July 26, 2002, 8:41 a.m.)
Deposited	1 year, 6 months ago (Feb. 6, 2024, 11:47 p.m.)
Indexed	1 year ago (Aug. 22, 2024, 2:13 p.m.)
Issued	24 years, 9 months ago (Nov. 15, 2000)
Published	24 years, 9 months ago (Nov. 15, 2000)
Published Print	24 years, 9 months ago (Nov. 15, 2000)

Funders 0

None

BibTeX

@article{Ilie_2000, title={Effect of work function and surface microstructure on field emission of tetrahedral amorphous carbon}, volume={88}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.1314874}, DOI={10.1063/1.1314874}, number={10}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Ilie, A. and Hart, A. and Flewitt, A. J. and Robertson, J. and Milne, W. I.}, year={2000}, month=nov, pages={6002–6010} }

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