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Title: Enhanced electron emission from tetrahedral amorphous carbon capped carbon nanotube core-shelled structure
Authors: Yu, J.
Anetab, P.
Koh, A.T.T.
Chua, D.H.C. 
Wei, J.
Keywords: Carbon nanotubes
Electron emission
Issue Date: Jan-2012
Source: Yu, J., Anetab, P., Koh, A.T.T., Chua, D.H.C., Wei, J. (2012-01). Enhanced electron emission from tetrahedral amorphous carbon capped carbon nanotube core-shelled structure. Diamond and Related Materials 21 : 37-41. ScholarBank@NUS Repository.
Abstract: Core-shelled composites have been shown to enhance material properties, notably for chemical sensing and biomolecular applications. In this comprehensive study, we show that a simple core-shell structure, made up of tetrahedral amorphous carbon (ta-C) tip-capped onto an aligned dense array of carbon nanotubes (CNT), exhibits superior electron emission properties, having a distinct enhancement in the turn-on field of < 1 V/μm without any lithography patterning. This is compared to ~ 2 V/μm for pristine CNT samples. A KrF pulsed laser deposition process was used to deposit high (> 70%) sp 3 content non-hydrogenated ta-C films of varying thickness for the tip-capping process. Combining scanning electron microscopy images and electron emission testing results, our systematic study shows that first, the thickness of the ta-C can range from 20 to 100 nm and is sufficient to achieve the enhancement effect. However, thicker coatings > 200 nm will degrade the electron emission. Second, a simple tip-capping is sufficient to achieve the enhancement without the need to encapsulate the entire carbon nanotube. © 2011 Elsevier B.V. All rights reserved.
Source Title: Diamond and Related Materials
ISSN: 09259635
DOI: 10.1016/j.diamond.2011.10.006
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