Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.apsusc.2012.10.108
Title: Triple layered core-shell structure with surface fluorinated ZnO-carbon nanotube composites and its electron emission properties
Authors: Wang, H.Y.
Chua, D.H.C. 
Keywords: Carbon nanotubes
Fluorine
Plasma immersion
ZnO
Issue Date: 15-Jan-2013
Citation: Wang, H.Y., Chua, D.H.C. (2013-01-15). Triple layered core-shell structure with surface fluorinated ZnO-carbon nanotube composites and its electron emission properties. Applied Surface Science 265 : 66-70. ScholarBank@NUS Repository. https://doi.org/10.1016/j.apsusc.2012.10.108
Abstract: Core-shelled structures such as zinc oxide (ZnO) on carbon nanotubes (CNTs) give rise to interesting material properties. In this work, a triple-layered core-shell-shell structure is presented where the effects of fluorine (F) incorporation on the outmost shell of the ZnO-CNT structure are studied. The samples prepared ranged from a short 2 min to a 30 min immersion in carbon tetraflouride (CF4) plasma. In addition, its effects on the electron emission properties also studied and it is shown that the plasma immersions create thinner field emitters with sharp tiny wrinkles giving rise to more electron emission sites and higher enhancement factor. In addition, X-ray photoelectron spectroscopy measurements showed that F ions replace O in ZnO coatings during immersion process, thus increasing the electrical conductivity and shifts the Fermi level of ZnO upwards. Both physical and electronic effects further contribute to a lower threshold field. © 2012 Elsevier B.V. All rights reserved.
Source Title: Applied Surface Science
URI: http://scholarbank.nus.edu.sg/handle/10635/86819
ISSN: 01694332
DOI: 10.1016/j.apsusc.2012.10.108
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